Free SEO Tools

The 17 free tools in the Next-Gen AI SEO & GEO category break one question into measurable parts: can generative answer engines — ChatGPT, Google AI Overviews, Perplexity, Copilot — reach your page, parse it into something they understand, and judge it worth citing when they answer? Classic SEO tools ask where Google ranks you. This category asks whether an AI system will put you inside its sentence. They are not the same question, and a page can be strong on one and invisible on the other.

Why this became its own category

The results page quietly changed hands over the last two years. Someone types a question, gets a generated paragraph at the top of the page, and often never touches the ten blue links underneath. The same behaviour moved into chat interfaces: people no longer search "best accounting software", they ask, and the model returns an answer stitched from two or three sources. In that arrangement the thing that drives traffic is not only your rank but your citability. If a model never quotes you and your brand never appears in the answer, ranking first buys you nothing in that session.

The tools here measure that new surface in three layers — access, format and trust — because a page that fails any one of them cannot enter an AI answer. The concepts are covered in full in the free AI SEO tools section above; the list below is the practical map of which tool answers which question.

Which tool answers which question

• Overall visibility and readiness. AI Visibility Checker rolls every signal — AI crawler access, brand-entity strength, structured data, citable content, llms.txt — into one score out of 100. GEO Checker grades the same fundamentals from a generative-engine angle, and AEO Checker grades the answer-engine format: question headings, self-contained short answers, lists, tables, FAQ schema. If you do not know where to start, run these three in that order.
• Citability. AI Citation Checker measures how quote-worthy a page looks: does it answer directly, does it carry numbers, does it cite sources, is there a named author and a date. AI Snippet Optimizer finds the most quotable 40–60 word block on the page and rewrites a tighter version of it.
• Machine readability. LLM Readability Score scores how cleanly a language model can parse your text, using sentence length, passage size, jargon and ambiguity. Passage Optimization Checker does the same paragraph by paragraph — Google and AI engines both judge pages passage by passage, not as one block. AI Prompt-Friendly Content Checker compares your content against the way people actually phrase things in a chat box.
• Question coverage. FAQ Gap Finder pulls the questions people really ask about your topic and lists the ones your page does not answer; AI FAQ Optimizer grades the answers you already have for snippet-readiness and generates copy-paste FAQPage JSON-LD.
• Meaning and entities. Models match concepts, not strings. Entity Extractor lists the people, organizations, places and concepts on your page; Entity Coverage Analyzer tells you which of the entities the topic expects are missing; Semantic Coverage Analyzer does the same at the level of subtopics and related terms; and NLP Content Analyzer shows your text the way a natural-language engine sees it — salient terms, sentiment, sentence structure.
• Authority and trust. Topical Authority Map works out how completely your whole site covers a topic and returns the missing subtopics — cluster level, not single-article level. E-E-A-T Analyzer audits experience, expertise, authoritativeness and trust signals one by one. AI Content Score compresses all of it into a single 0–100 grade, which is the most practical one to track over time.

A twenty-minute AI visibility pass

1. Run AI Visibility Checker on your homepage and fix any "crawler blocked" warning immediately. If GPTBot or PerplexityBot is shut out, everything else is theoretical.
2. Run AI Citation Checker and AEO Checker on the article that actually brings you traffic; the "no source, no date, no author" items are the fastest wins on the list.
3. On the same page, use Passage Optimization Checker to find the weakest paragraphs and AI Snippet Optimizer to cut the opening answer to 40–60 words.
4. Add the missing questions FAQ Gap Finder surfaces, then generate the markup with AI FAQ Optimizer.
5. Once a month, run Topical Authority Map and build next month's content plan out of the gaps it returns.

The four mistakes this category catches most often

• Blocking answer engines while trying to block scrapers. A blanket disallow in robots.txt shuts out GPTBot and PerplexityBot along with everything else. Deciding that deliberately is one thing; going invisible without noticing is another. Robots.txt Tester shows exactly who is let in.
• Burying the answer. A long intro, three paragraphs of context and the actual answer somewhere in the middle is the standard blog shape, and it is the worst possible one for an answer engine. Give the answer in two or three sentences directly under the heading; the detail still follows.
• Writing in one enormous block. Models quote passages, not pages. An unbroken 900-word block is not citable even when a perfect answer is buried inside it, because there is no clean boundary for the model to lift.
• Never naming the brand. A page written entirely in "we" and "our team" leaves the model no entity to attach anything to. Say the brand name, what it does and where it operates in the copy, and repeat the same facts in structured data for the machine side.

Those four are what the tools in this category flag most often, and none of them costs money to fix — they are a change of publishing habit. For a small blog, AI Citation Checker and AEO Checker alone are enough to start with; on e-commerce and corporate sites Entity Coverage Analyzer and E-E-A-T Analyzer matter most; and for a publication trying to own a subject long-term, Topical Authority Map returns the most.

What these tools do not do

The honest limit: they do not query ChatGPT on your behalf and count how many times it named you. What they do is measure, on your own page, the signals answer engines weigh when they choose a source, and hand the shortfalls back as fixable items. If you want to track brand mentions themselves, that is a job for Brand Monitoring plus referral traffic in Search Console and analytics. The two halves work together: you fix the signals here and measure the outcome there.

There is also a timing argument. AI answer surfaces are still new enough that the pages explaining and targeting them are thin in most niches, and the competition for "cited by AI" is nothing like the competition for a head term. Making your pages quotable now is far cheaper than doing the same work in a crowded field two years from now. Start with what GEO is, GEO vs AEO vs LLMO, how to get cited by ChatGPT and managing AI crawlers in robots.txt.

