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Free online chmod calculator with visual checkbox grid for Unix file permissions. Calculate read, write, and execute permission modes easily.
| Read (r) | Write (w) | Execute (x) | Octal | |
|---|---|---|---|---|
| Owner | 7 | |||
| Group | 0 | |||
| Others | 0 |
Bit values: Read = 4, Write = 2, Execute = 1. Sum per group gives the octal digit. All three groups combined give the chmod value.
Calculates Unix file permission modes with a visual checkbox grid. Toggle Read, Write, and Execute permissions for Owner, Group, and Others and see the octal (e.g., 755), symbolic (e.g., rwxr-xr-x), and chmod command output update in real time. Includes common presets and one-click copy for all output formats.
Unix file permissions can be confusing — converting between octal numbers, symbolic notation, and actual permissions requires mental arithmetic that is easy to get wrong. This tool provides a visual, error-free way to configure and understand file permissions.
System administrators managing file permissions on Linux/Unix servers, developers setting up project file permissions, DevOps engineers configuring deployment scripts, and students learning about Unix security.
Toggle the checkboxes for each permission (Read/Write/Execute) for Owner, Group, and Others
Watch the octal, symbolic, and command outputs update automatically
Or type a 3-digit octal number directly into the input field and press Apply
Use the preset buttons for common permission sets like 755 or 644
Click on any output box to copy that value to your clipboard
Owner: rwx, Group: r-x, Others: r-x -> Octal: 755 -> Symbolic: rwxr-xr-xOwner: rw-, Group: r--, Others: r-- -> Octal: 644 -> Symbolic: rw-r--r--ideal for scripts and directories.
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