What Is LLMO (LLM Optimization)? A Practical 2026 Guide
LLMO is the practice of making your content easy for large language models to ingest, understand and reproduce accurately. Here is what it is and how to do it.
Read article →How it works
- Enter a domain or full URL (for example
https://example.com). - The tool requests
/robots.txtfrom that host exactly as a crawler would and reads the raw response. - It parses the file line by line, grouping directives under each
User-agentblock. - You get a clean, structured breakdown of every rule plus the HTTP status and any sitemap URLs found.
What it shows
- HTTP status — whether the file exists (200), is missing (404) or errors.
- User-agent blocks — rules grouped per crawler, including the
*wildcard. - Disallow rules — the exact paths each crawler is told not to fetch.
- Allow rules — explicit exceptions that override a broader Disallow.
- Crawl-delay — any throttling directive a crawler is asked to respect.
- Sitemap declarations — every
Sitemap:line and its URL. - Raw file — the unmodified source so you can spot stray characters.
Common use cases
- Catching accidental blocks — confirm a
Disallow: /isn't hiding your whole site. - Pre-launch checks — verify a staging block was removed before going live.
- Sitemap discovery — find the sitemap URLs a site advertises to crawlers.
- Auditing competitors — see which sections a rival keeps out of the index.
Example
Run the tool on a store and you might see a User-agent: * block that disallows /cart/ and /checkout/, an explicit Allow: /cart/info exception, and a Sitemap: https://example.com/sitemap.xml line — confirming the right pages are blocked while products stay crawlable.
Frequently asked questions
Is the Robots.txt Tester free?
Yes — completely free, with no signup and no limits. Test as many domains as you like.
Does robots.txt stop a page from being indexed?
Not on its own. A Disallow only stops crawling; a blocked URL can still appear in results if other pages link to it. To keep a page out of the index use a noindex tag — check tags with the Meta Tag Analyzer — and read our robots.txt guide.
How is this different from generating a robots.txt?
This tool reads and validates a live file. To build a new one from scratch use the Robots.txt Generator and then confirm the sitemap it references with the Sitemap Finder & Validator.