Diff Checker
Paste two versions of text or code and see exactly what changed — added lines in green, removed lines in red, line by line. It all runs in your browser.
Paste two versions above to see the line-by-line difference.
Runs in your browser. Your input is not uploaded to PayloadIQ.
See the change, not the whole file
Drop the original on the left and the new version on the right. The checker lines them up with a longest-common-subsequence diff — the same approach version-control tools use — and highlights only what moved: green for additions, red for removals. Toggle off whitespace or case differences when you only care about real content changes.
Private by default
Unlike many online diff tools, nothing is sent to a server. The comparison happens locally, so you can diff production config, code, or sensitive copy without it leaving your machine.
FAQ
Is my text uploaded to compare it?
No. The diff is computed in your browser with a longest-common-subsequence algorithm. Both versions stay on your device — safe for code, contracts, and anything private.
What do the colors mean?
Green lines with a + were added in the second version, red lines with a − were removed from the first, and unhighlighted lines are unchanged.
Can it ignore formatting differences?
Yes. Toggle 'Ignore whitespace' to skip indentation and spacing changes, and 'Ignore case' to treat uppercase and lowercase as equal.