Chmod / Unix Permissions Calculator
Calculate Unix file permissions with interactive rwx checkboxes, octal notation (755, 644), and chmod commands
This free online chmod / unix permissions calculator runs in your browser and is part of our Developer Tools collection.
Chmod / Unix Permissions Calculator
Interactive Linux & Unix file permissions calculator. Convert between visual checkboxes, octal notation (755, 644), and symbolic string (-rwxr-xr-x).
Command: chmod 755 filename
Permissions Matrix
| Role | Read (4) | Write (2) | Execute (1) | Octal Value |
|---|---|---|---|---|
| Owner / User (u) | 7 | |||
| Group (g) | 5 | |||
| Public / Others (o) | 5 |
Special Permission Flags:
How Linux File Permissions Work
- Read (r = 4): Allows reading file contents or listing directory files.
- Write (w = 2): Allows modifying file contents or adding/deleting directory files.
- Execute (x = 1): Allows executing files as programs or entering directories (cd).
- Permissions sum up:
4 + 2 + 1 = 7(Full),4 + 2 = 6(Read+Write),4 + 1 = 5(Read+Execute).
More Developer Tools
Explore related tools in the same category to solve adjacent tasks faster.