How to use this tool
- Paste your list, one item per line.
- Toggle case-insensitive matching if "Apple" and "apple" should count as the same line.
- Copy the deduplicated result.
Why deduplicate lines in the browser?
This tracks seen lines locally as it walks through your input — nothing you paste is sent anywhere, whether it's a mailing list or a set of URLs.
Frequently asked questions
- Which occurrence does it keep — the first or the last?
- The first occurrence of each line is kept, and later duplicates are removed, so the original order is otherwise preserved.
- Does it treat "Apple" and "apple" as duplicates?
- Only if you check "Treat different case as duplicate" — by default, case matters, so they're kept as two separate lines.
How GetByteRush compares
Most free tools for this online work the same way: you upload your file to their server, wait, then download the result — which means your file (and often your email, for a "free" account) sits on someone else's infrastructure. Here's the actual difference:
| Feature | GetByteRush | Typical online duplicate line removers |
|---|---|---|
| Data ever leaves your device | No — 100% client-side | Often yes |
| Account required | Never | Sometimes |
("Typical online tools" reflects publicly documented behavior of common free file-processing sites as of 2026 — always check a specific competitor's own privacy policy and pricing page, since these details change.)