Remove Duplicate Lines
Remove duplicate lines, keep the first / last / count occurrences.
- Text
- Free to use
- Runs in your browser
Your input
Set your options
Run Remove Duplicate Lines
Private by default. Runs entirely in your browser — files never uploaded.
Three steps
How to use Remove Duplicate Lines
- Step 01
Pick your input
Paste your text into the box above.
- Step 02
Configure & run
Adjust the options (keep, case insensitive) and click Run. Everything happens in your browser via WebAssembly.
- Step 03
Download the result
The result appears below the form. Copy it with one click.
This tool runs entirely in your browser. Your file is never uploaded to our servers.
About remove duplicate lines
Remove duplicate lines, keep the first / last / count occurrences. It sits in the text shelf alongside 25 other text tools, needs no account, and keeps the same behaviour whether you open it here or call it through the REST API.
It works from what you type in rather than a file and gives back plain text you can copy. The work happens in your browser, so nothing is sent to us at all and the tool keeps working offline. The same operation is available programmatically at POST /v1/text/dedupe-lines.
Remove Duplicate Lines questions
Does Remove Duplicate Lines upload my file?
No. Remove Duplicate Lines runs as WebAssembly inside this browser tab: the file is read from your disk by the page, processed on your own machine, and handed straight back. It is never sent anywhere, so there is nothing for us to store or delete.
Do I need an account to use Remove Duplicate Lines?
No. Remove Duplicate Lines works without signing in, and that is not a trial — it is how the free tier works. An account only matters for things that need one to exist at all: larger server jobs against your quota, API keys, saved workflows and billing.
Can I run Remove Duplicate Lines from my own code?
Yes. Every tool on the site is reachable from the REST API with the same slug — `dedupe-lines` — and the same options as this page, so anything you can do here you can automate against your own files.