List Comparer
Compare two lists to find common, unique and combined items.
Paste two lists (one item per line) to instantly see what is only in list A, only in list B, in both, or the combined set — each deduplicated. Toggle case sensitivity to match how you need. Great for reconciling emails, IDs, SKUs or keywords. Everything runs locally in your browser.
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Formula & methodology
Each list is split into lines, trimmed and de-duplicated, then compared as sets: only-A, only-B, intersection (common) and union (combined).
Worked example
- A: apple, banana, cherry — B: banana, cherry, date → Only A: apple · Only B: date · Common: banana, cherry
Frequently asked questions
Are duplicate lines counted?
No. Each list is de-duplicated first, so repeated lines are treated as a single item.
Is the comparison case-sensitive?
By default yes, but you can turn on case-insensitive matching so Apple and apple are treated as equal.
Privacy
All processing happens locally in your browser. Your data is never uploaded.