Remove Duplicate Lines
Delete repeated lines from a list and keep the first of each — with case and space options.
Runs in your browser — your data never leaves your device.
About the Remove Duplicate Lines
Paste a list — customer phone numbers, email addresses, keywords, product codes — and every repeated line is removed instantly. The first occurrence of each line is kept, in its original order.
Options let you treat Apple and apple as the same, ignore stray spaces at the start or end of lines, and drop empty lines.
How to use the Remove Duplicate Lines
- Paste your list, one item per line.
- Choose the options you need.
- Copy the cleaned list or download it as a .txt file. The counter shows how many duplicates were removed.
How it works
Each line is compared with the lines before it (after trimming spaces and lower-casing, if those options are on). A line is kept only the first time it appears.
Examples
apple, banana, Apple, cherry, banana(one per line) → apple, banana, cherry — 2 duplicates removed.- 1,200 exported phone numbers → 1,038 unique numbers.
Frequently asked questions
Is my text sent to your server?
No. Everything runs in your browser, on your own device. Nothing you type or paste is uploaded or stored.
Will the order of my list change?
No. Lines stay in their original order; only repeats are removed. Use Sort Lines if you also want them in order.