How to Use the Online Add Line Numbers
Add line numbers to text, source code, or lists. Customize starting number, increment step, separator format (e.g. 1. or 1|), and zero padding.
Designed for writers, editors, students, and software developers, our Add Line Numbers runs 100% locally in your web browser. This means your text is never transmitted across the network, stored on databases, or analyzed by third-party tracking algorithms.
Key Features & Capabilities
- Instant Client-Side Processing: Calculations update in real-time as you type or paste without lag.
- One-Click Actions: Convenient buttons to Copy output, Clear input, Paste clipboard data, and Load Sample Text.
- Unicode & Internationalization: Robust handling of multi-byte characters, accents, diacritics, and emojis.
- 100% Free & Private: Unlimited usage with zero registration required.