Compare two texts side-by-side and instantly see all differences highlighted in color. Detect additions, deletions, and changes character-by-character or line-by-line – entirely in your browser, no uploads needed.
Yes. Everything runs locally in your browser – no uploads, no servers, and no tracking. Your texts never leave your device.
Character-level diff highlights individual character changes, line-level diff highlights entire modified lines, and unified diff shows standard diff format.
Yes – the tool processes large documents efficiently in your browser without lag or memory issues, even for files with thousands of lines.
Red highlights removed or changed text, green highlights added text, and gray shows unchanged content. You can toggle highlighting on or off.
Yes – enable "Ignore whitespace" to skip space/tab differences, or "Ignore case" to treat uppercase and lowercase as the same.
Yes – copy the diff to your clipboard with one click, or download the results as a .txt file for sharing or archiving.
Compare original and modified text panels simultaneously for easy visual analysis of changes.
Red for deletions, green for additions, and neutral for unchanged text – instant visual clarity on every change.
Processing happens entirely in your browser. No uploads, no servers, no tracking – your texts stay completely private.
Drop the original text in the left panel and the modified version in the right panel.
Select character-level, line-level, or unified diff view. Toggle whitespace and case sensitivity options.
Instantly see color-coded differences. Copy the diff, download results, or swap texts to compare in reverse.
The Text Diff Checker instantly compares two versions of text and highlights every difference: additions in green, deletions in red, and unchanged content in neutral. Perfect for code reviews, document tracking, version control, content updates, and legal document revisions.
| Mode | Best for | Shows |
|---|---|---|
| Character-level diff | Word and phrase changes | Individual character modifications with precision |
| Line-level diff | Code and structure changes | Entire lines marked as added, removed, or modified |
| Unified diff | Developer workflows | Standard diff format for git and version control |
| Option | What it ignores | Use case |
|---|---|---|
| Ignore whitespace | Spaces, tabs, newlines | Code reformatting, indentation changes |
| Ignore case | Uppercase vs. lowercase | Case-insensitive comparisons |
| Show line numbers | – | Navigate and cite specific lines |
| Highlight changes | – | Color-coded visual diff display |
| User | Task | Benefit |
|---|---|---|
| Developers | Code review before merge | Spot bugs and style issues instantly |
| Content teams | Track editorial updates | See exactly what changed between drafts |
| Legal teams | Document version tracking | Audit and compare contract revisions |
| QA & Testing | Compare expected vs. actual output | Identify unexpected changes in test results |
Tip: Use line-level diff for large documents and character-level diff for detailed phrase-by-phrase analysis. Toggle "Ignore whitespace" to focus on content changes rather than formatting.
Compare two blocks of text to spot changes, regressions, or copy updates instantly—ideal for editors, engineers, and QA teams.
Highlights additions, deletions, and modifications between two text inputs with clear, side-by-side context.
Move between other text utilities to prepare and export your content.