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Text Diff Checker
Compare texts with a clear left/right red-green diff. Processing stays on your device — no upload, no account.
How to use Text Diff Checker
- Paste original text on the left and modified text on the right.
- Review the aligned side-by-side diff - red removed, green added.
- Copy a unified diff if you need plain text.
Why use this free text diff tool?
- All processing happens locally in your browser. Your files are never uploaded to a server.
- Side-by-side panes with line numbers.
- Red / green highlighting.
- Synced scroll + unified copy.
Technical details
Line-based LCS diff rendered as paired rows. Empty placeholders keep left and right aligned like GitLens.
Text Diff Checker FAQ
Are texts uploaded?
No. All processing happens locally in your browser. Your files are never uploaded to a server.
Word-level diff?
This tool highlights line-level changes with side-by-side coloring.
Binary files?
Paste text only - not images or binaries.
Large files?
Very large pastes may slow the tab; split into sections if needed.
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