Add Line Numbers to Text Online (Free Line Numbering Tool)
Need to add line numbers to text quickly? Use this free line numbering tool to number lines online instantly, customize separator format, and skip blank lines — no signup required.
🔒 No data is stored. Everything runs in your browser.
Line numbering is commonly used in programming, legal documents, and academic writing to reference specific sections accurately. Manual numbering is tedious and error-prone — this add line numbers online tool does it in one click:
Reference specific lines in code reviews — "fix line 47" is clearer than "fix the third paragraph"
Format scripts and structured text — numbered lines make teleprompter scripts and dialogue easier to navigate
Save time compared to manual numbering — automatically numbers hundreds of lines in milliseconds
Improve readability for editing — editors and reviewers can point to exact line numbers for precise feedback
You can also count lines first using our Line Counter before adding numbers.
How to use
How to Add Line Numbers to Text
This line numbering tool works in 4 steps:
1
Paste your text — click the input box and paste any plain text, code, or document content.
2
Set your options — choose a starting number (default 1) and a separator format (period, colon, bracket, or custom).
3
Toggle skip blank lines (optional) — blank lines will be preserved but not numbered.
4
Click Add Line Numbers — copy the result instantly.
FAQ
Frequently Asked Questions
Yes. Enable the "Skip blank lines" checkbox before clicking Add Line Numbers. Blank lines are preserved in the output but do not receive a number.
Yes. Set any starting number in the Start Number field — useful for continuing a numbered list or starting at 0 for programmers.
Any separator — period and space (1. ), colon (1:), bracket (1)), or any custom character. The separator appears between the line number and the text on each line.
Yes, completely free with no account or signup required. Everything runs in your browser — no text is sent to any server.