Free Online Text Diff Checker
A free text diff checker compares an original and changed version side by side, highlighting deletions in red and additions in green. Switch between line-by-line and word-by-word mode — no signup, runs entirely in your browser.
Paste an original and a revised version into two panels and see differences highlighted instantly. Compare line by line or word by word with red for removals and green for additions. Uses JsDiff from CDN — your text never leaves the browser.
Comparison
Loading diff engine…
Runs 100% in your browser. Your data never leaves your device.
Uses JsDiff loaded from CDN to compute line and word diffs, then renders side-by-side highlighted panels — all comparison runs locally in your browser with no server calls.
How to Use Text Diff Checker
- Paste the original text in the left box and the changed text in the right box
- Choose Line by line or Word by word depending on how granular you need the comparison
- Review the comparison below — deletions appear in red, additions in green
- Edit either box and the diff updates instantly
When Would You Use This?
Editors reviewing contract or policy revisions paste the old and new drafts to spot wording changes without exporting to Word's compare feature or emailing files back and forth.
Developers checking release notes or config snippets diff two versions of plain text before committing — faster than opening a full IDE diff for small edits.
Students comparing essay revisions see exactly which sentences changed between drafts without installing desktop software.
Frequently Asked Questions
- Is this text diff checker free to use?
- Yes, completely free. No signup, no login, no payment ever.
- Do I need to create an account?
- No account needed. Open the tool, paste your two texts, and compare immediately.
- Is my data safe?
- Everything runs in your browser. Your text is never uploaded to our servers. We cannot see what you compare.
- What is the difference between line and word mode?
- Line mode treats each line as a unit — best for code, configs, and multi-line documents. Word mode highlights individual word changes within lines — better for prose and short edits.
- What do the red and green highlights mean?
- Red marks text that was removed or changed from the original. Green marks text that was added or changed in the revised version. Unchanged text appears without highlighting.
- Does this work offline?
- Once the page and JsDiff have loaded, comparison works offline. The library is cached by your browser after the first visit.