💻 chmod Calculator — Octal and Symbolic
Tick owner, group and other permissions to get the octal mode, symbolic string and a chmod command. Or decode an octal value the other way.
How it works
- Tick read, write and execute for owner, group and other, then press From checkboxes.
- Or type a three-digit octal mode and press Decode octal to fill the meaning.
- Copy the chmod command. Special bits such as setuid are not included.
Examples
- Owner read/write and everyone else read is 644, shown as rw-r--r--.
- Owner rwx and group/other r-x is 755, a common directory mode.
- Typing 600 decodes to owner read and write only.
Frequently asked questions
What do the digits mean?
Each class sums read=4, write=2 and execute=1. 7 is rwx, 6 is rw-, 5 is r-x and 4 is r--.
Does this change files on a server?
No. It only prints the command. Run chmod yourself on the machine that owns the file.
Are setuid and sticky bits included?
No. This calculator covers the standard three-digit owner, group and other mode.
Related tools
More Developer tools →UUID Generator
Generate up to 100 random UUID version 4 identifiers at once, uppercase or without hyphens. Cryptographically secure, free, no sign-up.
Cron Expression Explainer
Turn a five-field cron expression into plain language and upcoming run times.
CIDR Subnet Calculator
Find the IPv4 network, broadcast, usable hosts, and subnet mask for any CIDR prefix.
URL Inspector
Break an absolute URL into protocol, host, path, query pairs and hash.