Compare two files or texts and see exactly what changed
Paste two versions of any text, code, config or document, or open two files, and this diff checker highlights every added, removed and modified line, down to the individual words that changed.
Text & File Compare (Diff Checker): 3 simple steps
- 1
Paste text into both boxes or use Open file for each side.
- 2
Choose side-by-side or unified view and set options such as ignore whitespace or case.
- 3
Review the highlighted differences and copy the unified diff if you need to share it.
It works for source code, JSON, logs, contracts and plain text. Nothing is uploaded: the comparison runs entirely in your browser, so confidential files stay on your device.
Built for speed and privacy
- Line and word level highlighting
- Side-by-side and unified diff views
- Ignore whitespace and letter case
- Private: files never leave your device
Text & File Compare (Diff Checker) FAQ
Use the Open file button above the Original and Changed boxes to load each file, or paste the contents. The differences are highlighted automatically.
Yes. The comparison happens locally in your browser; nothing is sent to a server.
Yes. Turn on Ignore whitespace and Ignore case to hide differences that only involve spacing or letter case.
Yes. Any text-based format works, including source code, JSON, YAML, CSV and logs. For spreadsheets use our Excel compare tool.
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