chmod calculator — octal and symbolic permissions
Convert Unix file permissions between octal (755) and symbolic (rwxr-xr-x), with a plain explanation of who can do what. It runs in your browser (0 uploads, works offline).
How to use it
- Enter your input above.
- The result appears instantly on your device.
- Copy or Download it.
FAQ
How do I calculate chmod permissions for free?
Enter permissions as 755 or as rwxr-xr-x and the other notation appears instantly in your browser, with no upload, along with a per-group explanation of read, write and execute access and the exact chmod command to use.
What does 755 mean?
Owner has read, write and execute (7); group and others have read and execute (5). Each digit is the sum of read (4), write (2) and execute (1) for that group — owner, group, others.
Is anything uploaded?
No. The conversion is local and nothing is stored; it works offline.
How do I convert symbolic to octal?
Paste the nine-character symbolic form (like rw-r--r--) and it returns the octal (644).
Limits
Standard Unix permission bits. Special bits (setuid, setgid, sticky) beyond the three groups are not covered.
Related
The URL parser and unicode inspector are other developer inspection tools.
Bookmark this page (Ctrl+D, or ⌘D on Mac) or install the app — it works offline the next time you need it.