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Calculate Unix File Permissions

Convert between octal and symbolic Unix permissions

Toggle checkboxes or type an octal/symbolic value. Both sides stay in sync.

Read (r)Write (w)Execute (x)
Owner (u)
Group (g)
Other (o)

About This Tool

Chmod Calculator converts Unix file permission modes between octal (e.g. 644) and symbolic form (e.g. rw-r--r--). You can also tick read/write/execute for owner, group, and others. Everything is processed locally in your browser.

How to Use

  1. Tick the permission checkboxes
  2. Or type an octal value such as 755
  3. Or type a symbolic string like rwxr-xr-x
  4. Copy the result you need
  5. Clear to reset

Common Use Cases

  • Prepare chmod commands
  • Explain 644 vs 755
  • Audit shared hosting perms
  • Teach Unix basics
  • Double-check deploy scripts

FAQ

Q1: What does 755 mean?

Owner can read/write/execute; group and others can read/execute.

Q2: Is special bits (setuid) supported?

This tool focuses on the common 3-digit rwx triad. A leading digit may be typed but only the last three digits drive the UI.

Q3: Are values uploaded?

No. Calculations are processed locally in your browser.

Q4: Can I type symbolic first?

Yes. Enter nine characters like rw-r--r-- and the octal updates.

Q5: Does this change files on my server?

No. It only calculates permission strings.

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