Chmod Calculator
Calculate Unix file permissions. Convert between octal and symbolic notation.
| Scope | Read (r) | Write (w) | Exec (x) | Octal |
|---|---|---|---|---|
| Owner | 7 | |||
| Group | 5 | |||
| Other | 5 |
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What is this tool?
chmod calculator converts between octal (777) and symbolic (rwxrwxrwx) Unix file permission formats. It shows permissions for owner, group, and others with read (4), write (2), and execute (1) values. Essential for Linux/Unix system administration, web server configuration, and file security management.
How to use
- 1
Enter permissions
Input octal code (e.g., 755) or select rwx checkboxes.
- 2
View conversion
See both octal and symbolic representations.
- 3
View results
Review the output.
Frequently Asked Questions
What does chmod 755 mean?
chmod 755 means: owner has read+write+execute (7=rwx), group has read+execute (5=r-x), others have read+execute (5=r-x). Commonly used for executable scripts and directories.
What are common chmod values?
755 for directories, 644 for files, 600 for sensitive.
What is the most secure chmod setting?
The most restrictive setting is chmod 000 (no permissions for anyone), but this makes the file unusable. For sensitive files like private keys or passwords, use chmod 600 (owner read/write only). For directories, chmod 700 (owner full access only) is most secure. The principle of least privilege applies: grant only the minimum permissions needed.