How do I add line numbers to text online? +
Paste your text into the input box, configure the numbering options such as start number, step, separator, and prefix, then click Add Line Numbers. Each line gets a number prepended and the result appears on the right ready to copy or download as a TXT file.
Can I customize the format of line numbers? +
Yes. You can set a custom start number, step increment, prefix text (like "Line " or "#"), suffix text appended after each line, and a separator between the number and the content. You can also enable zero-padding so numbers align vertically — for example 001, 002, 010 instead of 1, 2, 10. Use Quick Presets for instant common formats.
Can I skip numbering empty lines? +
Yes. Enable Skip empty lines to leave blank lines without a line number while still preserving them in the output. Enable Remove empty lines to delete them entirely. This is useful when your text has paragraph breaks that you want to preserve visually without numbering them.
Can I remove line numbers from already-numbered text? +
Yes. Paste your already-numbered text into the input box and click Remove Numbers. The tool will strip common line number patterns like "1.", "1)", "[1]", "Line 1:" and similar formats, returning the clean original text. This works for most standard numbering formats.