FREE BROWSER TOOL
Free Prompt Diff Checker
Paste two prompts, see exactly what changed — additions and removals highlighted.
- Data never uploads to a server
- Free, no sign-up, no watermark
- Runs offline after loading
Paste two prompts and compare — changes are highlighted inline.
A — removed parts
B — added parts
How to compare two prompts
- Paste both prompts — the original on the left, the revision on the right.
- Pick a granularity. Word level suits normal reading; character level exposes small edits like weight changes
:1.2. - Compare. Panel A shows what was removed; panel B shows what was added.
Word vs character mode
Word level
Best for seeing which descriptors were swapped, added or dropped — “cinematic lighting” → “soft light” reads as a clean pair.
Character level
Exposes tiny edits inside words: weight numbers <code>1.2→1.5</code>, comma tweaks, punctuation.
Private by design
Prompts are compared in your browser tab — nothing is sent anywhere, so drafts stay drafts.
Frequently asked questions
How do I compare two prompts?
Paste the old version on the left and the new on the right, hit Compare — green marks additions, red marks removals.
Does it handle Chinese prompts?
Yes — English is tokenized by word, CJK text by character, mixed input handled automatically.
Can I save the result?
Screenshot the result or copy the marked-up text straight out.
How is it different from a code diff?
Same diff algorithm, but tuned for prose — inline word highlighting instead of line-based output.
Is text uploaded?
No — comparison runs entirely in your browser.