Compare Text — QA & Testing
See every line that changed between two blocks of text or files (.txt, .md, .xml, .html, .sql). Free, no account needed.
How to compare text
- Paste your first text block into the left panel.
- Paste the second version into the right panel.
- Every changed line is highlighted instantly — additions in green, removals in red.
Key features
- LCS diff algorithm — accurate line-by-line change detection
- Additions in green, deletions in red, unchanged lines shown for context
- Ignore-whitespace toggle for format-only changes
- Free — no account or payment required
Common uses
- Compare test case descriptions between specification versions
- Diff log output between two test runs to isolate what changed between builds
- Review what changed in error messages or stack traces between software versions
Frequently asked questions
How do I compare text online?
Paste your first text block into the left panel. Paste the second version into the right panel. Every changed line is highlighted instantly — additions in green, removals in red.
Are my files private when I use this tool?
Yes. All comparison runs locally in your browser. Your files never leave your device and are never sent to any server — not a policy promise, but an architectural fact. There is no server receiving your data.
No AI means no hallucinations
Compare Files uses a deterministic, logic-based engine — not a language model. It reports every change that is actually in your files, and never invents one.
Your files never leave your device. Everything runs in your browser — no uploads, nothing stored.
No AI, so no hallucinations. A deterministic engine reports every real change and never invents one.
No upload, no server wait. Comparisons run locally and keep working offline once the page has loaded.