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Free Online Chmod Calculator

Calculate Unix file permissions in octal (755, 644, 777) and symbolic notation (-rwxr-xr-x) with instant bidirectional synchronization and terminal command generators.

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Permission Matrix

Role Read (4) Write (2) Execute (1)
Owner (User)
Group
Others (Public)
Human-Readable Explanation
Owner: Read, Write, Execute
Group: Read, Execute
Others: Read, Execute

Terminal Command Snippets

Standard File/Directory Command:
chmod 755 filename.txt
Symbolic Relative Command:
chmod u=rwx,g=rx,o=rx filename.txt
Recursive Directory Command:
chmod -R 755 /path/to/dir

Frequently Asked Questions

Learn more about Unix file permissions and Chmod calculations.

What is Chmod and how do Unix file permissions work?

Chmod stands for "change mode". In Unix/Linux systems, file permissions control access for Owner (User), Group, and Others (Public). Each role can have Read (4), Write (2), and Execute (1) permissions.

What are the most common Chmod permission settings?

Common settings include 755 (rwxr-xr-x) for web directories/executables, 644 (rw-r--r--) for web content files, 700 (rwx------) for private directories, and 600 (rw-------) for private SSH keys or credentials.

Are all developer tools 100% free to use?

Yes! All developer tools on AllInOneWebToolz.com are completely free with zero file limits or mandatory account registration.

Is my source code or JSON data uploaded to external servers?

No. All code formatting, minification, regex testing, and encoding occur 100% locally within your browser context. Your code never leaves your computer.

What developer utilities are supported in this suite?

We provide JSON Formatter & Validator, CSS & JS Minifier, UUID Generator, Unix Timestamp Converter, Regex Tester & Debugger, Base64 Encoder/Decoder, URL Encoder/Decoder, and Color Palette & Picker.