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Chmod Calculator

Interactive Unix permission calculator with octal and symbolic outputs, quick presets, direct octal input, and copy-ready chmod commands.

Browser-BasedResponsive UI Privacy-First
Presets

Calculator

Permissions builder

Client-side chmod studio

Select permissions, use a preset, or type an octal value to generate both numeric and symbolic chmod commands instantly.

Scope
Read (4)
Write (2)
Execute (1)
Owner
Group
Others

On smaller screens, swipe sideways if you need a little more room.

Umask calculator

See how a umask affects your permissions.

Requested:755
Umask:022
Resulting:755
Umask subtracts permissions. For files, execute bits are typically removed.

Quick guidance

Use `755` for scripts or public files you want everyone to read, but only the owner to edit.

Results

Generated permissions

Octal755
Symbolicrwxr-xr-x
Owner: Read, Write, and Execute (rwx)
Group: Read and Execute (r-x)
Others: Read and Execute (r-x)
Special: No special bits enabled.

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How it works

About the Chmod Calculator

The Chmod Calculator is a free interactive tool that converts Unix file permissions between octal and symbolic formats. Click the permission tiles for owner, group, and others to build your desired mode, or type an octal value directly to see the corresponding symbolic output instantly.

Use the built-in presets for common scenarios like public web files (755), private keys (600), and collaborative folders (775). Copy the ready-to-run chmod command, download a summary image, or share the tool with your team. All calculations run in your browser with zero server calls.