Remove Duplicate Lines
Remove duplicate lines from a list.
▶About this tool
This tool removes duplicate lines in one click. Three features: 1) Enter text (one item per line) to dedupe, 2) Choose keep first or last occurrence, 3) All processing in browser—no data sent to server. Ideal for email and URL list cleanup.
Tool interface
Usage
- Paste text (one item per line) in the input field
- Click Remove duplicates
- Duplicate lines removed. Choose keep first or last occurrence
When to use
Email/URL list deduplication, log uniquification.
Examples
A\nB\nA\nC → A\nB\nC (keep first occurrence)
FAQ
How is duplicate determined?
Exact line match. Optional trim before compare.
Case sensitive?
Yes by default. Option to ignore case (normalize to lowercase).
How to remove duplicate lines?
Paste text (one item per line), click Remove duplicates. Duplicates removed automatically.
Dedupe email list?
One email per line. Paste and dedupe. Choose keep first or last occurrence.
Dedupe URL list?
One URL per line. Paste and dedupe. Extract unique URLs from large list.
First vs last occurrence?
Keep first = top line wins. Keep last = bottom wins. Choose by data.
Does dedupe lose data?
Only removes duplicate lines. Unique lines kept. Backup original recommended.
Dedupe log lines?
Paste log, dedupe. Same error messages etc. get consolidated.
Trim before compare?
Option to ignore leading/trailing space. " a " and "a" treated same.
Does dedupe send data?
No. All in browser. List content never sent to server.