The 21 free tools in the Site & On-Page Analysis category do one job: they open a page the way Google first sees it — as the HTML the server returns — and measure the on-page elements that decide how it ranks: title tag, meta description, H1–H6 structure, keyword alignment, internal and external links, image ALT text, mobile setup, speed, structured data and content depth. If you are asking which category to run first, this is it. On-page is the only part of SEO you can fix for free, today, and see move within weeks. Earning links takes months and building authority takes years; fixing a missing title tag takes five minutes.

What on-page analysis actually measures

A search engine judges a page with three questions: can I reach it, can I tell what it is about, is it worth showing. On-page analysis is the part of all three that sits under your control. You cannot change how many links a competitor has, but you can change which query your page answers, where that answer sits, how the headings are ordered and how many seconds the page takes to render.

In practice, what holds most sites back is not an exotic technical fault but three or four ordinary gaps from this list: a meta description inherited from the theme and repeated on every page, images with no ALT text, three H1s instead of one, a product page that takes four seconds on mobile, two category pages written around the same phrase. These tools find those gaps by measuring rather than guessing. For the conceptual background see the tool categories section above, and for the running order see the 30-minute free audit steps.

Which tool answers which question

• Everything in one pass. All-in-One SEO Audit runs every check in this category against one URL in a single crawl and returns an overall score, a prioritized fix list and an exportable report. If you do not know where to start, start here. On-Page SEO Audit does the same job in a narrower frame — one page's on-page health — while Technical Site Audit (Crawler) walks the site instead of a single page and collects broken links, missing titles, thin pages, redirects and noindex.
• Target keyword alignment. On-Page SEO Checker (Keyword) grades how well a page is optimized for one specific term: is it in the title, the H1, the URL, the opening paragraph. Keyword Density Checker shows how often you repeat it — the fastest way to see whether you have drifted into stuffing.
• Titles, meta and SERP appearance. Meta Tag Analyzer pulls the title, description, robots, canonical and social tags from the live page and scores them with their lengths. Heading Structure Analyzer visualizes the H1–H6 hierarchy and surfaces missing H1s, skipped levels and duplicate H1s. Open Graph & Twitter Card Checker previews how the page looks when someone shares it on LinkedIn, X or a messaging app.
• Links. Link Analyzer counts internal and external links and the nofollow ratio; Broken Link Checker calls each one and reports the dead ones (4xx/5xx) and the redirects. Anchor Text Optimizer classifies your anchors and flags the "click here" kind, and Internal Link Opportunity Finder surfaces related pages that do not link to each other yet — one of the highest-return free jobs on any site.
• Images, mobile and speed. Image ALT Text Checker lists every image missing descriptive ALT text. Mobile-Friendly Checker verifies the viewport and responsive signals, and Page Speed & Size Test measures real server response time (TTFB), total page weight and compression.
• Content quality and trust. Thin Content Checker tells you whether a page reads as empty to a search engine, using word count, text-to-HTML ratio and vocabulary variety. Content Freshness Score grades how current it looks. Keyword Cannibalization Checker puts your own competing pages side by side. Author Page Audit audits author pages for the E-E-A-T signals Google and AI systems look for.
• The machine side. Structured Data (Schema) Checker detects the JSON-LD and Microdata types on the page — the reason a page never earns rich results usually shows up here. GEO & AEO Readiness Checker grades the same page for AI search readiness, and is the bridge between this category and the AI category above.

A twenty-minute on-page pass

1. Run All-in-One SEO Audit on the page that actually brings you traffic and keep the prioritized fix list it returns. Every step below deepens one part of it.
2. Put that page's target keyword into On-Page SEO Checker (Keyword). If the term is missing from the title or the H1, that is the fastest win you will find all day.
3. Fix lengths with Meta Tag Analyzer and the heading order with Heading Structure Analyzer.
4. Run Broken Link Checker and Image ALT Text Checker; both produce mechanical, uncontroversial fixes.
5. Measure the mobile side with Page Speed & Size Test and Mobile-Friendly Checker — nearly always, most of the page weight is uncompressed images.
6. Once a month, crawl the whole site with Technical Site Audit (Crawler) and clear out self-competing pages with Keyword Cannibalization Checker.

The five mistakes this category catches most often

• One template description on every page. Most CMS themes fill the description field with a single site-wide sentence, so hundreds of pages share it and Google uses none of them. Technical Site Audit (Crawler) catches it site-wide; writing meta descriptions covers what to replace it with.
• A title that describes the site, not the page. "Home | Company Name" tells a searcher nothing and wastes the single strongest on-page signal you have. See title tag optimization.
• Heading tags used for size. H2 chosen because it looked right, H1 skipped entirely, three H1s on one page. Headings are an outline, not a font control — Heading Structure Analyzer shows the real shape, and the H1–H6 guide explains the order.
• Two pages chasing the same query. A category page and a "best X" list built around the same phrase leave both stuck mid-page. Keyword Cannibalization Checker shows the pair; the call — merge, differentiate or canonicalize — is yours.
• A heavyweight hero image. Uploading a 3000px product photo costs nothing on desktop and seconds on a mobile connection. Page Speed & Size Test gives you the real weight; the Core Web Vitals guide explains which metric it hurts.

None of the five costs money to fix — they are publishing habits. On a small business site, All-in-One SEO Audit plus Meta Tag Analyzer is enough to start with; on e-commerce, Keyword Cannibalization Checker, Image ALT Text Checker and Page Speed & Size Test matter most; on blogs and publications, Thin Content Checker, Content Freshness Score and Author Page Audit are the three that return the most.

