Why Tools Ku
- Free, no signup
- Browser-local, not uploaded
- No install
- Desktop & mobile
Line Numbers: Add sequential numbers with width and custom separator. Text stays in your browser.
Works with regex, diff, and replace tools.
Steps
- Paste text
- Choose options
- Run
- Copy output
FAQ
- Signup required for Line Numbers?
- No. Free with no account.
- Uploaded?
- No.
- Unicode/Chinese?
- UTF-8 supported.
- Huge text?
- May slow down; split large inputs.
- Mobile browsers?
- Yes; heavy tasks better on desktop Wi-Fi.
- Copy or download?
- Yes—copy text or download files as supported.