chmod Calculator — octal ⇄ rwx permissions
Convert Unix file permissions between checkboxes, octal (755) and symbolic (rwxr-xr-x) — kept in sync.
🔒 Runs entirely in your browser. Your input and output are never sent to a server or stored — fully private.
| Read4 | Write2 | Execute1 | |
|---|---|---|---|
| Owner | |||
| Group | |||
| Others |
About this tool
This chmod calculator converts Unix file permissions between three views kept in sync: a grid of read/write/execute checkboxes for owner, group and others, the octal form (such as 755) and the symbolic form (such as rwxr-xr-x). Toggle any of them to get the chmod command you need instantly — handy for setting web-server, SSH key or script permissions, all in your browser.
Frequently asked questions
What does chmod 755 mean?
Each digit is the sum of read (4), write (2) and execute (1) for one class of user. So 755 gives the owner 7 (read + write + execute) and the group and others 5 (read + execute) — a common setting for directories and executable scripts.
What is the difference between 644 and 755?
644 (rw-r--r--) lets the owner read and write while everyone else can only read — typical for ordinary files such as HTML or config. 755 adds the execute bit, which programs need in order to run and directories need so they can be entered.
Is my data sent anywhere?
No. The calculator is simply arithmetic between permission notations and runs entirely in your browser, so nothing you select or type is sent to or stored on a server.