Text Diff Checker Online
The best online diff tool. Compare two text files, code snippets, or configurations and highlight differences instantly with word-level precision.
Original Text (Version A)
Modified Text (Version B)
Built With Care
“Text diffing is essential for code review, document versioning, and configuration auditing. This tool uses the jsdiff library's diffWords algorithm, which provides word-level granularity — more precise than line-level diffing but less noisy than character-level. For large files, consider using command-line tools like git diff or diff-so-fancy.”
Text Diff Checker
Compare two text files, code snippets, or configurations and highlight differences instantly with word-level precision. This free online diff tool helps developers spot changes between document versions without installing software.
- 1Input your original text (Version A) into the left editor panel.
- 2Paste the modified version (Version B) into the right editor panel.
- 3Click 'Compare Now' to run the algorithmic analysis.
- 4Review the high-contrast highlights: Green for new text, Red for deletions.
- 5Use the 'Start New' button to clear both inputs and begin a fresh comparison.
- Word-Level Granularity: Detects changes even within single lines for high-precision diffing.
- Smart Highlighting: Uses distinct semantic coloring to make differences leap off the page.
- Code-Friendly: Perfect for comparing Git patches, configuration files, and code snippets.
- No Data Transfer: Performs all comparisons locally in your browser.
- Responsive Layout: Side-by-side mode on desktop switches to a unified view for simple review.
Real Ways People Use This
Code Review
Compare before/after versions of code snippets to identify exactly what changed during a refactor or bug fix.
Document Versioning
Track changes between drafts of legal contracts, proposals, or technical specifications.
Configuration Auditing
Compare environment configs, .env files, or deployment scripts to find drift between environments.
Content Editing
Review edits made by collaborators on blog posts, documentation, or marketing copy.
- Word-level diffing is ideal for prose and code — for binary files or very large documents, use a dedicated tool.
- Results are not saved or shared — refresh the page to start a new comparison.
- 1Paste the original text in Version A and the modified text in Version B.
- 2Click Compare and review the green (added) and red (removed) highlights.
- 3Use Start New to reset and compare different versions.