Add Line Numbers

Prefix each line with its number. Use the Add Line Numbers below — everything runs in your browser, nothing is uploaded.

How it works

Enter your values in the Add Line Numbers above. Results update instantly and stay on your device.

Formula and source

This tool applies its standard published method. Check the linked source for the exact definition.

Tips

• Double-check units before trusting a result.
• Bookmark the page — its address never changes.

FAQ