Runs in your browser · Last updated 7 September 2026
Free Chmod Calculator — Unix Permissions
Free chmod calculator. Octal ↔ rwx, setuid / setgid / sticky, chmod 755 and 644. Browser tool — nothing is uploaded.
owner: read, write, execute; group: read, execute; other: read, execute. Symbolic uses s/S and t/T for setuid / setgid / sticky.
Octal
755
Symbolic
rwxr-xr-x
chmod command
chmod 755 file
How to use this tool
- Type an octal like 755 or 4755, or tick read/write/execute.
- Optionally set setuid, setgid, or sticky.
- Copy the chmod command.
Worked example
755 → rwxr-xr-x. 644 → rw-r--r--. 4755 → rwsr-xr-x. Tick the boxes and the octal updates. This is Unix file mode math, not an ACL editor.
Frequently asked questions
- What is chmod 755?
- rwxr-xr-x — owner read/write/execute, group and other read/execute. Common for directories and scripts.
- What is chmod 644?
- rw-r--r-- — owner read/write, everyone else read. Common for ordinary files.
- What does 4755 mean?
- Setuid + 755. Symbolic rwsr-xr-x. The extra leading digit is setuid (4), setgid (2), sticky (1).
- s vs S, t vs T?
- Lowercase means the execute bit is also on. Uppercase means the special bit is on without execute.
- Uploaded?
- No.