Chmod Permissions Calculator
| Read (4) | Write (2) | Execute (1) | |
|---|---|---|---|
| Owner | |||
| Group | |||
| Others |
Calculate Unix file permissions by toggling read, write and execute for owner, group and others, and get both the octal number and the symbolic notation. Remembering that 755 means rwxr-xr-x, or working out which checkboxes map to 644, is exactly the kind of thing this tool removes from your day. Tick the permissions you want and it instantly shows the three-digit octal value you pass to chmod, along with the ls-style symbolic string so you can sanity check against a directory listing. You can also type an octal value and watch the checkboxes update. Set the permissions you need and copy the number. Everything is computed in your browser with no network calls at all.
How to use Chmod Calculator
- Toggle read, write and execute for owner.
- Set the same for group and others.
- Read the octal number and symbolic notation.
- Copy the chmod value.
Frequently asked questions
What do the octal chmod digits mean?
Each digit is the sum of read (4), write (2) and execute (1) for owner, group and others in turn, so 755 means rwx for owner and r-x for group and others.
Does it show symbolic notation too?
Yes. Alongside the octal number it shows the rwx style symbolic string that matches your selected permissions.
How do I get a value like 644?
Toggle read and write for the owner and read only for group and others, and the tool computes 644 for you.
What is Chmod Calculator?
Calculate Unix file permissions by toggling read, write and execute for owner, group and others, and get both the octal number and the symbolic notation. Remembering that 755 means rwxr-xr-x, or working out which checkboxes map to 644, is exactly the kind of thing this tool removes from your day.
Is Chmod Calculator free to use?
Yes. Chmod Calculator is completely free, with no sign-up and no usage limits.
Does Chmod Calculator work in a web browser?
Yes. Chmod Calculator runs in any modern web browser. There is nothing to download or install.
Is my data private with Chmod Calculator?
Yes. Chmod Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
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Link this tool from a README, doc or site. The badge links back to this page.
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