What these tools do not do

The honest limit: these tools read the HTML your server returns. Content that only appears after JavaScript runs is invisible to them — which is close to what a crawler sees on its first pass, so "the tool could not see it" is usually a real warning rather than a false negative. None of them gives you a ranking either: an on-page score is a list of fixable gaps, not a rank prediction. For position, use Keyword Rank Checker; for real clicks and impressions, use Search Console.

And a single run is a snapshot. The value of on-page work comes from repetition — running the same audit monthly and watching the direction of the score beats one perfect audit. For the theory, read the on-page SEO guide; for a checklist, how to run an on-page SEO audit; and for links between your own pages, internal linking strategy.

The 13 free tools in the Keyword & Content Research category answer the question that comes before you write anything: what are people actually searching for on this topic, what do they want when they search it, and which page should exist to satisfy that? On-page analysis improves the page you already have. This category decides which page to write. The most expensive mistake in SEO is not a badly optimized article — it is a technically flawless article written for a phrase nobody searches, or one you were never going to win.

How to do keyword research without search volume

What paid platforms really sell is one number: monthly search volume. That number is itself an estimate — modelled from clickstream data, rounded to a month, and frequently different in two different tools. The tools here skip buying that number and go to a more direct source: the search engines' own autocomplete. Every phrase that appears in a suggestion list is there because real people typed it often enough to earn a slot. So without a volume figure you still get an answer to the question that matters when planning content: does this query exist, and in these words?

That is also why this approach travels well outside English. Global volume databases return "0" or "no data" for a large share of long-tail queries in smaller-language markets even when those queries run into the hundreds a month; live autocomplete never has that blind spot, because it is fed by what users type. The method is covered in full in the low-competition long-tail section above; the list below maps tool to question.

Which tool answers which question

• Finding and expanding ideas. Keyword Research is the flagship: it expands one seed into hundreds of live queries from Google, YouTube, Bing and DuckDuckGo autocomplete, scores each phrase for demand, difficulty and opportunity, labels intent and funnel stage, and groups the result into topic clusters. For a faster, narrower list, Keyword Suggestion Tool returns the same source plainly with A–Z and question modifiers. Topic Research & Content Ideas returns the output as headlines you can drop straight into a content calendar — questions, comparisons, preposition variants — rather than as a keyword list.
• Intent: what should I write for this phrase? Writing without knowing whether a query wants a guide, a product page or a comparison is the single most common reason a good page fails to rank. Search Intent Analysis classifies one keyword as Informational, Navigational, Commercial or Transactional. Search Intent Analyzer goes deeper: primary and secondary intent, funnel stage, recommended content type, and the SERP features the query is likely to trigger. Keyword Intent Classifier does the whole list in one pass — the biggest time-saver when you are prioritizing hundreds of phrases.
• Structure: how many pages is this? A list of fifty keywords is not fifty articles. Most of them belong to the same page, and splitting them produces keyword cannibalization. Semantic Keyword Cluster groups the expanded list by shared terms, labels each cluster's intent and lays out a pillar-and-spoke architecture. If you intend to own a topic rather than publish one post about it, your plan comes from here.
• Competition and gaps. Content / Keyword Gap puts your page next to a competitor's and lists the terms they cover and you never mention — the fastest way to strengthen an existing article without rewriting it. SERP Features Analyzer predicts whether a query triggers a featured snippet, People Also Ask, video or a local pack, which decides the format of the page. PPC & Keyword Value Research estimates commercial value and competition — useful on the organic side too, because a keyword advertisers pay for is a keyword with buying intent behind it.
• Pre-publish checks. Google SERP Snippet Preview shows pixel-accurately how your title and description will render in results. Word & Character Counter gives word, sentence, paragraph and reading-time counts plus your most frequent terms. Text Similarity / Duplicate Checker compares two texts and returns a real similarity percentage — essential for product pages reusing supplier copy and for category descriptions that drift into near-duplicates.

A twenty-minute keyword pass

1. Put the broadest version of your topic into Keyword Research as the seed, set language and market, and sort the result by opportunity score.
2. Paste the list into Keyword Intent Classifier and split it into two buckets: informational phrases for articles, commercial and transactional ones for service or product pages.
3. Run Semantic Keyword Cluster to get the clusters. Each cluster is one page: its broadest phrase is the target keyword, the rest are subheadings.
4. Check the first page you plan to write with Search Intent Analyzer and SERP Features Analyzer, and set the page type and format (list, table, FAQ) accordingly.
5. Run Content / Keyword Gap against a competitor already ranking for the topic and add the missing terms to your outline.
6. Just before publishing, verify the title with Google SERP Snippet Preview and originality with Text Similarity / Duplicate Checker. After publishing, measure the page against its target phrase with On-Page SEO Checker.

Five mistakes that show up again and again

• Discarding anything that shows zero volume. A large share of long-tail queries read as zero in global databases. A phrase that appears in autocomplete should not be dismissed because its volume is unmeasurable — very often it is your best-converting page. See long-tail keywords for the full argument.
• Treating variants as separate keywords. "running shoes for flat feet", "best running shoes flat feet" and "flat feet running shoe reviews" look like three rows but represent one intent and belong on one page. Semantic Keyword Cluster merges them; if you do not merge them, you publish three weak pages instead of one strong one.
• Translating research between markets. Phrasing does not survive translation — people in different markets ask for the same product in structurally different words. Always seed in the target language, in the way people actually speak it.
• Choosing a keyword without looking at the SERP. A phrase can look attractive while its first page is wall-to-wall marketplaces, aggregators or forums, in which case a new site is not getting in. SERP Features Analyzer shows which format is rewarded; look at the actual results before you commit.
• Misreading intent and building the wrong page type. Writing a guide for queries containing "price", "pricing" or "reviews"; serving a product page to a "how to" query. However good the content is, the wrong page type does not rank. Search intent explained walks through the distinctions.

