Developer Tools
Diff Checker
Use our free Diff Checker to compare two texts side by side and find differences. Highlights additions, deletions, and changes line by line.
Compare Two Texts Side by Side
Paste two versions of text to find differences line by line. Green = added, Red = removed, Gray = unchanged. All processing runs in your browser.
How to Use
- Paste the original text on the left
- Paste the modified text on the right
- Optionally ignore case or whitespace
- Click Compare to see differences
- Red lines = removed, Green = added
Common Use Cases
- Compare code versions
- Review document edits
- Check config changes
- Verify copy accuracy
- Find text differences
- Debug data changes
FAQ – Diff Checker
What is a diff?
A diff (difference) shows the changes between two versions of text. It highlights what was added, removed, or changed line by line.
How does the comparison work?
The tool compares texts line by line. Lines present only in the original are marked as removed (red). Lines only in the modified version are marked as added (green). Matching lines are shown in gray.
What does "ignore case" do?
When enabled, "Hello" and "hello" are treated as identical. Useful when case differences don't matter for your comparison.
Can I compare code?
Yes. The monospace font preserves indentation. Works well for comparing code, configs, JSON, XML, or any structured text.
Is my data safe?
Yes. All comparison happens in your browser. Nothing is sent to any server.
Is there a size limit?
No hard limit, but very large texts (10,000+ lines) may be slow in the browser. For huge files, use a dedicated diff tool like VS Code or git diff.