Best Free Text Diff / Compare
Compare two texts and see exactly what changed, line by line, in your browser.
100% free
No signup
No watermark
Files processed in memory, never stored
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How it works
- Paste both versions. Put the original on the left and the changed text on the right.
- Compare. Differences are highlighted line by line — additions and deletions.
- Tune it. Use Advanced options to ignore whitespace or case if needed.
About this tool
Paste two versions of some text and see precisely what changed — added lines in green, removed lines in red, unchanged lines in between. It uses a proper longest-common-subsequence diff (the same idea behind code diffs), so it lines up matching content instead of naively comparing line one to line one. Handy for spotting edits between drafts, config files, emails or any two snippets. Advanced options let you ignore surrounding whitespace and case so cosmetic differences don’t clutter the result.
What people use it for
- Spot edits between two drafts of a document
- Compare two config files or snippets
- See what changed in a pasted email or message
- Check differences without committing to git
Frequently asked questions
It runs a longest-common-subsequence diff on the lines, so matching lines are aligned and only the genuine additions and deletions are highlighted — not every line after the first change.
No. The diff is computed entirely in your browser, so nothing you paste is sent to a server.
Yes — Advanced options let you ignore leading/trailing spaces and case, so only meaningful changes show.
It compares line by line. A changed line shows as a removed old line plus an added new line, which is the clearest view for most text.
It’s bounded by your device — very large texts (tens of thousands of lines) use more memory but generally work.
Yes — client-side, no account, nothing stored or metered.
Yes. It runs in your browser, so Text Diff / Compare works on phones and tablets as well as desktop — there is no app to install.
Usually just a few seconds for a typical file — Text Diff / Compare starts working the moment you give it your input.
All modern browsers — Chrome, Safari, Firefox and Edge. Text Diff / Compare needs nothing installed beyond the browser you already use.