Text Diff Checker
Compare text files, code snippets, or documents to find changes instantly.
Comparison Result
Diff Checker — Spot Every Difference
Whether you are reviewing code, checking an edited document, or comparing two config files, this free diff checker highlights exactly what changed. Paste the original and the modified text, then choose line, word or character mode to control how fine-grained the comparison is.
Differences are highlighted inline the moment you compare, with added and removed text clearly marked. The comparison runs entirely in your browser, so proprietary code and private documents never leave your device.
Three comparison modes
Line mode shows which lines changed, word mode pinpoints edited words, and character mode catches single-character typos — pick the granularity that fits the job.
Instant visual highlighting
Changes are marked directly in the text with clear colors for additions and removals, so you can scan a long document and see every edit at a glance.
Built for code and prose
Developers diff config files and snippets before committing; writers diff drafts against revisions. Either way, you get the answer in seconds without installing a diff tool or pasting secrets into a server.
How to use
- Paste the original text in the left box.
- Paste the modified text in the right box.
- Choose Line, Word or Character mode.
- Click Compare to see the differences highlighted.
Frequently Asked Questions
What is a diff?
A diff is a comparison of two texts that shows exactly what was added, removed or changed between them. Developers use diffs to review code changes before merging.
What is the difference between line, word and character mode?
Line mode flags whole lines that differ, word mode highlights only the changed words within a line, and character mode marks individual changed characters — useful for catching typos.
Can I compare code with this tool?
Yes. Paste any code, JSON, config or plain text. The tool compares raw text, so it works with every language and format.
Is my text uploaded anywhere?
No. The comparison runs completely in your browser, so your code and documents stay private.
Can I compare files instead of pasted text?
This tool compares pasted text. Open your files in any editor, copy the contents, and paste each version into the two boxes.
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