Diff Checker
Dictation needs Chrome, Edge, or Safari.
Dictation needs Chrome, Edge, or Safari.
What is a Diff Checker?
A diff checker (or text comparison tool) highlights the differences between two blocks of text. Developers use it to compare code versions, writers use it to track edits between drafts, and legal professionals use it to identify changes in contracts. It's one of the most versatile tools in any developer's toolkit.
How to Use This Diff Checker
- Paste your original text in the left panel and the modified text in the right panel.
- The tool automatically highlights additions in green, deletions in red, and unchanged lines are shown for context.
- Use the Swap button to flip the left and right panels if you pasted them in the wrong order.
- Review the summary at the top showing the count of lines added, removed, and unchanged.
Frequently Asked Questions
Does this tool store my text?
No. All comparison happens in your browser. Your text is never sent to any server or stored anywhere.
Can I compare code files?
Yes. The diff checker works with any text — code (JavaScript, Python, HTML, CSS, JSON), prose, configuration files, and more.
What's the difference between inline and side-by-side mode?
Side-by-side mode shows both texts in separate panels with differences highlighted. Inline mode shows a single unified view with additions and deletions interleaved. Side-by-side is better for reading; inline is better for copy-pasting the result.