Remove Duplicate Lines
Delete duplicate lines from any text while keeping the first occurrence and order.
About this tool
Delete duplicate lines from any text while keeping the first occurrence and order. Your data never leaves your browser. Client-side processing with zero waiting. No accounts, no paywalls, no watermarks.
How to use
- 1
Type or paste your data in the input box
- 2
Choose your options and run the tool
- 3
Copy or download the result — done!
Frequently asked questions
▸Which occurrence is kept when a line repeats?
The first one. We walk the text top to bottom, keep the first copy of each line and drop the later ones, so the original order stays intact unless you turn on sorting.
▸How do trimming and case-insensitive mode change the result?
Trimming removes leading and trailing spaces before comparing, and case-insensitive mode treats Apple and apple as the same line. Both only affect matching — the kept line is shown as it appears in your text.
▸Is there a size limit, and is my text uploaded?
There is no fixed limit — it runs on your device, so long lists are fine. Nothing is uploaded: the whole dedupe happens in your browser, which makes it safe for logs, keyword lists and customer data.