DocomintText Comparator (Similarity %)
Score how similar two blocks of text are, as a percentage, instantly in your browser.
Where Text Diff Checker shows what changed, this reduces the comparison to a single similarity score — useful for a quick "how close are these two" check on product descriptions, survey responses, or duplicate-content screening.
Example: Comparing "The cat sat on the mat" against "The cat sat on the rug" returns a high similarity score, close to 90%, since only one word out of six differs.
How it works
- Paste the first text
- Paste the second text
- A similarity percentage appears instantly, on your device
Frequently asked questions
How is the similarity percentage calculated?
From the Levenshtein edit distance — the minimum number of single-character insertions, deletions, or substitutions to turn one text into the other — expressed as a percentage of the longer text's length.
Is my text uploaded anywhere?
No — Text Comparator (Similarity %) runs entirely in your browser using JavaScript/WebAssembly. Your text is never sent to a server.
What similarity percentage should I treat as 'duplicate' content?
There's no universal cutoff, but many SEO tools flag anything above roughly 80% as near-duplicate — treat the score as a signal to review manually rather than an automatic pass/fail threshold.