Free Chmod Calculator
Set file permissions in Linux without memorizing octal codes. Click checkboxes for Read, Write, and Execute to generate the correct command.
Work Steps
How It Works
Frequently Asked Questions
What is Chmod Calculator and what is it used for?
Chmod permissions control read, write, and execute access for the owner, group, and others on Unix-like systems.
How do I use a Chmod Calculator correctly?
Numeric chmod uses three octal digits. Each digit represents read=4, write=2, and execute=1 for owner, group, or others.
How accurate is a Chmod Calculator, and what can affect the result?
For example, 755 means owner 7 (read/write/execute), group 5 (read/execute), and others 5 (read/execute).
What formula or method does a Chmod Calculator use?
Use a chmod calculator when translating between symbolic permissions such as rwxr-xr-x and numeric notation.
When should I use a Chmod Calculator instead of calculating it manually?
Permissions should follow the least-privilege principle. Avoid making sensitive files world-writable or executable without a clear reason.
What are the most common mistakes or edge cases when using a Chmod Calculator?
If permissions behave unexpectedly, check the file’s owner/group, parent-directory permissions, ACLs, and whether the filesystem supports the requested mode.