Comparing and deduplicating lists of lines
Find duplicates, the difference or the intersection of two lists: addresses, redirects, emails, identifiers. Paste the data into the fields or drop a file in — the computation runs in your browser, with nothing sent to a server.
The data never leaves your browser — the computation runs locally, with nothing sent to a server.
Which operations are available
Deduplication — each line is kept once, in order of first appearance. Duplicates only — lines that occur twice or more. Frequency list — how many times each line occurs. A \ B — present in the first list and absent from the second. A ∩ B — present in both. A ∪ B — both lists together, without duplicates. A △ B — present in exactly one of the lists. The “odd number of occurrences” mode is listed separately: that is how the old tool behaved, and for two lists without internal repeats it matches A △ B.