About this tool
Add Line Prefix is part of our Text Tools collection. It is designed for a clear, fast workflow with practical options, useful output, and privacy-aware processing.
Add Line Prefix
Add Line Prefix runs entirely in your browser. Files are never uploaded to our server.
✓Your files are processed in your browser — nothing is uploaded to our servers.
Privacy-first processing
Your files are processed in your browser — nothing is uploaded to our servers.
Frequently asked questions
Can I use Add Line Prefix for free?
Yes. You can use the core Add Line Prefix workflow for free.
How are my files handled?
Your files are processed entirely in your browser. File contents are never uploaded to our server.