Free Online Text Diff Comparator
Our Online Text Diff Comparator tool is completely free and works directly in your browser. Compare two texts line by line and see differences in color: additions and deletions. No signup required, no data sent to any server.
How to use this tool?
Simply fill in the fields above and the result appears instantly. Our online text diff comparator supports diff, compare, text, line. The tool is optimized for both mobile and desktop.
Why use SmartGap Tools?
SmartGap Tools offers over 30 free online tools. Also check out: Word Counter, JSON Formatter. All our tools are fast, free and privacy-friendly.
What is a text diff tool?
A diff comparator analyses two texts and highlights exactly what was added, removed or changed. It works line by line, showing additions in green and deletions in red. This is the same algorithm used by Git and code review tools.
When to use an online diff
- Code review: compare two versions of a file to spot changes.
- Document editing: find differences between contract drafts or policy updates.
- Configuration files: detect unexpected changes in server or application configs.
Frequently Asked Questions
How do I compare two texts online?
Paste the original text on the left and the modified text on the right, then click Compare. Additions appear in green and deletions in red.
Can I use this diff tool for code?
Yes, it works for any plain text including source code, configuration files, JSON and Markdown. It compares line by line, just like Git diff.
What is a diff checker?
A diff checker compares two versions of a text and highlights what was added, removed or changed. It is commonly used in software development and document review.
Is this online diff comparator free?
Yes, completely free with no sign-up. All comparisons run locally in your browser; no text is uploaded.
Does the tool show line numbers?
The tool highlights differences by line. Additions and deletions are color-coded so you can spot changes at a glance.