🧹 Duplicate Line Remover
Paste any list and instantly remove duplicate lines — or keep only the unique ones, or only the repeats. Ignore case & spaces, sort, and clean blanks. Free, private & no sign-up.
🔒 Your text is processed entirely in your browser — nothing is uploaded.
Clean Up Any List in Seconds
Powerful matching options and clear stats — built for tidying lists, data and logs.
Three Cleanup Modes
Remove duplicates, keep only unique lines, or keep only the repeated ones.
Smart Matching
Optionally ignore case and trim spaces so near-identical lines are caught.
Order Your Way
Keep original order, sort A→Z, and keep the first or last occurrence.
Live Stats
See input/output lines, how many were removed, duplicate groups and blanks.
Most Repeated
A panel shows which lines repeated most — spot the clutter instantly.
Instant & Private
Processed in your browser with copy, download and reuse-as-input. No sign-up.
How to Remove Duplicate Lines
Four steps — paste, choose, clean, copy.
Paste your text
Drop your list into the input — one item per line.
Pick a mode & options
Choose a cleanup mode and toggle case, spaces, blanks or sort.
Get the result
The cleaned text updates live right below the input.
Copy or download
Copy it, save a .txt, or reuse it as input to clean again.
Frequently Asked Questions
The three modes, ignoring case/spaces, order, the stats, size limits, privacy and uses.
How do I remove duplicate lines from text?
Paste your text into the input box — one item per line — and the de-duplicated result appears instantly below. By default it keeps one copy of each line in its original order. You can then copy the result, download it as a .txt file, or push it back into the input to clean it further. Nothing is uploaded; it all runs in your browser.
What's the difference between the three modes?
‘Remove duplicates’ keeps a single copy of every line (the usual cleanup). ‘Only unique’ keeps just the lines that appear exactly once and drops anything that was repeated. ‘Only duplicates’ does the opposite — it keeps one copy of each line that appeared more than once, which is handy for finding what's repeated.
Can it ignore case and extra spaces?
Yes. Turn on ‘Ignore case’ so ‘Apple’ and ‘apple’ count as the same line, and ‘Ignore spaces’ to trim leading and trailing whitespace before comparing, so ‘ hello’ and ‘hello ’ match. These are the two most common reasons duplicates slip through, so the tool trims spaces by default.
Does it keep the original order?
Yes — unless you turn on ‘Sort A→Z’, the kept lines stay in the order they first appeared. With ‘Remove duplicates’ you can also choose to keep the last occurrence instead of the first, which matters when later lines hold the version you want.
What are 'duplicate groups' and 'most repeated lines'?
A duplicate group is a line that appears more than once — the count tells you how many distinct lines had repeats. The ‘Most repeated lines’ panel shows which lines occurred most often and how many times, so you can see at a glance what's cluttering your list.
Is there a limit on how much text I can paste?
There's no fixed limit — it comfortably handles long lists of thousands of lines because it processes everything locally using fast in-memory sets. Extremely large pastes (hundreds of thousands of lines) may slow down the browser, but everyday lists are instant.
Is my text uploaded anywhere?
No. All the de-duplication happens in your browser — your text never leaves your device, nothing is stored, and there's no sign-up. It even works offline once the page has loaded.
What can I use it for?
Cleaning email or contact lists, tidying keyword and URL lists for SEO, removing repeated log lines, de-duplicating CSV columns, cleaning up exported data, and any time you have a list with accidental repeats. Pair it with the ‘Only duplicates’ mode to audit what's repeated before you clean.