None of the five is about budget — they are about sequence. Research done before writing is free; done afterwards it costs a rewrite. On a small blog, Keyword Research and Topic Research & Content Ideas are enough to start with; on e-commerce, Keyword Intent Classifier, PPC & Keyword Value Research and Text Similarity / Duplicate Checker matter most; and for publications intending to own a topic, Semantic Keyword Cluster plus Content / Keyword Gap is the pair that returns the most.

What these tools do not do

The honest limit: this category does not give you exact monthly search volume from Google Ads. The demand, difficulty and opportunity scores are relative measures computed from suggestion rank, query length, competition signals and SERP structure — enough to say "A is searched more than B", not enough to say "this gets exactly 2,400 searches a month". Tools whose numbers are modelled are labelled as estimates on their own cards. Exact volume has one source: Keyword Planner inside a Google Ads account that is actually spending.

Second limit: there is no historical ranking index here showing which keywords a competitor gets traffic from — Content / Keyword Gap reads a competitor's page live, not their archive. For position itself use Keyword Rank Checker, and for real clicks and impressions use Search Console — which is, in the end, the single best keyword source you have: the queries your site is already being shown for. For the theory, read the keyword research guide; for architecture, topic clusters and pillar pages; for growing pages you already have, content refresh strategy and winning featured snippets.

The 8 free tools in the Competitor & Backlink Analysis category do not look at your site — they look at everything around it: what a rival is built on, which pages carry their traffic, who they link to, who links to you, and where a domain sits in the link graph. On-page analysis answers "is my page built correctly". This category answers "can I realistically compete for this query, and if not, what am I missing". When two technically flawless pages target the same keyword and one ranks first while the other sits on page four, the difference is almost always something measured here.

How far can free backlink analysis actually go?

Start with the honest answer, because this is the category where marketing language is thickest. What makes a paid platform's backlink report possible is not a clever tool but an infrastructure: their own crawlers running continuously across the web, and a link index built up over years. Paying for that index is the real reason those subscriptions cost what they cost. A free tool cannot replicate it, and any free tool claiming it can is not telling you the truth.

What it can do is take a different route, and in practice that route is more useful than it sounds: verify live instead of reading from an index. The most certain way to know whether a link exists is to open that page right now and look for it in the HTML — not to consult a snapshot taken a month ago. The same logic applies on the competitor side: a site's sitemap already is the list of pages it cares about, its HTML already says which keyword each page targets, and its outbound links already show who it associates with. As for your own backlink index, Google gives it to you free: export the Links report from Search Console, paste it into the tools here, and you are working with better data than a paid index could sell you, because that list is the one Google itself sees. The longer version of this argument is in the free alternative to Ahrefs and Semrush section above.

Which tool answers which question

• Who is this competitor and what are they running? Site Explorer profiles a domain end to end: CMS and theme, plugins, JavaScript libraries, CDN, hosting, analytics and ad tags, security headers, SSL, DNS, IP, country and on-page SEO signals. It is the fastest way to understand how a rival site is put together — useful when scoping a pitch, and just as useful when choosing your own stack. More: the free site explorer guide.
• Which pages are winning for them? Organic Research / Top Pages pulls a competitor's most important pages from their sitemap and analyses the topics and keywords those pages target. This is where you read their content strategy instead of guessing at it: how many pages they gave each topic, which title pattern they repeat, where they went deep. See also how to find what keywords a site ranks for.
• How much authority do they have? DA / PA Checker returns Domain and Page Authority from real link-graph data and compares up to twenty domains side by side. The point is not to look up one site — it is to rank the list: paste the ten domains on page one along with your own and see where you stand in a single view.
• Does this link actually exist? Backlink Checker / Verifier opens every URL on your list and reports whether it really links to you, plus the anchor text, the rel value (nofollow/sponsored/ugc) and the page's status code. Anyone who buys links, commissions sponsored posts or runs press releases should run this first: a surprising share of links reported as "published" were never placed, are nofollow, or quietly disappeared a few months later. Walkthrough: how to check backlinks for free.
• Are these links hurting me? Toxic Backlink Audit takes the list you exported from Search Console and scores each link against toxicity signals: suspect TLDs, link farms, mismatched language and topic, over-optimised exact-match anchors. Read the output as a review queue, not an execution list — a disavow file is never something to rush: toxic backlinks and disavow.
• Who links to them but not to me? Link Intersect / Backlink Gap compares the outbound link profiles of two competitor pages and returns the domains that link to both — which makes them realistic targets for you too. Starting an outreach list here rather than from guesswork is one of the highest-return things you can do for free: backlink analysis and link building.
• Where do I currently stand? Keyword Rank Checker estimates a domain's position for a keyword from on-page relevance signals. Its card says estimate for a reason; read it alongside the average-position data in Search Console: free rank tracking guide.
• Is this market worth entering? Market / Niche Explorer maps a niche: it aggregates demand signals, surfaces competitor angles and shows how crowded the topic already is. Run it before launching a new site, a new category or a new service line.

