Developer & Text ToolsFree100% Client-Side
Diff Checker
Compare two blocks of text and instantly see line-by-line additions, deletions, and unchanged content.
100% privateRuns instantly in-browserUpdated regularly
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100% Secure & Private
Your files never leave your computer — processed in-browser with WebAssembly.
Lightning Fast
No queues, no uploads — results in milliseconds, even on mobile.
Modern & Ad-Light
Clean interface, dark mode, and no popups — built to beat legacy tools.
What you get
- LCS-based line diff engine
- Color-coded added/removed lines
- Ignore whitespace or case toggle
- Live stats: lines added, removed, changed
- 100% client-side, no upload
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Frequently asked questions
No. All comparison happens locally in your browser; your text never leaves your device.
Yes, toggle 'Ignore whitespace' or 'Ignore case' before comparing to reduce noise from formatting-only changes.
It uses a longest common subsequence (LCS) based line-diff algorithm to compute a minimal set of additions and removals.