Does this change files on my machine?

No. It only calculates values in your browser.

They map to owner, group, and others — each digit encodes rwx in octal.

chmod Calculator

Runs in browser

Calculate Unix chmod permissions and convert octal to symbolic notation.

Toggle read, write, and execute for owner, group, and others. See octal (e.g. 755), symbolic notation (rwxr-xr-x), and a ready-to-run chmod command with presets.

Octal (e.g. 755)

Octal: 755

Symbolic: rwxr-xr-x

Command: chmod 755 filename

🔒 Runs in your browser · No uploads · Your data never leaves your device

How to use

Set bits
Tick r, w, x for owner, group, and others — octal and symbolic strings update live.
Type octal
Enter three digits (0–7 each) to sync the checkboxes, or use a preset pill.
Copy command
Copy chmod 755 filename and replace filename with your path.

Common use cases

Setting correct web server file permissions — Calculate the right chmod value for web content directories (755) and files (644) before deploying to a Linux server.
Verifying private key permissions — Check that SSH private keys and secrets files use 600 (owner read/write only) for security compliance.

Examples

Web root
Typical static site permissions.
Input
```
755
```
Output
```
rwxr-xr-x
```

Frequently asked questions

Does this change files on my machine?: No. It only calculates values in your browser.
Why three digits?: They map to owner, group, and others — each digit encodes rwx in octal.

Key concepts

Octal notation: A 3-digit number representing Unix file permissions — each digit encodes read (4), write (2), and execute (1) for owner, group, and others respectively.
Symbolic notation: A human-readable permission string like rwxr-xr-x showing r=read, w=write, x=execute for each of the three permission groups.

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