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YFT
Client-side ProcessingUpdated 2026-02-11Report issue

Runs fully in your browser. Inputs stay on your device. See recent fixes on changelog.

String Similarity Checker

Calculate similarity percentage between two strings.

FreeRuns in browserstring similaritytext similarity
1 lines
1 lines
Cmd/Ctrl+Enter Primary actionCmd/Ctrl+Shift+L Load sampleCmd/Ctrl+Shift+X Clear/resetCmd/Ctrl+Shift+C Copy result

About String Similarity Checker

Calculate similarity percentage between two strings. Calculate string similarity percentage online for free. Measure how alike two strings are using Levenshtein edit distance with comparison statistics. No signup needed. Uses professional-grade diff algorithms to highlight insertions, deletions, and modifications at the line or character level. Includes statistical summaries and side-by-side visual comparison. Everything runs client-side in your browser for maximum speed and privacy — no data is sent to any server, and no signup is required.

Related tools: Text Diff Tool, Word-Level Diff, Character-Level Diff

How to Use String Similarity Checker

  1. Enter content in both input fields (A and B).
  2. The tool compares them and highlights differences.
  3. Review the comparison results and statistics.

Frequently Asked Questions

What is String Similarity Checker?
Calculate string similarity percentage online for free. Measure how alike two strings are using Levenshtein edit distance with comparison statistics. No signup needed.
How are differences detected?
The tool uses established diff algorithms similar to those in version control systems like Git. It identifies insertions, deletions, and changes at the line or character level, depending on the comparison mode.
Can I compare large texts?
Yes, the comparison runs entirely in your browser and can handle large documents efficiently. For very large files, processing may take a moment longer, but there are no hard size limits imposed by the tool.
What comparison algorithms are used?
The tool implements the Myers diff algorithm, which is the same algorithm used by Git and other professional-grade diff tools. This ensures minimal, human-readable diffs that clearly show what changed.
Is String Similarity Checker free to use?
Yes, comparing content is entirely free with no size limits or account requirements. Everything runs in your browser.
Is my data safe when using String Similarity Checker?
Yes, both inputs stay entirely in your browser. No data is sent to any server, so your content remains private and secure.

Related Tools

Text Diff Tool
Compare two texts and highlight differences.
Word-Level Diff
Compare two texts at the word level.
Character-Level Diff
Compare two texts at the character level.