Text Diff Checker
Compare two pieces of text side-by-side and highlight every line and word change.
Quick answer: Compare two pieces of text side-by-side and highlight every line and word change.
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Frequently asked questions
- How is this different from a Word 'Compare' feature?
- Word's compare needs both files to be Word documents and is heavy. This diff is instant, plain-text, and runs entirely in your browser — perfect for emails, code, JSON, prose or anything copy-pasteable.
- Does it ignore whitespace differences?
- Toggle 'ignore whitespace' to mask trailing spaces and tab/space mixes — useful when comparing source code or YAML.
- Will it scale to large files?
- Up to roughly a megabyte of text on each side runs in well under a second on a typical laptop. Beyond that, a desktop diff tool will feel snappier.
- Is my text uploaded?
- No — the diff runs entirely in your browser using a small JavaScript LCS implementation. Nothing leaves your device.
- Can I download the diff as a patch?
- Yes — copy the unified diff output to paste into a code review or apply with the <code>patch</code> CLI.