Text Similarity Checker
Compare two texts and get a similarity score.
- Reading time:
- 2 min
- Last updated:
- Price:
- Free, no signup
Type or paste text to see the result.
What the Text Similarity Checker does
Compare two text passages side-by-side to measure their structural and vocabulary similarity. See an exact percentage overlap score using Levenshtein distance, Jaccard similarity, and cosine token matching.
Spot shared sentences, copied paragraphs, or minor paraphrasing between two drafts in real time.
Why the Text Similarity Checker is useful
Verifying whether an article revision differs significantly from an original draft prevents accidental duplicate content penalties in search engines.
Educators and editors need a fast, private tool to check student assignments or freelance submissions for excessive quotation overlap.
Also known as: text similarity checker, compare two texts, similarity score, free text similarity checker, online text similarity checker, text similarity checker online free, text similarity checker tool.
How to use the Text Similarity Checker
- 1
Paste original text
Insert the reference or baseline text into the left editor pane.
- 2
Paste comparison text
Insert the revised, translated, or submitted copy into the right editor pane.
- 3
Review similarity percentage
View the overall similarity coefficient along with highlighted matching phrases.
Key features
- Calculates Levenshtein edit distance and Jaccard word-set similarity scores
- Side-by-side visual comparison highlighting matching word sequences
- Case-insensitive and whitespace-normalized comparison modes
- Completely offline comparison ensuring confidentiality of proprietary drafts
Benefits
- Prevents SEO duplicate content issues between localized landing pages
- Audits the originality of revisions and freelance content deliverables
- Verifies whether an AI summary paraphrased sufficiently or copied source text
Real-life use cases
SEO landing page auditing
An agency compares city-specific service pages to ensure at least 60% unique content across locations.
Essay overlap screening
A teacher checks two lab report submissions to confirm independent work.
Press release syndication
A PR manager checks how much of a company announcement made it into a journalist's coverage.
Tips for the best results
- A similarity score above 70% typically signals severe search engine duplicate content risk.
- Strip headers and standard footers before comparing to prevent inflated similarity scores.
- Use Jaccard similarity for unordered keyword lists and Levenshtein for sequential narrative prose.
Conclusion
Measure text overlap and protect your content originality with precise similarity scoring.
Frequently asked questions
What is the difference between Levenshtein and Jaccard similarity?
- Levenshtein measures character edit steps; Jaccard measures the proportion of shared unique words.
What percentage is considered duplicate content by Google?
- While Google has no official number, maintaining under 30–40% similarity is best practice for distinct landing pages.
Does capitalization affect the similarity score?
- You can toggle case-sensitivity on or off based on your comparison needs.
Can I compare code snippets?
- Yes, code and configuration files compare accurately line by line.
Are my compared texts uploaded to any database?
- No, all comparisons execute strictly inside your local browser.
Is there a limit on text size?
- It comfortably compares passages containing thousands of words in fractions of a second.
Related tools you may need
- Text Comparison Tool — Find duplicated phrases between two documents.
- Keyword Prominence Checker — Score how early and prominently a keyword appears.
- Readability Score Calculator — Flesch, Fog, SMOG, ARI and Coleman–Liau in one pass.
- Readability Checker — Score your writing with Flesch Reading Ease and grade level.
- JSON Diff Checker — Compare two JSON documents and list every difference.
- Text Diff Checker — Compare two texts line by line and see the differences.
- Text Complexity Calculator — Measure sentence length, long words and grade level.
- Meta Description Generator — Turn an article into a 155-character meta description.
Keep exploring
Browse the full tools directory, filter by category, or read guides on the Text Tools Hub blog.