🔒 Runs in your browser – nothing is uploaded
Text Diff Checker
Text Diff Checker: free, fast and private. Works in your browser, nothing is uploaded, no sign-up needed.
How to use
Compare two pieces of text and see exactly what was added, removed or left unchanged, line by line. Optionally ignore whitespace or letter case. It is useful for reviewing edits, comparing configuration files and checking code changes without installing anything.
- Paste or type your input.
- Adjust the options.
- Copy the result.
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Frequently asked questions
How does the comparison work?
It finds the longest common sequence of lines and marks the lines that differ as added or removed.
Is my text uploaded?
No. The comparison runs in your browser.
Is it free?
Yes. All tools are free, with no sign-up and no limits.
Is my code or data uploaded?
No. Everything runs locally in your browser, so your code and data stay private.
Does it work on mobile?
Yes. It works in any modern mobile or desktop browser.