Add Line Numbers to Text - Free Line Numbering Tool

Add or remove line numbers from text instantly. Configurable start number, separator, padding with leading zeros. Skip empty lines option. Works offline.

Input Text

0 lines

Output (Numbered Lines)

0 lines

Line Numbering Options

Start Number

Separator

Options

Leading zeros

Skip empty lines

Preview Format

1. Sample line

Copied to clipboard!

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Frequently Asked Questions

Line numbering adds sequential numbers to each line of text, commonly used in code reviews, documentation, legal documents, poetry, scripts, and when referencing specific lines in discussions or citations.

Yes. Choose your start number (any positive integer), separator (period, colon, parenthesis, tab, or space), and enable leading zeros for consistent width alignment.

When enabled, empty lines are preserved but not numbered. Line numbers only increment for non-empty lines. When disabled, every line gets a sequential number including blanks.

Yes. The 'Remove Line Numbers' button automatically detects and strips common line number patterns (numbers followed by periods, colons, parentheses, tabs, or spaces) from the beginning of each line.

Choose from period (1.), colon (1:), parenthesis (1)), tab (1→text), or space (1 text). Each separator affects formatting for different use cases like code, lists, or documentation.

Absolutely. All processing happens locally in your browser. No text is uploaded to servers. Perfect for numbering confidential documents, code, or sensitive information.

Leading zeros pad line numbers to the same width (001, 002, 010, 100) so numbers align vertically in monospace fonts. Useful for code editors and formatted documents.

You can set any starting number. For example, start at 100 to continue numbering from a previous section, or start at 0 for zero-indexed programming contexts.

Yes, but extremely large files (over 1MB or 50,000+ lines) may experience slower processing depending on browser performance. Most typical documents process instantly.

Yes. The 'Copy to Clipboard' button copies all numbered lines instantly. The output textarea is also selectable for manual copying or further editing.

Line Numbering Options

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