Calculate Unix file permissions. A handy utility tool for everyday development tasks.
755rwxr-xr-xchmod 755 filenameSet your desired options or enter data.
Results are generated instantly.
Copy the result or download.
Use the Chmod Calculator when setting file permissions on Unix/Linux systems, configuring web server file access, or troubleshooting permission-denied errors. It is essential for system administrators and developers deploying applications to Linux servers. Use it to understand and verify permission values before running chmod commands in production environments.
Yes, the Chmod Calculator is completely free with no limitations. Calculate Unix file permissions using numeric (octal) or symbolic notation as many times as you need. No signup, no ads, and no premium features — everything is fully accessible to all users.
Yes, the Chmod Calculator works completely offline after the initial page load. Permission calculations are performed using simple JavaScript math operations with no server communication required. It is perfect for use in environments with restricted internet access.
All permission calculations happen locally in your browser. No file paths, permission values, or system information is ever transmitted to any external server. The calculator is a purely mathematical tool that requires no external data, ensuring complete privacy.
Read our complete guide on how to use Chmod Calculator effectively.