Line Number Adder
Add or remove line numbers from text.
How to use
Runs entirely in your browser. Live updates or click to run. No signup, no tracking, no data sent anywhere.
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Part of 71 free tools by Auburn AI. Category: Text Tools
About this tool
Line Number Adder is a straightforward text utility that prepends a sequential number to every line of your input, producing numbered output you can copy right away. It suits developers reviewing log files, writers organizing drafts, teachers preparing worksheets, and anyone who needs to reference specific lines in a document without doing it by hand.
Reach for this tool when you are sharing a code snippet for review and want colleagues to cite exact lines, when you are proofreading a long document and need position markers, or when a script or process expects pre-numbered input that your source file does not already provide.
How to use it
- Paste or type your text into the input box on the page.
- Choose a starting number if you need something other than 1.
- Select a separator style, such as a period, colon, or tab, between the number and line text.
- Click the Add Line Numbers button to process your input.
- Review the numbered output in the result area below the button.
- Click Copy to copy the numbered text to your clipboard.
Pro tips
- If you only want to number non-blank lines, remove empty lines first using a Find and Replace pass before running this tool.
- Padding numbers with leading zeros, such as 01 instead of 1, keeps columns aligned cleanly when sorting or displaying output in monospace editors.