All tools

Diff & Merge

See exactly what changed between two versions of text, code, JSON or a spreadsheet, then pick the changes you want to keep.

4 tools

Text & Code Diff Compare two texts side by side with changed words or characters marked, ignore whitespace or case if you like, and save a patch. JSON Diff Compare two JSON documents by structure: every added, removed and changed value with its path, exact numbers and a JSON Patch. CSV Diff Compare two CSV or TSV files row by row, matched by a key column, with every changed cell shown and a report to download. Text Merge Merge two versions change by change, or three-way from a common original with conflicts to settle, then edit and save the result.
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  • Opens in its own window, like any app
  • Works without an internet connection
  • Starts instantly from your home screen or dock

Look for the install icon at the right end of your browser’s address bar, or open the browser menu and choose Install Interformat.