A twenty-minute competitor pass

1. Search your target keyword and copy the domains on page one. Paste them all into DA / PA Checker with your own domain in the list. The gap is your first estimate of how much content and link work stands between you and that page.
2. Pick the two rivals closest to your size and run Site Explorer on each. Note the differences in stack and technical signals.
3. Run Organic Research / Top Pages on the same two and list the topics you have never covered. That list is the skeleton of your next quarter's content plan.
4. Compare their two strongest pages in Link Intersect / Backlink Gap and pull the domains linking to both. That is your outreach shortlist.
5. Search Console → Links → export. Paste it into Toxic Backlink Audit and review anything flagged high-risk; historic paid links show up here.
6. Check every link you were told you received but never verified with Backlink Checker / Verifier in one batch.

The five mistakes this category catches most often

• Treating marketplaces and giants as your competitors. If page one is Amazon, Etsy, Reddit and Wikipedia, those are not your rivals — matching them takes years. Your real competitor is the independent site at your own scale that also appears there. Strip the giants out of the DA / PA Checker list and look at what remains; that is your realistic target.
• Buying links in bulk. Cheap packages of hundreds of links come from near-identical weak sites and most vanish within months. The benefit is short-lived and the risk is permanent. The same budget spent earning one genuine industry mention is measurably worth more — and methods like broken link building do it for nothing but time.
• Leaving paid placements unmarked. Sponsored posts without rel="sponsored" put both sides at risk. Backlink Checker / Verifier shows the rel value on every link; knowing how the content you paid for was marked up is your responsibility, not the publisher's.
• Reading DA as a Google metric. Domain Authority is a third-party estimate, not a value Google uses. It is excellent for comparison and meaningless as a target. A strategy built around "let's reach DA 40" optimises a tool's score rather than your rankings.
• Earning links once and never checking again. Links rot: pages get deleted, sites shut down, redesigns drop the link, an editor adds nofollow. Refreshing the list with Backlink Checker / Verifier twice a year is cheaper than chasing new links, and often more effective.

Scale matters in this category. For a small blog, Organic Research / Top Pages and Link Intersect / Backlink Gap are enough to start with. In e-commerce, Site Explorer and Market / Niche Explorer matter more, because the real decision is which category to compete in at all. For agencies and corporate sites the trio of DA / PA Checker, Backlink Checker / Verifier and Toxic Backlink Audit — reportable, verified link data — does the most work.

What these tools do not do

The honest limit: there is no box here where you type a domain and get "list all of its backlinks", because that list can only come from owning a web-scale crawl index. The tools here verify the list you supply, read live pages, or use public authority data. The consequence cuts both ways: you cannot see a competitor's full link profile, but you can see your own more accurately than a paid tool would show it, because Search Console data comes straight from Google with no modelling in between.

The second limit is rankings and traffic numbers. No free tool knows a competitor's monthly organic traffic — and the paid tools that claim to are modelling it, which is why two of them can differ several-fold on the same site. Keyword Rank Checker and Market / Niche Explorer are labelled as estimates for that reason; use both for comparison, never as absolute figures. For the whole subject see the competitor analysis guide, for link strategy backlink analysis and link building, for clean-up toxic backlinks and disavow, and for the on-site side internal linking strategy.

The 10 free tools in the Domain & Technical category do not interpret anything — they read records: who a domain is registered to, where it resolves, whether the certificate is valid, what the server actually sends back, which bot is allowed where, and whether the sitemap really works. No scores, no estimates, no "could be improved" — just a live query and a raw response. When you need to know why something is not happening, this is the first place to look.

Why technical lookups come first

Before a search engine can rank a page it does three things in order: resolve the domain, fetch the page, index the content. Break any link in that chain and everything downstream is wasted work. A perfect title tag does not compensate for a wrong DNS record; flawless content does not get past a header that says noindex. Content and link work take months and compound slowly; fixing a fault in this category usually takes five minutes and shows up on the next crawl.

In practice these tools get used at two different moments. The first is the routine check: taking over a new site, finishing a migration, or confirming everything is in place after a launch. The second is diagnosis — finding the cause behind "my page will not index", "the site is intermittently down", "email is not arriving", "Google is showing an old version". In the second case order matters, and the pass below follows exactly that order. For the conceptual introduction, see the free WHOIS, DNS, SSL and header lookups section above.

Which tool answers which question

• Who owns the domain, and until when? WHOIS Lookup returns the registrar, creation and expiry dates, name servers and status. Domain Age Checker derives the age from the same record — history is the signal people weigh most when buying an aged domain. A domain that lapses because nobody watched the expiry date is the most expensive accident a site can have; that alone is reason to put the date in a calendar. More: the WHOIS lookup guide.
• Where does it resolve? DNS Records Lookup shows A, AAAA, CNAME, MX, TXT, NS and SOA records as they stand right now. It is how you confirm a migration has propagated, that SPF and DKIM are in place, and that a verification TXT record is still there. IP & Geolocation Lookup opens up the server behind the address: country, ISP, ASN and hosting company. Background: DNS records explained.
• Is the certificate sound? SSL Certificate Checker lists the issuer, validity dates, days remaining and the domains the certificate covers. The two most common findings are a certificate that does not cover the www variant and a Let's Encrypt setup whose auto-renewal quietly broke. For the full move to HTTPS: the HTTPS migration guide.
• What is the server really sending? HTTP Header Checker shows raw response headers: status code, server software, cache directives, content type, security headers and — critically — X-Robots-Tag. A meaningful share of "there is no noindex on my page but Google will not index it" cases are solved not in the HTML but exactly here: noindex vs nofollow vs disallow.
• How many hops? Redirect & HTTP Status Checker traces the full chain step by step. You are looking for three things: 302s that should have been permanent, chains stretched over three or four hops when one would do, and loops. It is the single most useful tool after a migration: 301 vs 302 redirects.
• Where can bots go? Robots.txt Tester fetches the file, lists the rules per user-agent and finds the sitemap declarations. Not only for Googlebot: this is also where you see the status of AI crawlers such as GPTBot and PerplexityBot. Guides: the robots.txt guide and managing AI crawlers.
• Does the sitemap work? Sitemap Finder & Validator locates a domain's XML sitemaps, validates the format and counts the URLs inside. The two failures plugin-generated sitemaps hit most often are URLs left on an old domain after a migration and a lastmod value that never updates: the XML sitemap guide.
• Is the response compressed? Gzip / Brotli Compression Test measures whether text responses are actually compressed and how many bytes that saves. When it is off, the saving is usually above seventy percent and the fix is one line of server config — the cheapest mobile speed win there is: page speed optimization.

