Application & Code Security100% In-BrowserChmod 755/644
File Permission (Chmod) Calculator & Checker
Calculate and audit Unix/Linux file permissions (755, 644, 400, 777) and identify dangerous write privileges.
Real-time processing·No server uploads·Zero telemetry
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How to Use File Permission (Chmod) Calculator & Checker
01
Toggle Read, Write, and Execute checkboxes for Owner, Group, and Public.
02
Read octal value (e.g. 755 or 644) and symbolic notation (rwxr-xr-x).
03
Inspect security warning if dangerous permissions (like 777) are selected.
Privacy Guarantee
File Permission (Chmod) Calculator & Checker runs 100% client-side in your web browser. Your data, passwords, keys, and files are processed using the Web Crypto API and never transmitted to any server. Zero telemetry, zero storage, zero cloud processing.
Frequently Asked Questions
Why is chmod 777 dangerous?
Chmod 777 allows any user or compromised process on the system to overwrite, delete, or inject malicious code into the file.
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