Text Diff Checker
Compare two blocks of text line by line and see exactly what changed.
0
Added
0
Removed
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Unchanged
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How to use Text Diff Checker
- 1Paste the original text on the left and the changed text on the right.
- 2Choose whether whitespace and letter case should affect matching.
- 3Review additions, removals and unchanged lines in the unified result.
- 4Copy the plain diff summary when you need to share it.
Review line changes without uploading private text
A text diff checker highlights the lines that were added, removed or left unchanged. It is useful for copy revisions, configuration reviews, list cleanup and small code comparisons.
The algorithm compares lines, not individual characters. Use Git or a dedicated merge tool when you need repository history, conflict resolution or syntax-aware changes.
Frequently asked questions
How does the text diff work?
It compares lines with a longest-common-subsequence algorithm, then marks removed, added and unchanged lines while preserving their order.
Can it compare code and configuration files?
Yes. Paste text from code, logs, lists or configuration files. For large repositories or syntax-aware merges, use a version-control diff tool.
What does Ignore whitespace do?
It trims line edges and treats consecutive whitespace characters as equivalent during matching. The displayed lines still show the original text.
Is the text uploaded?
No. Comparison runs in your browser.
How large can the comparison be?
This page is optimized for quick reviews and limits each side to 500 lines. Larger files are better handled with Git or a streaming desktop diff application.