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
“The comparison uses the jsdiff library's diffWords algorithm, which computes the minimal edit path at word granularity. That provides finer detail than line-level diffing while staying less noisy than character-level comparison, and all processing happens locally in the browser.”
Text Diff Checker
Compare two versions of any text and see exactly what changed, highlighted word by word. Additions appear in green and removals in red with strikethrough, so edits in code, documents, and configuration files are easy to spot. The comparison runs entirely in your browser with no uploads.
- 1Paste the original text into the left editor panel labeled Version A.
- 2Paste the modified version into the right panel labeled Version B.
- 3Click Compare Now to run the word-level diff analysis.
- 4Read green highlights for added text and red strikethroughs for removed text.
- 5Scroll the unified result to review the full comparison in one place.
- 6Use Start New to clear both panels and compare a different pair of files.
- Word-Level Precision: Detects changes inside single lines instead of flagging whole lines.
- Color-Coded Output: Green for additions, red with strikethrough for removals, gray for unchanged text.
- Code-Friendly: Handles code snippets, Git patches, and config files without special setup.
- Local Processing: The comparison runs entirely in your browser.
- Responsive Layout: Side-by-side editors on desktop give way to a single unified view.
- Back-to-Top Button: Jumps to the input panels quickly on long comparisons.
Text Diff Checker Specs
Limits
- Word-level diff (not line)
- Two text blocks side-by-side
Formats
- Output: inline diff with add/remove highlights
Defaults
- Empty both sides
How it works
- jsdiff (diffWords)
Honest caveats
- Very large inputs (>100 KB) can be slow
- Binary files should be diffed at line level — word diff will be noisy
Real Ways People Use This
Code Review
Compare before and after versions of a function to confirm a refactor or bug fix changed only the intended lines.
Document Versioning
Track edits between drafts of contracts, proposals, or technical specifications before sharing them with reviewers.
Configuration Auditing
Diff environment variables, .env files, or deployment scripts to catch drift between staging and production.
Content Editing
Review a collaborator's rewrite of blog posts, documentation, or landing page copy word by word.
Data Sanity Checks
Verify that exported CSV or JSON files still match an earlier version after a schema change.
- Word-level diffing suits prose and code; binary files and very large documents are better handled by dedicated tools.
- The tool compares plain text only; there is no file upload option.
- Results are not saved or shared, so copy the output you need before leaving the page.
- 1Confirm both panels use the same formatting baseline so the diff is meaningful.
- 2Scan the output for unexpected additions or removals beyond the intended change.
- 3Copy the final text from Version B once the review is complete.