Octal · symbolic · chmod command
Chmod Calculator
Convert Unix file permissions between octal (755), symbolic (rwxr-xr-x) and the chmod command, in both directions.
| Read | Write | Execute | Octal | |
|---|---|---|---|---|
| Owner | 7 | |||
| Group | 5 | |||
| Others | 5 |
755
rwxr-xr-x
chmod 755 fileOctal digit = read(4) + write(2) + execute(1) per Owner / Group / Others. Use chmod -R 755 dir to apply recursively.
About this tool
The chmod calculator converts Unix file permissions between numeric (octal) and symbolic notation in both directions. Toggle read, write and execute for owner, group and others and watch the octal value (for example 755) update, or type a number and see the rwx breakdown.
It is handy when you are writing a deployment script, hardening a web root, or just trying to remember whether 644 or 640 is the safer default for a config file. Nothing leaves your browser.
Frequently asked questions
What does chmod 755 mean?+
755 means the owner can read, write and execute, while group and others can read and execute but not write. It is a typical setting for directories and executable scripts.
When should I use 644?+
644 gives the owner read/write and everyone else read-only. It is the standard permission for regular files such as HTML, config and documents that should not be world-writable.
What is the difference between 777 and 755?+
777 grants write access to everyone, which is almost always a security risk. 755 keeps write access limited to the owner. Avoid 777 on anything exposed to a network.