Chmod Calculator
Toggle Unix permissions — get octal, symbolic, and a copy-ready chmod command. Nothing uploaded.
Toggle bits or type octal — symbolic + chmod command update live
| Who | Read (r) | Write (w) | Execute (x) |
|---|---|---|---|
| Owner (u) | |||
| Group (g) | |||
| Other (o) |
Owner: read, write, execute · Group: read, execute · Other: read, execute
Type 3 or 4 digits (e.g. 644, 0755, 4755)
ls style
Symbolic
chmod 755 pathClassic Unix modes only (not ACLs). Runs in your browser — nothing uploaded.
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How to use this chmod calculator
- Pick a preset (644, 755, …) or toggle Read / Write / Execute per who.
- Optionally enable setuid, setgid, or sticky for a 4-digit mode.
- Copy octal, ls-style bits, symbolic mode, or the full chmod command.
- Or type an octal value directly — the grid updates to match.
Why chmod still matters in 2026–2028
Containers, VPS boxes, CI runners, and shared hosts still speak classic Unix modes. permission denied is usually a wrong 755 / 644 / 600. This page keeps the job tight: a linked rwx grid, octal you can type, symbolic + chmod ready to paste — no ACL lab, no Windows permissions bolted on.
Converting bases (including octal) for other values? Try the Number Base Converter. Need a throwaway secret for a shared host? Use the Password Generator.
FAQ
What does chmod 755 mean?
Owner can read, write, and execute; group and others can read and execute (rwxr-xr-x). Common for directories and executable scripts.
What about 644?
Owner read/write; group and others read only (rw-r--r--). The usual mode for normal files that are not private.
What are setuid, setgid, and sticky?
They are the leading octal digit: setuid (4xxx), setgid (2xxx), sticky (1xxx). Sticky is common on shared directories like /tmp (e.g. 1777).
Is this the same as Windows permissions?
No. This tool covers classic Unix mode bits only — not NTFS ACLs or Windows rights.
Does recursive (-R) change files on my machine?
No. The checkbox only adds -R to the copied command string. Nothing runs on your system from this page.
Is anything uploaded?
No. Permission math runs entirely in your browser.
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