Remove Duplicate Lines
Remove Duplicate Lines removes repeated lines from a list, free and in your browser. You paste a list, and the tool keeps only the first occurrence of each line, in order.
Last updated: 30 October 2026 · Free · No signup
Duplicate lines creep into lists when data is copied from several sources, when a spreadsheet is merged, or when a list is edited over time. They cause double counting, duplicate emails, and wasted work. Removing them by hand in a long list is slow and easy to get wrong, because the eye misses repeats that are far apart. This tool checks every line and keeps the order of the first occurrence.
Check whether capitalisation matters for your list before you remove duplicates. A line that differs only by capital letters may be treated as different or as the same, depending on the option you choose, so pick the option that matches how strict your list needs to be.
Privacy: this tool runs entirely in your browser — no upload, no signup, and your files never leave your device.
Remove repeated lines from a list, names or data — every line survives only once, and the order stays exactly the same.
Input list
Clean list (output)
How to use Remove Duplicate Lines
- Paste your list into the box, one item per line.
- Choose whether capitalisation should matter.
- Remove the duplicate lines.
- Copy or download the cleaned list.
Key facts
| Input | A list, one item per line |
|---|---|
| Output | The same list, with repeats removed, in order |
| Upload | None — cleaning happens in your browser |
Frequently asked questions
Does Remove Duplicate Lines keep the original order?
Yes. It keeps the first occurrence of each line, in the order it first appeared, and removes later repeats. The cleaned list therefore stays in the same order as your original list, just shorter.
What counts as a duplicate line?
A line that is exactly the same as an earlier line, apart from the capitalisation option you choose. Lines that differ by even one character, a space, or punctuation are treated as different lines.
Can I remove duplicates from a very long list?
Yes, for normal list lengths the tool handles it in the browser. Extremely long lists may take a moment, so wait for the cleaned result before copying it.
Is my list uploaded when I clean it?
No. Cleaning happens in your browser only. Nothing is sent to a server and nothing is saved after you close the page.