Text Diff Checker
Compare two texts and highlight the differences. Shows additions, deletions, and unchanged content side by side.
What is a Text Diff Checker?
A text diff checker compares two versions of text and highlights exactly what has been added, removed, or left unchanged between them.
Diff checking is a standard technique in software development, but writers, editors, lawyers, and translators use it just as much. Any time a document goes through revisions, a diff checker shows what changed at a glance, without reading both versions in full. This tool uses the same algorithm as version control systems like Git to detect changes at the word or line level.
How to Use Text Diff Checker
- 1Paste the original (old) version of your text in the left box.
- 2Paste the revised (new) version in the right box.
- 3Choose between 'Word diff' and 'Line diff' mode.
- 4Click 'Compare' to see highlighted differences.
- 5Green highlights show added text; red strikethrough shows removed text.
Features
- ✓Word-level diff for precise change detection
- ✓Line-level diff mode for comparing documents line by line
- ✓Additions highlighted in green, deletions in red with strikethrough
- ✓Count of additions, deletions, and unchanged sections
- ✓All comparison runs locally. Your text is never transmitted
Common Use Cases
Contract revision review
A lawyer receives a revised 8-page contract. Instead of reading it twice, they paste both versions into the diff checker and see 6 changed clauses highlighted in seconds.
Blog post edit history
An editor compares an article before and after a writer's revisions, immediately seeing that 3 paragraphs were rewritten and 1 section of 120 words was cut entirely.
Translation verification
A translator checks their revised translation against the previous version to confirm exactly 4 terminology changes were made without accidentally altering surrounding sentences.