A ten-minute technical health pass

1. Check the expiry date with WHOIS Lookup and put it in a calendar. Once a year, and the most expensive step to skip.
2. Confirm with DNS Records Lookup that A and MX point at the servers you expect, and clear out stale verification TXT records while you are there.
3. Look at days remaining in SSL Certificate Checker. Under thirty, verify that auto-renewal is actually running.
4. Put both the http and www variants of your homepage through Redirect & HTTP Status Checker. All four should land on one canonical address in a single permanent hop.
5. Read the headers of the homepage and one inner page with HTTP Header Checker, watching for X-Robots-Tag and cache directives in particular.
6. Run Robots.txt Tester and Sitemap Finder & Validator: is the file reachable, is the sitemap declared, is the URL count close to the number of pages you actually have?
7. Verify compression with Gzip / Brotli Compression Test. If it is off, that is the highest-return technical fix available to you today.

Five findings that come up again and again

• Redacted WHOIS is normal, missing WHOIS is not. Since GDPR, most registrars hide registrant details, so an empty owner field means privacy, not a broken lookup. What should still be there are the dates, the status codes and the name servers — if those are missing too, the domain itself is in an unusual state.
• Both the www and non-www versions left live. Two addresses serving the same content read as two sites. Pick one, redirect the other permanently, and confirm the chain in Redirect & HTTP Status Checker. The tag-level counterpart is in the canonical tag guide.
• Hosting on the wrong side of the world. If your visitors are all in one country and the server is on another continent, every request carries a noticeable delay. IP & Geolocation Lookup tells you where the hosting really is; without a CDN this is the first thing you will notice on the Core Web Vitals side.
• A sitemap nobody has looked at since launch. Deleted URLs, old-domain URLs, noindexed URLs, parameter duplicates — all of them keep being submitted for crawling. Sitemap Finder & Validator catches the invalid entries, and crawl budget explains why it matters at scale.
• Silent 5xx responses on shared hosting. A server refusing some requests at peak hours is usually invisible in a browser, but it consumes crawl budget and delays indexing. A few checks with HTTP Header Checker at different times of day is the first evidence of it.

Which tool you need here depends on the situation more than on the site. Setting up a new site: WHOIS Lookup, DNS Records Lookup and SSL Certificate Checker are enough. After a migration or redesign, Redirect & HTTP Status Checker and Sitemap Finder & Validator are indispensable. Diagnosing a "will not index" fault, HTTP Header Checker and Robots.txt Tester are the two places the cause almost always turns out to be. Planning a move? The full list is here: the website migration SEO checklist.

What these tools do not do

The honest limit: each of these sends one request to one address. They do not crawl your whole site, they do not watch your server continuously, and they will not tell you when something breaks. They answer "is it sound right now" definitively, and cannot answer "was it sound last night". For continuous monitoring use an uptime service, and for the indexing side use the Pages report in Search Console — both are free, and both sit alongside these tools rather than replacing them.

The second limit: the result is whatever the server returned to us. A CDN or firewall can respond differently to requests from other countries or other user agents, in which case the tool is telling the truth while Googlebot sees something else. The only definitive way to know what Googlebot sees is the URL Inspection tool in Search Console. Use the two together: measure the raw facts here, read Google's interpretation there. To go further, see the technical SEO audit checklist, how to fix "crawled – currently not indexed" and log file analysis for SEO.

The 3 free tools in the Local, Brand & Social category look outward rather than inward: can a customer near you find you, where does your name appear across the web and the news, and are your social profiles actually connected to your brand? Every other category measures a page. This one measures a business. What ranks in the map pack is not a URL but an entity — and for that entity to hold together, your name, address, phone number and profiles have to corroborate each other everywhere they appear.

Why these three tools belong together

A local audit, a brand mention feed and a social profile scan look like three unrelated jobs. They are three vantage points on one question: does the web agree on who you are? Search engines do not build a business from a single source. They assemble it out of repeated, non-contradictory signals — the contact block on your site, your Business Profile, directory listings, your name in news coverage, your social accounts. When those line up there is one business and the engine shows it with confidence. When they do not, the system hedges: you slip down the map pack, no knowledge panel appears, the phone number is not surfaced.

This is also the cheapest category to win in if you are a small business. There is no content to produce and no links to wait for; the work is mostly consistency edits plus one structured-data block — a few hours that pay off faster than months of publishing. For a fuller starter kit see the tools by site type section above.

