Remove Duplicate Characters
Remove duplicate characters from text while preserving the first occurrence of each character. Useful for quick cleanup and analysis.
Input
Output
Tip: You can verify in DevTools → Network that nothing is uploaded.
About this Remove Duplicate Characters
Remove Duplicate Characters keeps the first occurrence of each character and removes subsequent repeated characters that appear later in the text.
Character order is preserved based on first appearance, so the result is deterministic. This can be useful for quick normalization, filtering, or visual checks in small strings.
- 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.
Yes. Uppercase and lowercase letters are treated as different characters (A and a are not the same).
Yes. The first time a character appears is kept, and later duplicates are removed while keeping the original order.
No. It operates at character level. Use Remove Duplicate Words for word-level deduplication.