Does it support setuid / setgid / sticky bit?

Not as a calculation target — the tool covers the standard 9 permission bits. If you type a 4-digit value where the leading digit isn't 0 (e.g. 4755), the input field surfaces a hint that the special-bit prefix was dropped, so you don't silently get the wrong result.

Does any data leave the browser?

No. All calculations run locally in the page.

Unix Permissions Calculator

Toggle the 9 permission bits and read both numeric (755) and symbolic (rwxr-xr-x) chmod side-by-side

Owner

Group

Other

Octal

644

Symbolic

-rw-r--r--

💡 Regular file; owner can read and write

Quick guide

Use cases, answers, and nearby tools

Compact below-tool notes that help first-run users and repeated visitors move faster without changing the main interface.

Chinese search: chmod 計算機、權限計算機、檔案權限、unix 權限、八進位權限、chmod 數字計算

How to use

Run a clean first pass

Click the toggles in the matrix or type a 3-digit octal value (e.g. 755) in the reverse input.
Watch the octal number and symbolic string (e.g. -rwxr-xr-x) update instantly.
Copy the numeric or symbolic output to use directly in chmod commands or config files.

Examples

Real jobs this page helps with

Web directory setupApply preset 755 to confirm a web directory is world-readable but only owner-writable.
Private key protectionQuickly verify that 600 means owner read/write only with no access for others.

FAQ

What people usually want to know

Does it support setuid / setgid / sticky bit?: Not as a calculation target — the tool covers the standard 9 permission bits. If you type a 4-digit value where the leading digit isn't 0 (e.g. 4755), the input field surfaces a hint that the special-bit prefix was dropped, so you don't silently get the wrong result.
Does any data leave the browser?: No. All calculations run locally in the page.

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