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🔢 Line Number Adder

Add line numbers to text with customizable format, start, step, alignment, and empty line handling

Alignment

Empty Lines

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Free online line number adder tool that prefixes each line with a number. Supports 8 number formats (1. / 1) / [1] / (1) / 1: / 1、/ Tab / space), configurable start value (0/1/10/100), step (1/2/5/10), three alignment modes (left / right with spaces / right with zero-padding), and empty line handling (number all / skip empty). Also supports one-click line number removal. Live preview, runs entirely in the browser — no data uploaded.