Compare text side-by-side, unified diff, word-level and character-level diff.
Paste text into both boxes above and press Compare or Ctrl+Enter
A text compare tool (diff checker) is essential for finding differences between two texts quickly and accurately. Our free online diff checker lets you compare text side-by-side with a unified diff view, word-level and character-level diff highlighting, similarity scoring, and comparison history saved in your browser.
Whether you're a developer reviewing code changes, a writer comparing drafts, a student checking for plagiarism, or an editor proofreading content — this tool makes text comparison instant and free. Processing happens entirely in your browser.
Finds and highlights differences between two texts line by line, with color-coded added, removed, and modified lines.
Yes, completely free with no limits, subscriptions, or hidden fees.
Yes. Processing happens entirely in your browser. Your text never leaves your device.
Side-by-side view and unified view (single column with +/- markers).
Yes. Click the search icon in the diff toolbar to search and navigate matches.