🧹 Remove Duplicate Lines
Clean email lists, keywords, logs and CSV columns – keeps the first occurrence and the original order.
🔒 Runs in your browser · files never uploaded
0Lines in
0Lines out
0Removed
How to use the Remove Duplicate Lines tool
- Paste your list, one item per line.
- Choose case-insensitive, trim or ignore-empty options.
- Copy or download the unique lines.
Frequently asked questions
Which copy of a duplicate is kept?
The first occurrence. Later repeats are removed and the remaining lines keep their original order – nothing is sorted.
Why are "Apple" and "apple " not treated as duplicates?
By default "apple " has a trailing space, which trim handles, but case still differs. Tick Case-insensitive to treat them as the same line; the first spelling is kept.
How many lines can it handle?
Hundreds of thousands. Deduplication uses a hash set, so even a 10 MB list finishes in well under a second on a laptop.
Can I dedupe a column from Excel?
Yes. Copy the column, paste it here, then paste the result back – each cell becomes one line.