Diff Checker - Compare Two Texts Side by Side Online
Compare two texts side-by-side with color-coded line differences — added, removed, and unchanged.
Developer Tools
Tool
How to Use
1Paste original text in the left textarea
2Paste modified text in the right textarea
3Differences appear instantly with color-coded highlighting
4Green lines are additions, red lines are deletions, white lines are unchanged
5Stats show total lines added, removed, and unchanged
Frequently Asked Questions
Diff Checker compares two texts line by line and highlights the differences. Added lines are shown in green, deleted lines in red, and unchanged lines in white.
Yes. Diff Checker works with any plain text including source code, configuration files, JSON, HTML, CSS, and more.
The tool uses a Longest Common Subsequence (LCS) algorithm for accurate line-by-line comparison, the same approach used by Unix diff and git diff.
Yes. All text comparison happens locally in your browser. Your content is never uploaded to any server.