Line Numbering Tool: Add or Remove Numbers
Add line numbers to text or code — with custom start number, separator, and zero-padding options.
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Line Numbering Tool: Add or Remove Numbers Line numbering prepends sequential numbers to text for reference in code reviews, requirements documents, logs, and procedures. Configure the start number, separator, and zero-padding options. Strip numbers with regex. Use the command-line command or Python's enumerate for programmatic numbering needs. --- When You Need Line Numbers? Line numbers serve two distinct purposes: reference and structure. The POSIX command is the Unix standard for line numbering, documented in IEEE Std 1003.1. The GNU coreutils manual covers advanced options. Reference use cases: Share a code snippet in a document and reference specific lines in comments (). Number steps in a procedure so reviewers can point to exact items. Add sequence numbers to a log extract before…
Frequently Asked Questions
How do I add line numbers to text?
Paste your text into the Number Lines tool and click Add Numbers. Each line gets a sequential number prepended, starting from 1 by default. You can change the start number, separator, and padding.
How do I add line numbers with a custom separator?
Set the Separator field to your preferred string — for example '. ' for '1. item', ': ' for '1: item', or ' ' for a tab-separated number. The separator is inserted between the number and the line content.
How do I number lines starting from 0?
Set the Start Number to 0. The first line will be numbered 0, the second 1, and so on. This is useful for zero-indexed data structures or programming examples.
How do I add zero-padded line numbers?
Enable the Zero-pad option. Numbers are padded with leading zeros to match the width of the largest line number. For 100 lines, numbers appear as 001, 002, ..., 099, 100.
How do I remove line numbers from text?
Use the Strip Line Numbers tool, or use the Remove Numbers mode in the Number Lines tool. It strips any leading numeric pattern followed by a separator from each line.
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