Chmod Permissions Calculator
Calculate Linux file permissions instantly. Our free Chmod Calculator translates visual checkboxes into numeric server commands locally for absolute privacy.
What is the Chmod Calculator?
Setting incorrect file permissions on a Linux server is a massive security risk. Giving a file '777' permission means anyone on the internet can potentially execute or overwrite it. Understanding the difference between Read (4), Write (2), and Execute (1) across Owner, Group, and Public scopes can be confusing. This visual calculator simplifies the process. You check boxes for who should have what access, and it instantly calculates the exact numeric (e.g., `0644`) and symbolic (e.g., `-rw-r--r--`) chmod commands. Because security configurations are sensitive, the tool operates entirely offline.
Why Use Our Chmod Calculator?
- Prevents Security Flaws: Helps you avoid accidentally giving global write access.
- Visual Interface: Translates confusing octal numbers into plain-English permissions.
- 100% Private: Your security logic is never tracked or logged.
- Instant Command Output: Provides the exact command ready to paste into your SSH terminal.
How to Use the Chmod Calculator
Use the checkboxes to assign Read, Write, and Execute permissions to the Owner.
Repeat the process for the Group and Public users.
The tool instantly updates the 3-digit octal number (e.g., 755).
Copy the generated `chmod` command.
Frequently Asked Questions
777 gives every single user on the system the ability to overwrite, delete, and execute the file. It is a critical security vulnerability.
No, the calculator logic is written in local JavaScript.
Standard web files should usually be set to 644 (Owner can read/write, everyone else can only read).
All file processing is performed locally in your web browser. We do not upload, store, or view your data.