Compare two texts and highlight every difference
Free online text diff checker. Compare two blocks of text side by side and instantly see additions, deletions, and changes highlighted line-by-line or word-by-word.
A diff shows the differences between two versions of text. Lines or words added in the new version are highlighted green, and those removed are highlighted red.
Line mode compares full lines and is best for code or structured content. Word mode compares individual words and is best for prose where lines don't have fixed meaning.
Yes. Line mode works well for code comparison. For JSON specifically, use the JSON Diff tool which normalises formatting before comparing.
There is no hard limit, but very large inputs (>1MB) may be slow since all comparison happens in your browser.
Yes. Everything runs in your browser. Your text never leaves your device.
Get all tools in your browser
Install the Chrome extension for one-click access to every tool — no tab switching needed.
Last updated: January 2025