This free online tool automatically adds sequential line numbers to each line of your text. It's perfect for code snippets, legal documents, poetry, scripts, data logs, or any text that needs clear line referencing. You can customize the starting number, step interval, number format, and more — all processed locally in your browser for complete privacy.

We support five popular formats: 1. Text (dot separator), 1) Text (parenthesis), 1 - Text (dash separator), 1: Text (colon separator), and 1 Text (plain number with space). You can also pad numbers with leading zeros (e.g., 001, 002) for better alignment in monospace fonts.

Yes! Enable the "Skip Empty" option, and blank lines will be preserved in the output but won't receive a line number. Only lines containing text will be numbered sequentially. This is especially useful when formatting poetry, song lyrics, or structured documents with intentional blank lines.

Switch to the "Remove Line Numbers" tab. Paste your numbered text, and the tool automatically strips away common line number patterns — including dotted (1.), parenthesized (1)), dashed (1 -), colon-separated (1:), and plain number prefixes. The cleaned text appears instantly in the output panel.

Absolutely safe. All text processing happens entirely in your browser using client-side JavaScript. None of your text is ever uploaded, transmitted, or stored on any server. You can use this tool offline once the page is loaded. Your privacy is 100% guaranteed.

There's no hard limit — the tool can handle texts with thousands of lines. However, performance depends on your device's capabilities. For texts exceeding ~50,000 lines, you may notice slight processing delays. For optimal performance, we recommend processing extremely large files in smaller batches.

Yes! Set any starting number (including 0 or negative numbers) and any step interval (e.g., 2 for even numbers, 5 for increments of 5). This makes the tool ideal for creating numbered lists that continue from a previous section, generating multiples, or aligning with specific numbering schemes in documents.