chmod Calculator
Calculate Unix file permissions in symbolic and octal notation.
How it works
- 1
Paste your input
Paste the code, text, or value you want to process with chmod Calculator.
- 2
Run the conversion
Use the tool controls to generate, convert, validate, or inspect the result instantly.
- 3
Copy output
Copy the final output and use it in your app, script, or workflow.
Common use cases
Standard file
Owner: rw-, Group: r--, Other: r--
Executable
Owner: rwx, Group: r-x, Other: r-x
About This Tool
Toggle read, write, and execute permissions for owner, group, and other users. See the resulting permissions in both symbolic (rwxr-xr-x) and octal (755) notation in real time.
Includes common permission presets (644, 755, 777) and bidirectional conversion -- enter an octal number to see the symbolic equivalent or toggle checkboxes to see the octal result.
More examples
Examples
Standard file
Input
Owner: rw-, Group: r--, Other: r--
Output
644 (rw-r--r--)
Executable
Input
Owner: rwx, Group: r-x, Other: r-x
Output
755 (rwxr-xr-x)
Frequently Asked Questions
- What does chmod 755 mean?
- 755 means owner has read+write+execute (7), group has read+execute (5), and others have read+execute (5). It is the standard permission for executable files and directories.
- What is the difference between symbolic and octal?
- Symbolic notation uses letters (rwx), while octal uses numbers (0-7). Each digit represents 3 permission bits: read (4) + write (2) + execute (1).
- What permissions should I use for web files?
- Common web permissions: 644 for files (owner read/write, others read-only) and 755 for directories and scripts (owner full, others read/execute).
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