Best for
- System administrators, backend developers, and anyone managing Linux/Unix file systems.
Privacy
All calculations run locally in your browser.
Quick tips
- 777 grants full access to everyone and is generally unsafe.
- 644 is standard for web files, 755 for directories.
How to use this tool
- Select the Read, Write, and Execute checkboxes for Owner, Group, and Public.
- Watch the octal (e.g., 755) and symbolic (e.g., rwxr-xr-x) values update instantly.
- Alternatively, type an octal value to update the checkboxes.
Common questions
What does 755 mean?
755 means the Owner can read, write, and execute. Group and Public can only read and execute.