Diff Checker
Compare two texts side by side using Myers' diff algorithm. View line-by-line additions, deletions, and inline word-by-word differences with syntax highlights.
Reviewed May 25, 2026. Privacy model: tool input is processed in your browser and is not uploaded to BytePane servers.
About Myers' Diff Checker
Comparing two versions of code, JSON payloads, or configuration files is a fundamental developer workflow. This diff checker uses Eugene W. Myers' O((N+M)D) diff algorithm -- the exact mathematical algorithm powering Git and GNU diff. By finding the shortest edit script (SES), it guarantees the optimal minimal set of line additions, deletions, and inline word changes between any two files.
Line-by-Line vs Inline Word-by-Word Diff
Traditional diff tools only highlight full lines as modified, forcing developers to manually scan long code statements to identify what changed. BytePane integrates granular word-by-word diffing directly inside modified line pairs: additions are rendered in bright green and deletions in highlighted red strikethrough.
All computations occur client-side in your browser using compiled WebAssembly and JavaScript. Zero code or text data is sent to external servers, ensuring complete privacy for sensitive API keys, SQL schemas, and proprietary algorithms.
Frequently Asked Questions
Which diff algorithm is used?
This tool integrates the battle-tested 'diff' library implementing Eugene W. Myers' O((N+M)D) greedy diff algorithm, the industry-standard algorithm utilized by Git and GNU diff. It computes the minimal edit distance path with linear space optimization.
How does inline word-by-word diff work?
When two lines are modified, the Myers word diff engine analyzes character and word boundaries within the line to isolate exact token edits, highlighting additions and deletions directly inside the changed line.
Can I ignore whitespace or case changes?
Yes. Check the "Ignore Whitespace" or "Ignore Case" toggles to exclude formatting differences or capitalization from the diff calculation.