Add Line Numbers is a free, browser-based text processing tool. Number every line in a text file or code block. Set starting number and separator style.
Writers, bloggers, content creators, editors, and SEO professionals use Add Line Numbers every day to save time and skip the overhead of desktop software or paid services. No installation, no account, and no technical knowledge required — just paste your content into Add Line Numbers and get results in seconds. Your files never leave your browser — full privacy by design.
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How to use Add Line Numbers
1
Paste text
Enter your text.
2
Configure
Set start number and separator.
3
Copy result
Copy numbered text.
Use Cases
- Checking word and character counts before submitting essays or social posts
- Cleaning and normalising text exported from databases or other tools
- Reformatting content for specific platforms with different requirements
- Preparing text for analysis, translation, or further processing
Key Benefits
- 100% free with no usage limits, watermarks, or hidden fees
- No account or sign-up required — use it instantly
- Works in all modern browsers on desktop, tablet, and mobile
- Privacy-first: all processing runs locally, files never leave your device