Chmod Calculator — Unix File Permissions
Calculate Unix file permissions in numeric and symbolic notation. Free, no signup, works in your browser.
| Read | Write | Execute | |
|---|---|---|---|
| Owner | |||
| Group | |||
| Others |
Numeric
Click to copy755
Symbolic
Click to copy-rwxr-xr-x
Command
Click to copychmod 755 filename
Common Presets
All calculations happen in your browser. No data is sent to any server.
About Chmod Calculator
This chmod calculator helps you build Unix file permission values by toggling read, write, and execute permissions for owner, group, and others. The tool displays the result in three formats: numeric octal (e.g., 755), symbolic notation (e.g., -rwxr-xr-x), and a ready-to-paste chmod command. Use it to figure out the right permission value for files, directories, scripts, and deployment configurations. Common presets like 755, 644, and 700 are available with one click.
Frequently Asked Questions
What does chmod 755 mean?
chmod 755 gives the owner full permissions (read, write, execute) and gives the group and others read and execute permissions. It's the most common permission for directories and executable scripts.
What is the difference between numeric and symbolic chmod notation?
Numeric notation uses three octal digits (e.g., 755), where each digit represents permissions for owner, group, and others. Symbolic notation uses letters (r, w, x) and dashes (e.g., -rwxr-xr-x). Both represent the same permissions.
When should I use chmod 644 vs 755?
Use 644 for regular files that don't need to be executed (HTML, CSS, images, config files). Use 755 for directories, scripts, and programs that need execute permission.