Quick start
-
Toggle bits
Set owner, group, and other permission triplets.
-
Enter octal or symbolic
Blur to sync from values like 755 or -rwxr-xr-x.
Chmod Calculator
Toggle read/write/execute bits and see octal modes like 755, 644 plus symbolic -rwxr-xr-x. Essential for deploy scripts, Dockerfiles, and server debugging.
Privacy: processed locally, never uploaded.
↓ Paste in the input area below to see results instantly
Toggle permission bits, or sync from octal / symbolic input below.
| Who | Read (r) | Write (w) | Execute (x) |
|---|---|---|---|
| Owner (u) | |||
| Group (g) | |||
| Other (o) |
Octal
755
Symbolic
-rwxr-xr-x
Binary
111 101 101
Notes
Common modes
755 = rwxr-xr-x (scripts/executables); 644 = rw-r--r-- (regular files); 600 = rw------- (private configs).
Toggle read/write/execute bits and see octal modes like 755, 644 plus symbolic -rwxr-xr-x. Essential for deploy scripts, Dockerfiles, and server debugging.
Features and use cases
Convert numeric chmod (755) ↔ rwx notation by toggling read/write/execute bits.
Use in deploy scripts, Dockerfile permissions, host troubleshooting, and learning Unix modes.
Common modes
755: executables/dirs; 644: regular files; 600: owner-only read/write.
Typical Workflow
When configuring file permissions for servers, first determine the access requirements. For example, website executable scripts typically need 755 permissions (full owner access, read/execute for others), while config files suit 644 (owner write-only). This tool shows real-time conversion between permission bits and symbolic notation.
In practice, check the permission boxes to auto-generate octal codes. Copy these codes to terminal commands like `chmod 755 script.sh`. For Docker deployments, use the generated numbers in Dockerfile to set initial permissions for COPY operations.
Examples
Script
Input
rwxr-xr-x
Output
755
FAQ
setuid/setgid/sticky?
Standard 9 rwx bits only; no setuid/setgid/sticky.
Why do directories usually need execute(x) permission?
The execute permission for directories means 'access' permission. Without x, users can't list files even with read(r) permission. This security feature makes 755 (not 750) common for directories, ensuring proper content access.