Remove Duplicate Lines
Remove duplicate lines from a list and keep only the first appearance of each, in the original order. Toggle case sensitivity and see how many lines were removed. A free deduplicator that runs in your browser, with nothing uploaded.
Remove duplicate lines from a list and keep only the first appearance of each, in the order you pasted them. This duplicate line remover is built for cleaning email lists, keyword lists and log exports before you use them elsewhere. Paste your lines, choose whether matching ignores case or trims spaces, and copy the deduplicated result. It tells you how many lines were removed so you can see what changed.
- No sign-up, ever
- 100% free
- Nothing uploaded
- Works offline after first load
- No limits, no email wall
How to use it
- 1
Paste your lines
Drop in a list, one item per line.
- 2
Choose your options
Decide whether matching should be case-sensitive and whether to trim surrounding spaces before comparing.
- 3
Get the clean list
Duplicates are removed in place, the order is preserved, and you see how many were taken out.
When it comes in handy
Mailing and contact lists
Strip repeated email addresses or names before importing into a tool that charges per contact.
Keyword and tag lists
Clean a list of keywords, tags or URLs so each one appears only once.
Log and data tidying
Collapse repeated lines from logs or exports into a unique set you can actually read.
Instant & 100% private — nothing is uploaded
Every keystroke is handled right here in your browser. Your text is never sent to a server, so there is no sign-up, no email wall, and no length cap from us. Load the page once and it keeps working even if you go offline.
Frequently asked questions
- Does it keep the original order?
- Yes. The first time each line appears is kept exactly where it was, and only the later repeats are removed. So a list of "cat, dog, cat, bird, dog" becomes "cat, dog, bird" without reordering. This is different from sort-and-dedupe, which would rearrange everything.
- What does the case-sensitive toggle change?
- With case sensitivity off, "Apple" and "apple" count as the same line and only one is kept. With it on, they are treated as different lines and both survive. Choose based on whether capitalisation is meaningful in your data.
- Are blank lines and spacing handled?
- You can trim leading and trailing spaces before comparing, so lines that differ only by stray spacing are treated as duplicates. Blank lines can be kept or collapsed depending on the option you pick, so the result is as tidy as you want.
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