List Diff & Compare
Paste two lists to see highlighted line-by-line differences, a change summary, and a similarity percentage. Everything is processed on your device.
Everything runs in your browser. Your data is never sent to our servers.
Example
Example Input
two item lists
Example Output
unique items per list highlighted
How to Use
- 1Paste the first lists (A) in the left box and the second (B) in the right box.
- 2Adjust the options if needed (ignore case, whitespace, or empty lines).
- 3Click Compare (or press Ctrl+Enter).
- 4See the highlighted differences, a summary of how many changes there are, and the similarity percentage. Switch between side-by-side / unified / inline views.
About List Diff & Compare
List Diff & Compare compares two lists (one item per line) and shows which items are only in A, only in B, or in both. Useful for comparing lists of emails, IDs, URLs, or any entries.
Enable the ignore-case or trim-edges options so formatting differences are not treated as different items.
FAQ
What is the difference between "diff" and "compare"?
Both are done by the same tool. "Diff" highlights the lines/parts that changed (added/removed), while "compare" shows how similar the two inputs are (similarity percentage + summary). You get both at once here.
Is my data sent to a server?
No. The entire comparison is computed in your browser with JavaScript. Nothing is uploaded, logged, or stored on our servers — safe for sensitive data.