How to Convert chmod Permission Modes
File Permissions
When to Convert Permission Modes
Translate between octal notation like 755 and symbolic notation like rwxr-xr-x when reading deployment docs, Dockerfiles, or ls -l output. Helpful during onboarding and when debugging permission errors on shared servers.
How Octal Maps to rwx
Each digit is the sum of read (4), write (2), and execute (1) for owner, group, and others. For example, 7 means rwx, 5 means r-x, and 4 means r--. A leading zero (0644) is common in documentation but does not change the triplet values.
Developer Tips
- Verify converted values on your system before running
chmod - Directories often need execute for owner to allow traversal
- This tool is for debugging — not a substitute for your platform security policy
Frequently asked questions
Does this change files on my machine?
No. Conversion runs in your browser and only displays octal and symbolic equivalents.
What is the difference between 755 and 0755?
For typical file modes the three permission triplets are the same. Some tools show a leading zero for four-digit notation.