Calendar, time-zone, and inclusion rules are calculated separately.
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Code & file security
Unix Permission Calculator
Converts Unix permissions such as 755, 0644, or rwxr-xr-x, explains owner/group/other access, and flags world-writable or special-bit risk. It never changes server permissions.
✓ Free✓ No account✓ In-browser
QUICK ANSWER
What does this tool do?
Convert chmod octal and rwx notation both ways and explain risky bits.
APPLICATION AND DECISION GUIDE
Unix Permission Calculator: method and usage
Converts Unix permissions such as 755, 0644, or rwxr-xr-x, explains owner/group/other access, and flags world-writable or special-bit risk. It never changes server permissions.
a date, time, duration, or schedule with an explicit format and time zone Confirm the shape first with a small example containing no personal data.
a normalized temporal value, calculation summary, and ambiguous-zone warnings
Practical steps
- Enter octal or rwx notation.
- Review the conversion and access matrix.
- Verify file purpose and threat model before applying changes.
UTC equivalence, daylight-saving transitions, boundary dates, and applicable official calendar rules
Code is not executed, and no finding does not prove the absence of vulnerabilities.
Suitable use cases
- Preparing chmod commands
- Reviewing deployment file permissions
- Learning Linux permission notation
LEARN THE WORKFLOW
Guides for this tool
Local Security Pre-Checks for .env, SQL, and Unix Permissions
Surface common configuration, query, and permission risks before release without exposing secrets.
Read guide →PWA Installation and Offline Caching: A Privacy-First Design Guide
Understand web app installation, the service worker lifecycle, and cache boundaries that keep sensitive inputs out of persistent storage.
Read guide →ABOUT THIS TOOL
Frequently asked questions
What input does Unix Permission Calculator accept?+
a date, time, duration, or schedule with an explicit format and time zone Enter octal or rwx notation.
What does Unix Permission Calculator return?+
a normalized temporal value, calculation summary, and ambiguous-zone warnings Calendar, time-zone, and inclusion rules are calculated separately.
How should I validate Unix Permission Calculator output?+
UTC equivalence, daylight-saving transitions, boundary dates, and applicable official calendar rules
Does Unix Permission Calculator send or store input on a server?+
Tool input is processed in the active tab. Saving to the Workstation or transferring to another tool is a separate choice. Consider browser extensions and shared devices separately; the privacy page explains advertising and network connections.