Text Diff Checker
Compare two text blocks side by side, review line-level additions and removals, and copy a unified patch without leaving the browser. Keep the wide layout, but tighten the workflow around real submissions and clean rehydration.
Compare texts
Paste the original text on the left and the updated version on the right to generate a line-aware diff.
Side-by-side diff
Added and removed lines appear side by side with line numbers.
Submit the form to see added and removed lines side by side.
Diff summary
Track similarity and line-level changes at a glance.
Similarity
0%
Based on line-aware comparison
Lines compared
0 original · 0 modified
Includes blank lines after normalization
Added
+0
Removed
-0
Unchanged
0
Patch output
Drop this unified diff into tickets or code reviews.
--- Original +++ Modified
Tips
Small tweaks that lead to clearer diffs.
- Paste the before text on the left and the updated text on the right for clearer context and numbering.
- Enable whitespace trimming to ignore stray spaces, then toggle it off if indentation matters.
- Use the patch output above to drop diffs into tickets, PRs, or documentation without exporting files.
Documentation
Text Diff Checker
About this tool
Text Diff Checker compares two text blocks side by side and shows what changed. Use it when reviewing copy, configuration snippets, notes, or patches before sharing them.
Key option
Whitespace sensitivity controls whether spaces, tabs, and blank-line differences are treated as meaningful changes.
Turn it on for code, config, and formatting reviews. Turn it off when you only care about wording changes.
Gotchas
Paste each version on the correct side before running the comparison. Reversed input can make additions and removals look backwards.
Whitespace-only changes can create noisy diffs when sensitivity is enabled.
Key use cases
- -Compare two drafts line by line.
- -Review added, removed, or changed text.
- -Copy a unified diff for handoff.
- -Check whether whitespace changes should count.