Remove Duplicate Lines
Free tool to remove duplicate lines from a list. Dedupe, trim, sort and clean any list with case-insensitive and blank-line options — instantly and privately in your browser.
🔒 Everything runs in your browser — your list is never uploaded.
Free Remove Duplicate Lines Tool
This free online tool helps you remove duplicate lines from any list in seconds. Paste your text on the left and a clean, deduplicated version appears instantly on the right. You can ignore letter case, trim spaces, skip blank lines, sort the result alphabetically, or flip it around to keep only the duplicates. It’s free, needs no sign-up, and runs entirely in your browser.
How to use this tool
- Paste your list into the box on the left, one item per line (or click Load sample).
- The deduplicated result appears on the right and updates live as you type.
- Tick the options you need — case-insensitive, trim whitespace, ignore or remove blank lines, or sort A–Z.
- Use Keep only duplicates if you instead want to see which lines were repeated.
- Click Copy result to copy the clean list to your clipboard.
When is this useful?
Duplicate lines creep into data more often than you’d think. If you are cleaning email lists before a campaign, removing repeats keeps you from messaging the same person twice and protects your sender reputation. SEO and marketing teams use it to deduplicate keyword lists pulled from several tools, so each term is counted once. Developers and analysts dedupe log files to collapse repeated error lines, or clean up a single CSV column after pasting it out of a spreadsheet.
The stats line tells you exactly what happened — how many lines went in, how many unique lines came out, and how many duplicates were removed — so you can trust the result before you copy it. Because everything runs on your own device, even very large lists are processed instantly and your data never leaves your computer.