The Myers diff algorithm — the same family used by git diff and Unix diff. It finds the minimal set of changes rather than a naive line-by-line comparison.
Free Developer Tool
Diff Tool — Text Comparison
Compare two blocks of text line-by-line, with word-level highlighting on
changed lines. Perfect for comparing config files, code snippets,
.htaccess versions, or any two pieces of text.
- ✔ Line & word-level diff
- ✔ Side-by-side & unified views
- ✔ Ignore whitespace/case options
- ✔ Change statistics
- ✔ Free Forever
Compare Two Blocks of Text Instantly
Whether you're comparing two versions of a config file before deploying, reviewing what changed in a code snippet, or checking the difference between two drafts of copy, a visual diff is far faster than reading line by line. This tool uses a proper LCS-based diff algorithm (the same family of algorithm used by
git diff and Unix diff)
to find the true minimal set of changes, then highlights word-level differences within
changed lines for even finer detail.
How It Works
1. Paste Both Texts
Paste the original in the left box, the changed version in the right.
2. Set Options
Ignore whitespace or case differences if they're not meaningful to you.
3. Compare
See line-by-line changes with word-level highlighting on modified lines.
4. Review Stats
Get a quick summary of lines added, removed, and unchanged.
Original
0 lines
Changed
0 lines
FAQsDiff Tool
What diff algorithm does this tool use?
What does word-level highlighting show?
For modified lines, it highlights exactly which words changed within the line rather than marking the whole line as different — much faster to spot a single changed value.
Is my text uploaded anywhere?
No. Comparison happens entirely in your browser using JavaScript. Nothing you paste is sent to any server.