Chmod Calculator
Calculate Unix file permissions in numeric (octal) and symbolic notation with an interactive checkbox interface.
How to Use Chmod Calculator
The Chmod Calculator is a free online tool that helps you calculate Unix/Linux file permissions in both numeric (octal) and symbolic notation. Use the interactive checkboxes to set read, write, and execute permissions for owner, group, and others, and see the corresponding octal number (like 755), symbolic string (like rwxr-xr-x), and the full chmod command instantly. Whether you are setting up web server permissions, configuring deployment scripts, securing sensitive files, or learning Linux file permissions, this visual calculator eliminates guesswork. No need to memorize octal values — just check the boxes and copy the command.
Step-by-Step Instructions
- Check the read, write, and execute boxes for Owner
- Set permissions for Group and Others the same way
- View the octal value, symbolic notation, and chmod command
- Copy the chmod command to use in your terminal
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