Text Similarity Checker
Compare two texts and get a similarity score.
- Reading time:
- 4 min
- Last updated:
- Price:
- Free, no signup
Type or paste text to see the result.
What the Text Similarity Checker does
Compare two blocks of text and get Jaccard and cosine similarity scores plus the shared and unique vocabulary, so you can see how close a rewrite really is to the original. Good SEO copy is really just clear writing with a bit of structural discipline. The Text Similarity Checker makes that discipline visible — you can see how often each keyword appears, how long your paragraphs are, and whether your copy leans too heavily on a handful of phrases.
The tool ignores common English stop words so the results reflect real content, not filler. Density is reported as a percentage of total words, which is the standard way editors and SEO specialists talk about keyword usage.
Why the Text Similarity Checker is useful
Everything runs in your browser, so drafts under NDA, unpublished pages and client work stay on your device. There is no upload, no account and no logging of the text you paste.
Use the Text Similarity Checker alongside the Word Counter, Reading Time Calculator and Text Case Converter to run a full pre-publish check in a couple of minutes. It's the same routine professional editors use — just faster and free.
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How to use the Text Similarity Checker
- 1
Paste your article or web copy
Add the content you want to analyse to the Text Similarity Checker. Long-form posts, product pages and landing copy all work.
- 2
Read the live analysis
The tool recalculates on every edit, so you can tweak your copy and watch the metrics change in real time.
- 3
Copy or export the report
Copy the analysis or Download .txt so you can share it with an editor, drop it into a brief, or archive it alongside the piece.
Key features
- 100% free with no signup, watermarks or usage limits
- Runs entirely in your browser — your text never leaves the device
- Live results update on every keystroke
- One-click Copy, Download .txt and Clear buttons
- Works on mobile, tablet and desktop with dark and light mode
- Optimised for speed and Core Web Vitals — the page loads in under a second
Benefits
- Ship SEO-ready copy without leaving your browser
- Balance keyword usage against readability with instant feedback
- Audit competitor content in the time it takes to paste it
Real-life use cases
Pre-publish content checks
A quick pass before you hit publish catches keyword stuffing, thin sections and paragraphs that run too long for mobile screens.
Competitor research
Paste a ranking page and you can see how its author balanced keyword usage, length and structure.
Client reporting
Concrete numbers make an editorial recommendation much easier to defend in a review call.
Tips for the best results
- Write for the reader first, then check the numbers — not the other way round.
- Keep primary keyword density in a natural range instead of chasing an exact percentage.
- Re-run the check after editing, because cuts change every ratio.
Conclusion
The Text Similarity Checker does one job properly: compare two texts and get a similarity score. It is free, needs no account, runs entirely in your browser and gives the same answer every time. Bookmark it, keep it open in a tab while you work, and pair it with the related tools below to build a fast workflow you never have to install.
Frequently asked questions
What does the Text Similarity Checker do?
- It tokenises both texts into lowercase words, then reports Jaccard similarity (shared words over total distinct words) and cosine similarity over word frequencies.
What input format does it expect?
- Paste the first text, a line containing only --- and then the second text.
Is my data uploaded anywhere?
- No. Everything runs locally in your browser using JavaScript, so your text never leaves your device and the tool keeps working offline once the page has loaded.
Is the Text Similarity Checker really free?
- Yes — every feature of the Text Similarity Checker is free with no signup, no watermarks and no daily limits. Text Tools Hub is funded by lightweight display ads.
Do you store the text I paste?
- No. The Text Similarity Checker runs entirely inside your browser. Nothing is uploaded, logged or stored on our servers.
Can I use it on my phone?
- Yes. The Text Similarity Checker is fully responsive with dark and light mode, so it works comfortably on any modern phone, tablet or laptop.
Does it work offline?
- Once the page has loaded, the tool keeps working even if your connection drops, because all processing happens in the browser.
Can I use the Text Similarity Checker for commercial writing?
- Absolutely. There are no licensing restrictions on the text you process — use the results in books, blogs, apps, contracts or client work.
Will this help my rankings?
- The tool surfaces information that helps you write more relevant, readable content, which is what search engines reward. It does not modify your site directly.
Do I need to install anything to use the Text Similarity Checker?
- No. The Text Similarity Checker is a web page. Open it in any modern browser on any device and it is ready — there is nothing to download, install or update.
Related tools you may need
- Keyword Density Checker — See the most frequent words and their density in your text.
- Readability Checker — Score your writing with Flesch Reading Ease and grade level.
- Grammar Checker — Catch common grammar mistakes with pattern-based checks.
- Spell Checker — Highlight likely misspellings against a common-word dictionary.
Keep exploring
Browse the full tools directory, filter by category, or read guides on the Text Tools Hub blog.