Remove Duplicate Lines
Remove duplicate lines from text while keeping the first occurrence and preserving the original order. Useful for deduplicating lists and logs. Runs locally in your browser.
Input
Output
Tip: You can verify in DevTools → Network that nothing is uploaded.
About this Remove Duplicate Lines
Remove Duplicate Lines keeps the first occurrence of each line and removes later duplicates, producing a unique set of lines while preserving the original order.
This is useful for cleaning lists, log files, hostnames, extracted values, and other line-based datasets. Exact matching is typically case-sensitive unless you add a case-insensitive option.
- Process text data quickly without external tools
- Transform content for development workflows
- Clean and format text for analysis
- Enable Auto to transform as you type
- Upload text files directly from your device
- Download the result when done
FAQ
No. Everything runs locally in your browser. Nothing you paste is sent to a server.
After the page loads once, it will typically keep working offline (unless you hard refresh with no cache).
No. Your input stays in your browser. Only optional preferences like theme or language may be stored.
Any plain text. You can paste text directly into the input box.
Lines are compared as exact strings. If a line repeats later, it is removed and only the first occurrence is kept.
Yes in the basic version. Apple and apple are treated as different lines unless you add case-insensitive matching.
No. The original order is preserved. Only repeated lines are removed.