Remove Duplicate Lines
Remove repeated lines from any text — lists, keywords, URLs, or IDs. Keeps the first occurrence. 100% browser-based, no upload.
Input
How to remove duplicate lines
- Paste your text — a list, keywords, URLs, or any line-separated content.
- Choose options: case-sensitive comparison, trim whitespace, or keep empty lines.
- Click Remove Duplicates to get a clean, deduplicated list.
- Copy the result or download it as a
.txtfile.
Privacy — processed in your browser
All deduplication runs entirely in your browser. Your text is never sent to any server, stored, or shared. This browser-based duplicate line remover is safe for private, sensitive, or proprietary content.
Frequently Asked Questions
Does this upload my text?
No. All processing runs inside your browser tab using JavaScript string operations. No network request is made and your text never leaves your device.
Does it keep the first duplicate line?
Yes — the tool keeps the first occurrence of each line and removes subsequent repeats. The original order of unique lines is preserved.
Can I ignore case when removing duplicates?
Yes — disable "Case-sensitive" to treat "Apple" and "apple" as duplicates. With case-sensitive on (the default), they are kept as distinct lines.
Can I remove duplicate URLs, keywords, or IDs?
Yes — paste one URL, keyword, or ID per line and click Remove Duplicates. The tool works on any line-separated list regardless of content type.
What is the difference between removing duplicate lines and sorting lines?
Removing duplicate lines filters out repeated entries while preserving the original order. Sorting lines reorders all lines alphabetically without removing any. Use Remove Duplicates first, then Sort Lines if you need both.