Which tool answers which question

• Am I ready to rank locally? Local SEO Audit checks the local signals on your own site one by one: are name, address and phone present as real text rather than baked into an image, is there LocalBusiness structured data and does it contradict what the page says, is there a contact page and opening hours, is the phone number tappable, is a map embedded. Anything missing you generate with Schema (JSON-LD) Generator and verify with Structured Data Checker. Full background: local SEO, citations and NAP consistency and Google Business Profile optimisation.
• Where is my name coming up? Brand Mention Monitoring queries live news and RSS feeds for a brand or keyword. It earns its place twice over: on the reputation side you see coverage while it is still fresh, and on the SEO side you catch unlinked mentions — pages that name you without linking, which are the easiest links to ask for because the interest already exists. Run the same query on a competitor and you get the publications they are showing up in: backlink analysis and link building.
• Is my social presence tied to my brand? Social Media Presence Tracker crawls your site for the profiles it actually links to and checks whether pages are ready to be shared at all (Open Graph tags, a share image). The metric that matters here is not follower count but connection: a profile that is neither linked from your site nor named in your sameAs array gives a search engine no reason to attach it to your brand. Preview the share card with Open Graph & Twitter Card Checker and fill the gaps with Meta Tag Generator.

How many places should the same details live?

A local audit usually reports the same thing: the information exists, but not where it counts. The working rule is four placements and one version. Name, address and phone belong in the footer of every page as real text; the contact page carries those plus opening hours, a map and directions; the same details are written once more for machines in LocalBusiness structured data; and social profiles are both linked in the footer and named in the sameAs array.

Multi-location businesses change the rule. Each location wants its own page carrying only that location's address, phone and hours. Stacking five addresses on a single "Our locations" page does not give a search engine five businesses — it gives one page that is ambiguous about all of them. The location pages also have to differ from each other beyond the address block: service area, directions, staff and local detail at minimum, or they get flagged as near-duplicates by Thin Content Checker.

A twenty-minute local visibility pass

1. Run Local SEO Audit on your homepage and your main service page. Sort what comes back into two piles: information missing from the page (address, hours, phone) and information present but never written for machines (schema).
2. Compare the name, address and phone on your site with your Business Profile character by character — abbreviations, punctuation and district included.
3. Generate the LocalBusiness block with Schema (JSON-LD) Generator, add it to the page, then confirm it parses with Structured Data Checker.
4. Run Social Media Presence Tracker; link any unlinked profile from the footer and put the same URLs in the sameAs array of your Organization schema.
5. Run Open Graph & Twitter Card Checker on a page you actually share. A missing image or title means your links are posting as a grey box.
6. Query your brand name in Brand Mention Monitoring, keep a list of unlinked mentions, and repeat monthly. That list becomes the most realistic link prospect file you have.

Five findings that come up again and again

• Three versions of the same address. One on the Business Profile, a slightly different one in the site footer, a third in a directory with the suite number dropped. To a person they are the same place; to a search engine they are candidates for different businesses. Pick one canonical version and use it verbatim everywhere.
• A call-tracking number that appears nowhere else. Swapping the number on your site for a tracking line breaks the strongest matching signal you have. If you need call tracking, keep the primary number visible and in schema, and use dynamic insertion that falls back to it.
• Contact details that only exist inside an image. A designed footer graphic with the address and phone in it is invisible to every parser. The text has to be text; the graphic can stay as decoration.
• Schema that contradicts the page. Old opening hours in LocalBusiness markup while the page shows new ones is worse than no markup, because the two sources disagree and neither can be trusted. Regenerate the block whenever the visible details change.
• A service-area business publishing a storefront address. If customers do not come to you, listing a home address or a virtual office as a walk-in location is a common way to lose a Business Profile. Model the service area instead and keep the site consistent with it: E-E-A-T and trust signals.

What these tools do not do

The honest limit: none of these tools reads your Google Business Profile. They cannot see your categories, photos, reviews or posts, because that data is only exposed to the owner inside their own dashboard. What they measure is the half you control — your site and your general visibility across the web. The two are complements, not substitutes: you do the profile work in the dashboard, and you confirm here that the profile and the site are not telling different stories.

The second limit: they do not tell you your position in the map pack. Local ranking shifts with where the searcher is standing — the same query can put you third from one neighbourhood and seventh two kilometres away, so a single "local rank" number does not exist. Brand monitoring has a stated boundary too: it queries live news and RSS feeds, not the entire web and not closed social accounts, which makes it an early-warning system rather than a complete mention archive. Next reading: the NAP and citations guide, the Business Profile guide and, for the markup side, structured data and schema.

The 9 free tools in the Generators & Utilities category do not measure anything — they produce something: a syntactically valid version of the file or snippet you are about to paste into your site. robots.txt, meta tags, JSON-LD structured data, .htaccess redirect rules, llms.txt, a tagged campaign URL and a clean URL slug. Every other category diagnoses; this one turns the diagnosis into text you can ship. That is why it is usually opened after an audit rather than before one.

Why generate these instead of hand-writing them

Because the reader is a machine and the tolerance is zero. Writing Disallow: / when you meant Disallow: /admin/ is a one-character difference that closes the whole site to crawling. A missing comma in JSON-LD makes the rich result disappear with no warning at all — it simply stops working. A wrong rule in .htaccess produces a redirect loop and the site fails to open in a browser. These are not "could be better" files; they are on/off switches.

They are also written rarely — once at setup, once at a migration — so nobody keeps the syntax in their head, and trying to recall it two years later is how mistakes get made. The workflow in this category is always the same: generate, publish, verify. Every generator has a checker counterpart, and the job is not finished when you paste the file but when you confirm it on the live URL.

