It adds a sequential number to the beginning of each line in your text.
Yes — set any starting number, and line numbering begins from that value instead of defaulting to 1.
You can choose from separators like "1. ", "1) ", "1 - ", "1: ", or a plain space between the number and the line text.
Zero-padding adds leading zeros so all numbers have the same width, such as 01, 02, ... 10, based on the total number of lines.
Yes — there's no practical limit on the number of lines; even documents with thousands of lines are numbered instantly.