Diff Checker
Compare two texts side by side. See added, removed, and changed lines. Free online diff checker for code and documents. All processing runs in your browser.
Diff checker
Diff
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What is this?
A diff checker compares two texts line by line and highlights differences. Removed lines (in first only) show in red; added lines (in second only) show in green. Unchanged lines stay neutral. Paste the original in the first box and the modified version in the second. The diff highlights exactly what changed. Useful for code reviews, document comparison, and version tracking. Similar to git diff or other diff tools. All processing runs in your browser—your text never leaves your device. No upload, no server, complete privacy. Works with code, contracts, or any text. See additions and deletions at a glance.
When to use
Use for code reviews, document comparison, or version tracking. Example: Compare contract drafts. See what changed between code versions. All processing in browser—text never leaves your device. Developers review code changes. Compare contract versions before signing. Track document revisions. See what changed in a config file. Debug by comparing before and after. Essential for version control. No signup or upload. Paste and compare. Perfect for sensitive documents. Instant visual diff.
How to use
Paste the original text in the first box and the modified text in the second. The diff shows removed lines (red, −) and added lines (green, +). Unchanged lines appear in gray. Useful for code reviews, document comparison, and version tracking.
Frequently asked questions
- We compare two texts line by line. Lines only in the first text are shown as removed (red). Lines only in the second are shown as added (green). Unchanged lines stay neutral.
- Yes. Paste your original code in the first box and the modified version in the second. The diff highlights added, removed, and unchanged lines.
- No. All comparison runs in your browser. Your text never leaves your device.