GUIDE · 2026-07-23
How to use the chmod Calculator
Use checkboxes or a three-digit octal value to build a Unix permission and chmod command. The result follows “Read 4 + write 2 + execute 1 = each permission group's octal digit” and is designed for situations such as confirm 755 permissions for a web directory. Inputs are handled immediately in your browser with no account required.
How it works
Most processing stays in your browser instead of sending inputs to our server. Verify important financial or contractual decisions against an authoritative source.
Useful examples
- Confirm 755 permissions for a web directory
- Build 640 permissions for a config file
- Convert rwxr-xr-x into a chmod command
Frequently asked questions
Are four-digit modes supported?
The current tool handles basic three-digit permissions without setuid, setgid or the sticky bit.
What does 755 mean?
The owner can read, write and execute; group and others can read and execute.
Does it run the command?
No. It only creates the command text and never changes a file.