String Similarity Calculator
Calculate grapheme Levenshtein edit distance and a clearly defined normalized similarity.
Loading tool…
How to use String Similarity Calculator
Compare two short strings by the minimum number of single-grapheme insertions, deletions, and substitutions. This metric measures spelling edits rather than meaning.
- Enter first string, second string.
- Choose the settings for string similarity calculator, then run the tool.
- Review the result and any limitations before copying or downloading it.
Good to know
- At most 500 graphemes per side, using rolling rows and at most 250,000 cells.
- Not semantic similarity, plagiarism detection, authorship proof, or identity verification.
- Processing is local. Output is limited to 1,000,000 text characters unless a stricter file limit is stated.
Common questions
Why is an anagram not necessarily highly similar?
Edit distance depends on order. The same letter inventory can require many edits.
Is this input sent to a server?
No. The application processes this input inside your browser tab and does not save it to persistent storage.
Keep going with related tools
All text →Text Diff
Compare two texts line by line and download an easy-to-read difference report, entirely in your browser.
TextAnagram Checker
Compare two texts for the same grapheme inventory with optional case and punctuation normalization.
TextTranscript Error Rate Reviewer
Compare supplied reference and hypothesis text with explicit WER/CER rules, complete edit counts and source-mapped JSON or CSV evidence.
DataBounded Record Linkage Candidate Review
Generate cross-table text-similarity candidates inside explicit exact blocks while retaining ambiguity for human review.
EducationSupplied Dictionary Word Ladder Solver
Find a shortest one-letter substitution path using only your supplied equal-length word list.