Text & Content
Processed locallyAdd Line Numbers
Add Line Numbers is a browser utility designed to prefix every line of text or code with sequential numbers. No signup required.
Tool options · presets, sharing & more
Presets & sharing: options only, never files, text or passwords. Undo/redo: editable form values, not file selection or generated results.
How to Use Add Line Numbers
Open the Add Line Numbers tool interface above.
Provide your input data, settings, or file.
Review the instant preview and calculation results.
Copy your output or download the resulting file directly to your device.
What This Tool Does
Add Line Numbers helps with prefix every line of text or code with sequential numbers. See the processing notice below for privacy and connection requirements.
Common Use Cases
This tool processes files and input in this browser tab. Its processing code does not upload them to a server. Loading this page and fetching uncached app files uses an internet connection. Optional usage analytics requires your consent and excludes input, filenames, passwords and generated content. Form undo history and result transfers stay in session memory. Explicitly saved presets contain approved settings only.
Offline use is not verified for this tool. Keep an internet connection available to load its page, code and any additional dependencies.
Frequently Asked Questions
Is Add Line Numbers free to use?
Yes, Add Line Numbers is free with no account or subscription. Practical input and browser limits are described on the tool page.
Does this tool work offline?
Offline use is not verified for this tool. Keep an internet connection available to load its page, code and any additional dependencies.
Is my data stored or tracked?
Inputs and generated outputs stay in the browser session. Optional usage analytics requires consent and excludes their contents; explicitly saved settings contain approved options only.