How to Do a Keyword Gap Analysis: 7 Free Steps
Learn how to do a keyword gap analysis in 7 steps: find the keywords competitors rank for and you don’t, sort the gaps, then turn them into a content plan.
Read article →How it works
- Paste your first text into the left box and the second into the right box.
- The tool normalizes both texts and breaks them into comparable tokens.
- It measures their overlap to produce a real similarity percentage.
- You get a clear score plus a sense of which passages match.
What it measures
- Similarity percentage — the headline overlap score between the two texts.
- Shared wording — words and phrases the two texts have in common.
- Unique content — how much of each text is distinct.
- Length difference — the relative size of the two inputs.
- Duplication signal — a quick read on whether content is too close.
- Word counts — totals for each text, for context.
Common use cases
- Duplicate content checks — make sure two pages are different enough to coexist.
- Plagiarism spot-checks — compare a submission against a source.
- Product descriptions — confirm variant pages are not near-identical.
- Rewrites — verify a rewritten paragraph differs enough from the original.
Example
Compare two category descriptions and you might get a 86% similarity score — a strong sign they are near-duplicates that could compete with each other. Rework one until the score drops well below 50%, and the two pages can rank for distinct intents instead of cannibalizing each other.
Frequently asked questions
Is the Text Similarity checker free?
Yes — completely free, with no signup and no usage limits. Compare as many texts as you like.
What similarity percentage is too high?
There is no fixed cutoff, but scores above roughly 70% usually mean the texts are near-duplicates worth differentiating. Aim to make competing pages clearly distinct.
How does this relate to SEO problems?
Duplicate and overlapping pages can trigger cannibalization. Pair this with the Content / Keyword Gap to differentiate coverage and the Google SERP Snippet Preview to refine each snippet, and read our keyword cannibalization guide to fix competing pages.
