Add line number prefix

Client

Aligned gutter numbers for pasted lists.

About Add line number prefix

Prefix each line with 1-based line numbers. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.

How to use this page

Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.

1 | alpha\nbeta\ngamma

Nearby workflows on Toolcore

  • Add line numbers — Prefix or suffix line numbers on pasted code or logs—custom start index, browser-only. for the next text or markup step in your edit loop.
  • Remove line numbers — Strip leading line numbers like 12 | or 12:. for the next text or markup step in your edit loop.
  • Quote lines — Wrap each line in single or double quotes with basic escaping—for string lists and codegen prep. for the next text or markup step in your edit loop.
  • Word & character count — Words, characters, lines, and reading time—paste any text, all client-side. for the next text or markup step in your edit loop.

Common use cases

  • Add line number prefix for quick local checks without uploading data.
  • Copy results into tickets, docs, or classroom notes.

Common mistakes to avoid

  • Unexpected input shape

    See the intro and how-to notes for accepted formats.

FAQ

Is processing local?

Yes—this runs entirely in your browser.

Agent prefill?

Use q or qb for the main text field when supported.

More tools

Related utilities you can open in another tab—mostly client-side.