Chmod Linux Permissions Calculator
Developer utilities: formatters, validators, encoders, and testers.
What does this tool do?
Stop guessing chmod numbers. Tick read, write and execute for owner, group and others - including setuid, setgid and sticky bits - and get the octal code plus symbolic notation, or type an octal to see the checkboxes.
Key features
- Syntax validation
- Format & minify
- Error highlighting
- Copy formatted output
Stop guessing chmod numbers. Tick read, write and execute for owner, group and others - including setuid, setgid and sticky bits - and get the octal code plus symbolic notation, or type an octal to see the checkboxes.
Permissions
Result
How to Use
- Tick the read, write and execute checkboxes for owner, group and others (plus special bits if needed).
- Read the octal number and symbolic notation instantly, with a ready chmod command.
- Or type an octal like 644 and click Apply to see which checkboxes it sets.
Core Features
- Two-way conversion: checkboxes to octal AND octal to checkboxes
- Full support for setuid, setgid and sticky special bits
- Generates the exact chmod terminal command to copy
- Explains symbolic notation (rwxr-xr-x) - 100% client-side
Frequently Asked Questions
What do the numbers in chmod 755 mean?
Each digit is owner, group, others. Values add up: read=4, write=2, execute=1. So 7 = 4+2+1 (rwx), 5 = 4+1 (r-x). 755 means the owner can do everything while everyone else can read and execute.
When do I need setuid, setgid or sticky?
Rarely for normal files. Setuid/setgid let a program run with the file owner or group privileges; the sticky bit on directories (like /tmp) stops users deleting files owned by others. Most web files just need 644/755.
How to Use Chmod Linux Permissions Calculator
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