Online Diff Checker
A free, browser-based diff tool: paste two texts, get a colored diff and a change count. Nothing installed, nothing uploaded.
Overview
A diff checker should be instant and private — no install, no account, no upload. This loads two short lists and shows the classic diff output: added lines, removed lines, and what stayed, with a mechanical count. Everything runs in your browser, so the text you compare never leaves your machine. It is the plain, reliable online diff — paste, compare, read — that shows what changed and leaves the interpretation, as always, to you.
Workflow
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Paste two texts
No install, no account — just paste and go.
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Get the diff
Added, removed, and unchanged lines with a count.
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Stay private
Everything runs in your browser; nothing is uploaded.
Why This Works
- A diff checker should be instant, free, and require no setup
- Browser-based means the compared text never leaves your machine
- Classic diff output: added, removed, unchanged, with a count
Best for
- A quick, private text diff
- No-install, no-account comparison
- Everyday diff checking
Not for
- Semantic prompt-revision analysis — that's the Prompt Version Diff
- Quality comparison — that's the Prompt Comparator
Use cases
- A quick, private text diff
- No-install, no-account comparison
- Everyday diff checking