Which tool answers which question

• Where should crawlers be allowed? Robots.txt Generator builds a valid robots.txt with allow/disallow rules, crawl-delay and the sitemap line. Once it is live, confirm the rule behaves as intended with Robots.txt Tester: the robots.txt guide.
• How should AI models summarise your site? llms.txt Generator (AI / GEO) turns a site name, a short summary and a list of key pages into a valid llms.txt (plus an optional llms-full.txt scaffold) — effectively a table of contents written for models. It is a new convention, so almost nobody has published one; it takes ten minutes: the llms.txt guide and managing AI crawlers in robots.txt.
• What should the page tags say? Meta Tag Generator outputs copy-ready title, description, robots, Open Graph and Twitter tags. Check how the result will look in the results page with SERP Snippet Preview and what the live page currently sends with Meta Tag Analyzer. Writing rules: title tag optimisation and writing meta descriptions.
• How is structured data written? Schema (JSON-LD) Generator produces valid JSON-LD for Organization, WebSite, Article and LocalBusiness — the four types that cover brand identity, blogs and local business pages. After adding it, confirm it parses with Structured Data Checker: the structured data and schema guide.
• How do the redirect rules go in? .htaccess Redirect Generator writes HTTP→HTTPS enforcement, the www / non-www decision and old→new 301 rules as a single block. Always test the result with Redirect & HTTP Status Checker: 301 vs 302 redirects, the HTTPS migration guide and the migration checklist.
• Where did that campaign traffic come from? UTM Campaign URL Builder builds trackable URLs with utm_source, medium, campaign, term and content — the free way to see newsletter, social and QR-code clicks separately in analytics: measuring SEO results.
• How should the URL be written? SEO URL Slug Generator converts any title into a lowercase, hyphenated, ASCII slug, transliterating accented and non-Latin characters instead of leaving them to be percent-encoded by the browser: URL structure best practices.
• Everyday utilities. Encoder / Decoder & Hash puts Base64 and URL encoding/decoding alongside MD5, SHA-1 and SHA-256 hashing in one place — for decoding a mangled parameter or checking a signature. Strong Password Generator produces random passwords with a configurable length and character set, which is the quickest route when you are opening a new panel or FTP account.

Where each generated file actually goes

The thing that costs the most time in this category is not the content of the file but its location. robots.txt and llms.txt have to sit at the root of the domain — site.com/robots.txt counts, site.com/folder/robots.txt means nothing at all. robots.txt is also per host: blog.site.com needs its own file. WordPress adds a trap on top of that, because with no real file at the root it serves a virtual robots.txt, and a plugin edit can end up competing with a physical file you uploaded yourself. Robots.txt Tester tells you which one is actually live.

.htaccess goes in the web root of an Apache install and takes effect immediately — there is no restart, so a bad line can take the site down that second. Keep a copy of the current file before you touch it. Meta tags are only valid inside <head>, and because many themes also inject their own title you can end up with two; Meta Tag Analyzer catches that. A JSON-LD block, by contrast, can sit anywhere in the document. Finally, if a CDN or caching plugin is in front of the site, purge after you publish — otherwise the checker keeps reading the old version and you go looking for a fix that is already in place.

A ten-minute setup pass

When you launch a new site or finish a migration, work through this order — it fits in one sitting.

1. Generate robots.txt with Robots.txt Generator (do not omit the sitemap line), publish it, and verify with Robots.txt Tester.
2. Apply the HTTPS and www decision with .htaccess Redirect Generator, then test all four versions of your homepage in Redirect Checker — every one should reach a single address in a single hop.
3. Generate the Organization block with Schema (JSON-LD) Generator, plus LocalBusiness if you serve a physical area, and confirm with Structured Data Checker.
4. Write the tags for your homepage and most important inner page with Meta Tag Generator, checking lengths in SERP Snippet Preview.
5. Publish an llms.txt with llms.txt Generator — today this is the step with the least competition behind it.
6. Build every outbound campaign link through UTM Campaign URL Builder, and run post titles through SEO URL Slug Generator as you publish.

The five mistakes this category catches most often

• Confusing robots.txt with noindex. Blocking a page with Disallow does not remove it from the index — it does the opposite, hiding the noindex tag on the page so it can never be acted on. To deindex, the page must stay crawlable and send noindex: noindex vs nofollow vs disallow.
• Marking up content that is not on the page. Structured data describes the page; a review rating, a price or an FAQ block that no visitor can see does not win a rich result, it invites a manual action. The JSON-LD you generate has to match what is on screen.
• Stacking redirects into a chain. When http→https, non-www→www and old→new fire one after another, the visitor takes three hops. Combine the rules so each request lands in one; Redirect Checker shows the difference immediately.
• Putting UTM parameters on internal links. Tagging links between your own pages breaks the session in analytics and makes your traffic look like it referred itself. UTM is only for links arriving from outside.
• Generating a file and never checking it live. The most common failure in this category is not a bad generator output — it is a good one that was pasted into the wrong place, saved with the wrong name, or cached by a CDN. Every generator here has a checker; the pass is not done until the checker agrees.

What these tools do not do

The honest limit: these tools produce text, they do not change your site. You still have to put the file on the server, paste the tag into the template and confirm the result on the live URL — until then nothing has happened. And .htaccess is Apache-only; nginx and IIS support the same rules with different syntax, so what you take from that generator is the logic rather than the file itself.

Coverage is bounded too: Schema Generator builds the four most-used types, so Product, Offer or HowTo markup still has to be written by hand — and whatever you write, validate it with Structured Data Checker. One frequent misunderstanding on the utility side: Base64 is encoding, not encryption, and MD5 and SHA are one-way digests — neither hides data from anyone. Generated passwords are created server-side with a cryptographic random source and are not stored anywhere, but for critical accounts use a password manager. Next reading: the technical SEO audit checklist and the XML sitemaps guide.