Text Diff
Compare two blocks of text and instantly highlight additions, deletions, and changes. Free online diff checker with line-by-line comparison.
About Text Diff
Paste two versions of any text — code, documents, configs, or plain text — and instantly see exactly what changed. Added lines are highlighted green, removed lines red. Uses an LCS-based diff algorithm for accurate comparisons entirely in your browser.
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Your privacy is built in
Everything in Text Diff runs locally in your browser — your data never leaves your device and is never uploaded to a server, so nothing you enter is stored or seen by anyone else. No account, no sign-up, no watermark, and completely free.
Frequently asked questions
Is this a line-by-line or word diff?
The tool compares line-by-line using an LCS (Longest Common Subsequence) algorithm. Added lines are green (+), removed lines are red (−).
Can I compare source code?
Yes! Paste any code, configuration files, JSON, YAML, or plain text. Whitespace and indentation differences are shown accurately.
Is there a size limit?
The tool handles large texts efficiently in the browser, though very large files (1MB+) may take a moment to process.