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About Diff Checker
How Text Diff Works
Diff algorithms compare two pieces of text line by line and identify what's been added, removed, or changed.
It's the same idea behind git diff, but you don't need a repo — just paste any two texts.
Practical Uses
- Code review — Compare before-and-after versions of a function when you don't have git handy
- Document comparison — Spot changes between two drafts of a document or email
- Configuration changes — See what was modified in server configs, environment files, or deploy scripts
- Debugging — Compare expected vs. actual output to pinpoint where your code diverges
The diff is rendered with green and red highlighting — green for additions, red for deletions — just like you'd see in a pull request. For structured JSON comparison, try the JSON Diff tool which understands key ordering.
Frequently asked questions
Does the diff checker send my text anywhere?
No. Both texts are compared locally in your browser, so you can safely diff private code or documents.
What kind of diff does it show?
It highlights additions, deletions, and changes line by line, similar to a git diff.
Can I compare code?
Yes — paste any two text or code snippets and the tool highlights the differences between them.