Chmod Calculator
DevOps & NetworkConvert Unix file permissions between symbolic notation (rwxr-xr-x) and octal values (755) instantly. Toggle checkboxes for owner, group, and others visually.
| Entity | Read (r) | Write (w) | Execute (x) | Octal |
|---|---|---|---|---|
| Owner (u) | 7 | |||
| Group (g) | 5 | |||
| Others (o) | 5 |
Octal
755Symbolic
rwxr-xr-xchmod command
chmod 755 filenamels -l style
-rwxr-xr-xRelated Tools
About Chmod Calculator
The Chmod Calculator converts Unix file permissions between human-readable symbolic notation (rwxr-xr-x) and octal values (e.g. 755) in real time. Toggle read, write, and execute checkboxes for the owner, group, and others sections and watch both representations update instantly. Ideal for system administrators and developers who need to set correct file permissions without memorising octal codes.
Features
- ✓Visual checkbox grid for owner, group, and others permission fields
- ✓Bidirectional conversion between symbolic (rwxr-xr-x) and octal (755) notation
- ✓Special bits: setuid, setgid, and sticky bit support
- ✓One-click common presets (644, 755, 700, 777)
- ✓Instant human-readable permission summary
- ✓Copy octal value or symbolic string to clipboard
- ✓100% client-side — no data leaves your browser
Common Use Cases
- Setting correct file permissions for web server directories and config files
- Translating octal values in deployment scripts to symbolic notation for review
- Teaching Unix permission concepts with visual, interactive feedback
- Quickly checking what rwxr-xr-x or a numeric chmod value actually means
Frequently Asked Questions
QWhat is the difference between 755 and rwxr-xr-x?
They represent the same permissions. 755 is octal notation; rwxr-xr-x is symbolic notation. Owner has read, write, execute; group and others have read and execute only.
QDoes the calculator support setuid, setgid, and the sticky bit?
Yes. Dedicated checkboxes let you toggle each special bit, and the resulting 4-digit octal value (e.g. 4755) is shown alongside the standard 3-digit form.
QCan I type an octal value directly?
Yes. Type any valid 3- or 4-digit octal value into the input field and the checkboxes and symbolic string update automatically.