How do I start line numbering from a specific number?

Set the starting number in the configuration options. This is useful when you are numbering a continuation of a previous document or want to match existing line numbers. For example, if your previous section ended at line 50, set the starting number to 51 for seamless continuation.

What number format should I use for my document?

Use standard format (1, 2, 3) for most documents and code. Use zero-padded format (01, 02, 03) when you need consistent alignment, especially for documents with 100+ lines where '1' and '100' would misalign. Zero-padded format ensures all numbers have the same width for neat columns.

Should I number blank lines or skip them?

It depends on your context. Legal documents typically number every line including blanks for complete reference. Code documentation often skips blank lines for cleaner output. Academic papers usually follow their specific style guide. Our tool lets you choose based on your requirements.

Can I add line numbers to very large files?

Yes, the tool handles files of any size efficiently. Whether you have 50 lines or 50,000 lines, the numbering is applied instantly. The tool processes everything in your browser, so there is no server upload delay regardless of file size.

What separator should I use between the number and text?

A period followed by a space (1. Text) is the most common format for general documents. A colon (1: Text) is popular in technical contexts. A bracket (1) Text) is common in code editors. Choose the format that matches your style guide or the convention used in your field.

Can I remove line numbers that were previously added?

While this tool is designed for adding line numbers, you can use our find and replace tool to remove them. Search for the number pattern at the beginning of each line (using regex mode like '^\d+[.:]\s*') and replace with nothing to strip the line numbers from your text.

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Add Line Numbers

Referencing specific lines is much easier when you add line numbers online free with our tool. Whether you're preparing code reviews, legal documents, or academic papers, this tool numbers every line with customizable formatting options. Just paste your text and get numbered output instantly.

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What is Add Line Numbers?

An add line numbers tool is a text utility that prefixes each line of text with a sequential number, providing precise line references for code reviews, legal documents, and academic papers.

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Professional documents need professional line numbers. Our free add line numbers tool gives you full control over formatting — from starting number and zero-padding to separators and alignment — so your code, legal documents, and transcripts are always perfectly organized and easy to reference.

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