// Text
Add Line Numbers online
Add line numbers to any block of text — customisable format
by
CHUNKY
MUNSTER
MUNSTER
Add Line Numbers prefixes every line of an input block with a sequential counter. You control the starting number, the delimiter that separates the number from the text (default '. '), and whether numbers are space-padded so the columns line up. The whole pipeline runs on every keystroke so you can preview and tweak.
Padding width is computed from the largest number that will be emitted, so a 1000-line block starting at 1 reserves four columns for the gutter and you get ' 1.', ' 2.', ..., '1000.'. With 'Skip empty lines' enabled, blank lines pass through untouched and do not consume a number — useful when numbering paragraphs of prose rather than every line of a code block.
Yes. The text is split on \n, prefixed, and re-joined with \n. Trailing newlines are preserved. Windows-style \r\n input becomes \r\n on output because the \r stays at the end of each line.
When 'Pad numbers' is on, every number is left-padded with spaces to match the width of (start + line count). So a 10-line block starting at 1 produces ' 1.', ' 2.', ..., '10.' — the columns line up regardless of digit count.
Yes — change the Start field to any non-negative integer (0, 100, 9999). The padding width is then computed from the largest number actually emitted, so columns still align.
Empty or whitespace-only lines pass through with no number prefix and don't consume a number — the next non-empty line gets the next sequential number, so the count reflects real content lines only.
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