Calculator
Set Unix permissions visually, include special bits when needed, and read the matching octal, symbolic, and command output without manually translating each permission block.
Reset to 755
Jump back to the common default where the owner gets full access and group plus others get read and execute permissions.
Toggle read, write, and execute access for each subject. The outputs update together so you can compare octal and symbolic forms instantly.
Owner
The file owner or account that created the file.
Group
Users who belong to the file group.
Others
Everyone else on the system.
Use these only when you need SUID, SGID, or sticky bit behavior in the final chmod value.
Octal
755
Symbolic
rwxr-xr-x
Special digit
0
Ready command
chmod 755 <path>
Octal value
Symbolic value
Command
How to Use This Chmod Calculator
Use the matrix to set the exact permission pattern you want, then review the octal, symbolic, and full command output before you apply it on your system.
Toggle owner, group, and others permissions
Use the visual matrix to switch read, write, and execute access on or off for each permission group.
Include special bits if you need them
Turn on SUID, SGID, or sticky bit when you want a full 4-digit chmod value instead of only the basic three-digit form.
Review numeric, symbolic, and command output together
Check the octal value, the symbolic `rwx` string, and the ready-to-copy chmod command in one place.
Copy the format you need
Grab the octal value for quick reference or copy the full command directly into your shell workflow.
When This Tool Is Most Useful
It helps most when you are troubleshooting access problems, setting deployment permissions, preparing shared directories, or translating special-bit rules into a command you can trust.
Fix permission-denied errors
Quickly check whether a script, config file, or shared directory needs a different owner, group, or execute combination.
Understand directory permissions
See how owner, group, others, and sticky-bit combinations affect shared folders and deployment targets.
Generate exact chmod commands
Copy a precise command instead of manually translating from checkboxes to octal or symbolic form.
Review risky permission sets
Catch broad settings like `777` or powerful special-bit combinations before you apply them carelessly.
FAQs
Does this support SUID, SGID, and sticky bit?+
Yes. The calculator supports special bits and shows the full 4-digit chmod value when they are enabled.Can I copy a ready-to-run chmod command?+
Yes. The tool generates a command preview so you can copy a terminal-ready chmod line instead of only the octal value.What is this most useful for?+
It is useful for Linux and Unix permission checks, deployment work, troubleshooting permission errors, and learning how rwx bits combine.Why is chmod 777 risky?+
It gives read, write, and execute access to everyone, which is usually far broader than what a production file or directory should allow.