Diff summary
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How this diff tool works
Getting started
- Paste or upload. Drop your original text on the left and the new version on the right. You can drag and drop raw files (.js, .html, .json, .md, .txt) straight into the text boxes.
- Run the comparison. Hit the compare button to immediately scan for changes.
- Navigate the output. Use the previous and next buttons to jump directly to modified lines instead of scrolling manually through large text files.
- Track history. The change log sidebar keeps a running summary of the differences found.
Why we built this checker
- Fast and secure. We built the text comparison engine to find exact character and line differences without bogging down your machine. Everything runs locally in your browser. Your private documents and proprietary code never get sent to a remote server.
- Clear highlights. Deleted text gets a red background, new text gets green. It saves you from squinting at raw terminal output to figure out what broke in a config file.
- Dark mode default. Comparing code differences on a bright white screen late at night is miserable. Toggle the theme to save your eyes.
- Simple workflow. No heavy software to install, no git commands to remember. Just paste and compare.
Common Use Cases
Code Reviews
Catching a stray character, a modified variable, or an accidentally deleted bracket takes seconds here. Paste your raw code and let the diff checker highlight the exact syntax changes before you push an update or commit to your repository.
Editing Drafts
When a co-worker or editor sends back a revised document without tracking their changes, finding what they actually tweaked is exhausting. Dropping both versions into the text boxes reveals the rewritten sentences instantly.
Contract Revisions
Legal documents go through dozens of revisions. Reading them side-by-side manually is just asking to miss a swapped word or a modified clause. Let the comparison tool highlight exactly what changed in the fine print.