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Add Line Numbers

▸About this tool

Prepend line numbers to each line of text instantly. Customise the starting number, separator (period, colon, or tab), and optional zero-padding.

▸Privacy and details

Your files never leave your device.

Fast browser processing with no account required.

Optimized for desktop and mobile with accessible controls.

▸How to use
  1. Paste your text into the input area.
  2. Set the starting line number (default 1).
  3. Choose a separator: period and space, colon and space, or tab.
  4. Enable zero-padding to align line numbers to the same width.
  5. Copy or download the numbered output.
▸Why use this tool

Line numbers are essential when referencing specific lines in code reviews, technical documents, or log files. This tool adds them instantly without opening a code editor.