Add Line Numbers
Prefix text lines with line numbers. Free, private, and local-first.
Use Add Line Numbers
Prefix each line with configurable line numbers.
1. Install dependencies 2. Run tests 3. Deploy site
Quick answer
Add Line Numbers is a free online tool that helps you prefix text lines with line numbers. It runs in your browser, so you can work with development data, text, files, or generated output without creating an account.
About Add Line Numbers
Add Line Numbers helps you prefix text lines with line numbers. It is designed for focused local-first workflows where you need a quick result without creating an account or sending your input to a server.
Common uses include numbering instructions or checklists, preparing code snippets for documentation, adding references to review notes.
Use the examples, usage notes, FAQ, and related tools below when you need to compare formats, build sample data, validate inputs, or move into the next step of the same workflow.
What this tool does
How to use Add Line Numbers
- 1
Paste lines into the input area.
- 2
Set the starting number and separator.
- 3
Enable padding when needed.
- 4
Copy the numbered text.
Examples
Input
Install Test Deploy
Output
1. Install 2. Test 3. Deploy
Use cases
- Numbering instructions or checklists
- Preparing code snippets for documentation
- Adding references to review notes
- Formatting ordered lists from plain text
Related workflow
After using Add Line Numbers, many workflows continue with related tools for validation, conversion, cleanup, mock data, or final export.
Privacy and usage notes
CodeVella tools are designed to run locally in your browser. Your input is not uploaded to a server, and no account is required.
Generated test data is intended for development, QA, demos, and safe internal workflows.
Frequently asked questions
Is my data uploaded?+
No. This tool is designed to run locally in your browser.
Do I need an account?+
No signup is required for CodeVella tools.
Can I start numbering from a custom number?+
Yes. Set the start number, choose the separator, and optionally pad numbers with leading zeros.