Chmod Calculator
Understand and build Linux file permissions visually. Tick read/write/execute for owner, group and others and instantly get the octal value (like 755), the symbolic notation (rwxr-xr-x) and the ready-to-run chmod command — or type an octal number and see what it grants.
Examples
755
rwxr-xr-x — owner: read/write/execute; group & others: read/execute
644
rw-r--r-- — owner: read/write; group & others: read only
How it works
A permission mode is three digits: owner, group, others. Each digit is the sum of read (4), write (2) and execute (1). Tick the boxes or type the number and the tool shows the octal value, the symbolic form and the chmod command.
| Digit | Symbolic | Access |
|---|---|---|
| 7 | rwx | Read, write and execute |
| 6 | rw- | Read and write |
| 5 | r-x | Read and execute |
| 4 | r-- | Read only |
| 0 | --- | No access |
On a directory, execute means permission to enter it and reach the files inside. The calculator covers the three standard digits only; the special fourth digit used for setuid, setgid and the sticky bit, as in 4755, is not supported.
How to use Chmod Calculator
Why use this tool
Frequently asked questions
The owner can read, write and execute (7 = 4+2+1); group and others can read and execute (5 = 4+1). It is the standard permission for directories and executable scripts.
644 has no execute bits — it is for regular files (owner read/write, everyone else read). 755 adds execute for everyone, needed for scripts and for entering directories.
It lets every user on the system modify the file. On shared hosting or servers, that is an open door for tampering — use the least permission that works instead.
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