Number Lines

Choose start, step, separator, zero-padding, and whether blank lines consume a number.

Before / afterLine endingsUTF-8 bytesRepeat safely

Lines

Start

Step

Separator

Zero-pad width

Text cleanup runs locally in your browser. These tools operate on plain text lines; structured CSV/JSON/XML and regex workflows remain in their dedicated tools.

Numbering changes every selected line

Blank-line numbering, start, step, separator and zero-padding all affect whether the result can be reversed cleanly.

Repeatable text workflow

Use output as input only when the preview is what you intended. Restore returns to the page-load sample, and the before/after audit remains local to your browser.