Add Line Numbers
Prefix every line with a consistently aligned line number for review, notes and code snippets.
About Add Line Numbers
Add Line Numbers prefixes every line with a right-aligned sequential number. The number width automatically grows with the line count so longer documents remain visually aligned.
How to use Add Line Numbers
Paste multiline text and run the tool. ToolFlow counts the lines, calculates the required number width and prefixes each line from 1 through the final line.
When Add Line Numbers is useful
- Reference specific lines during review or support conversations.
- Number plain-text instructions or checklists.
- Prepare snippets where line references are useful but the source has no editor gutter.
Practical tips
- Blank lines are numbered too, because they are part of the submitted text.
- Line numbers become part of the returned text.
- Use the browser copy function carefully when the destination already adds its own line numbers.
Add Line Numbers FAQ
Are blank lines numbered?
Yes. Every submitted line receives a number.
Do numbers start at zero?
No. Numbering starts at 1.
Privacy and file handling
Submitted values are processed to produce the requested result. This tool does not require an external content-generation provider. Avoid submitting confidential information unless you are comfortable with the site's server and hosting retention policies. See the Persónuvernd for details.