Line Numbers
Prefix lines with numbers.
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How to Use the Line Number Generator
Paste your text, code snippet, or list directly into the input text area.
Customize the starting index, choose your preferred separator style (periods, colons, brackets), and toggle zero-padding.
Click "Add Line Numbers" to instantly prefix each line of your document. Use the copy button to grab the results.
Features & Capabilities
100% Privacy Preserved
All string manipulations happen securely within your browser. Your sensitive lists, code, or personal data are never uploaded to remote servers.
Smart Blank Line Handling
Enable "Skip empty lines" to ensure that blank spaces in your document are ignored by the counter, perfectly numbering only the lines that contain content.
On-Demand Processing
Execute transformations manually by clicking the button. This prevents browser lagging when pasting extremely large datasets or lengthy code files.
Zero Padding
Keep your lists perfectly aligned visually. The zero-padding feature automatically calculates the total number of lines and pads single digits (e.g., 01, 02) so they align with double digits.
Frequently Asked Questions
When should I use this tool?
This tool is highly useful for adding line numbers to code snippets for documentation, creating numbered lists from raw data, or referencing specific lines in lengthy text files.
How many lines can I process at once?
Because this tool runs exclusively in your local browser environment, it can easily handle tens of thousands of lines almost instantly without timing out.
Does this tool save or store my text?
No. This utility relies purely on client-side JavaScript. The text you input remains isolated in your browser tab's active memory and is permanently erased the moment you close or refresh the page.
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