Complete guide to using chmod Calculator — a free online tool by akousa.net.
Get started in seconds — no signup required
The chmod (change mode) command in Unix/Linux sets file and directory permissions. Permissions are expressed in octal notation (e.g., 755) or symbolic notation (e.g., rwxr-xr-x). Each digit in the octal format represents permissions for the owner, group, and others, where read=4, write=2, and execute=1. This calculator converts between all formats instantly.
Opens instantly with no app install.
Use reduced samples and avoid secrets when working with sensitive data.
Download your results in multiple formats
Fully responsive design works on any device
Toggle the read, write, and execute checkboxes for owner, group, and others to build your permission set. The octal value, symbolic notation, and chmod command update in real time. You can also type an octal value (e.g., 644) to set the checkboxes automatically. Copy the result in any format with one click.
chmod Calculator is a free tool for fast everyday work with no signup required for basic use. It helps you get instant results, review them, and move on without installing a separate app.
Developers, designers, students, and everyday users rely on this tool for quick, accurate results. It's especially popular among people who need a reliable utility without installing software or signing up for an account.
Looking at alternatives to chmod Calculator? Here's how we compare to similar tools available online.
| Feature | akousa.net | Other tools |
|---|---|---|
| Price | Free forever | Often paid or freemium |
| Privacy | Privacy-conscious workflow | Varies by provider |
| Signup | Not required | Account often required |
| Ads & tracking | None | Ads and trackers common |
| Usage limits | Unlimited | Daily or file-size limits |
Add chmod Calculator to your own website with a single line of code — free, no signup required.
Get embed codechmod Calculator is also available as a developer API for use in your own apps and workflows.
View API docsAnalyze email headers to trace delivery path, check SPF/DKIM/DMARC authentication, and diagnose deliverability issues
Analyze and compare compression ratios of text data.
Minify JavaScript code by removing whitespace, comments, and shortening variable names.
Test regular expressions with real-time matching.
Akousa