Text Diff Checker
Compare two texts and find differences
This free online text diff checker runs in your browser and is part of our Text Tools collection.
📝 Text Diff Checker
Compare two texts and highlight differences
⚡
Instant In-Browser Execution
Runs locally in JavaScript without wait times or server delays.
🔒
100% Privacy & Security
Your inputs and files are never stored or logged on remote servers.
📱
Cross-Device Responsive
Fully optimized for mobile smartphones, tablets, and desktop displays.
🎉
100% Free Forever
No subscription fees, no signups, and no software installations.
How to Use the Online Text Diff Checker
1
Paste Original Text
Paste the reference or base version of your text or code in the Left editor panel.
2
Paste Modified Text
Paste the updated or revised version of the text into the Right editor panel.
3
Select Comparison Mode
Choose between "Line by Line" comparison or granular "Word by Word" character diff.
4
Inspect Visual Diff View
Review the colored comparison: removed text is highlighted in red with strikethrough, and newly added text is highlighted in green.
Frequently Asked Questions
Common questions about using this free online text diff checker.
What diff algorithm is used under the hood? ▾
The diff engine uses the Myers Difference Algorithm (the same mathematical algorithm powering `git diff`), finding the shortest edit script between sequences.
Can I ignore whitespace or case differences? ▾
Yes. You can toggle checkboxes to ignore trailing spaces, ignore line break differences (CRLF vs LF), or ignore uppercase/lowercase variations.
Is this tool suitable for comparing code files? ▾
Yes. It works with HTML, JavaScript, Python, JSON, CSS, and markdown files, making it easy to identify code changes before committing.
Does this tool transmit my confidential text to a cloud server? ▾
No. All diff comparisons execute 100% locally in your web browser. Proprietary contracts and code never leave your computer.
More Text Tools
Explore related tools in the same category to solve adjacent tasks faster.