Chmod Calculator - Unix Permissions
Visual interface to set Unix/Linux file permissions. Generate octal (755) or symbolic (rwxr-xr-x) notation.
chmod 644 myfile.txt- Owner: read, write
- Group: read
- Others: read
How to Use Chmod Calculator - Unix Permissions
Click checkboxes for each permission (Read/Write/Execute) for Owner, Group, and Others. The tool instantly shows octal notation, symbolic notation, and the chmod command.
🔒 Privacy First: This tool runs entirely in your browser. Your data never leaves your computer.
Common Use Cases
- Set correct permissions for web server files
- Make scripts executable with proper security
- Troubleshoot permission denied errors
- Learn Unix file permission system
Chmod Calculator - Unix Permissions FAQ
chmod (change mode) is a Unix command that sets file/directory permissions. It controls who can read, write, or execute files.
Each digit represents permissions for owner, group, and others. 4=read, 2=write, 1=execute. Add them: 7=rwx, 5=r-x, 4=r--, etc.
755 (rwxr-xr-x) is for executables/directories - owner has full access, others can read/execute. 644 (rw-r--r--) is for files - owner reads/writes, others read only.
Run "chmod 755 filename" or "chmod +x filename" in terminal. The tool generates the command for you.