Text & Writing
Duplicate Line Remover
Duplicate Line Remover scans a list or block of text and strips out repeated lines, keeping only the first occurrence of each. It's the fastest way to deduplicate a list of emails, URLs, keywords, or any other line-based data without opening a spreadsheet.
It's built for anyone cleaning up exported lists, log files, or copy-pasted data from multiple sources. Since it runs as plain JavaScript in your browser tab, your list is processed instantly and never uploaded to any server.
How to Use the Duplicate Line Remover
- Open the Duplicate Line Remover tool.
- Paste in your list of lines.
- Choose whether matching should be case-sensitive.
- Copy the deduplicated result.
Frequently Asked Questions
Does it keep the first or last occurrence of a duplicate?
It keeps the first occurrence of each line and removes any repeats that come after it, preserving your original order.
Is duplicate detection case-sensitive?
You can toggle case sensitivity, so "Apple" and "apple" can be treated as either the same line or different ones.
Is my list uploaded anywhere?
No, deduplication happens entirely client-side in your browser, so your list never touches a server.