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Chmod Calculator

Developer Utilities

Convert read, write and execute permissions into chmod octal and symbolic notation for owner, group and others.

How to use

Reading permission bits

Read is 4, write is 2 and execute is 1. The three digits stand for owner, group and others, so 755 gives the owner full access and read plus execute for everyone else.

  1. Tick the permissions for each group.
  2. Read the octal and symbolic result.
  3. Copy the chmod command into your terminal.

Frequently asked questions

What is 777?

Read, write and execute for everyone. It is usually a security risk on a web server.

What does a leading fourth digit mean?

The optional fourth digit sets setuid, setgid and sticky bits. This calculator covers the three permission digits.

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