CHMOD Calculator
Convert File Permissions Easily (Linux & Unix)
Managing file permissions is a critical skill for Linux and Unix system administrators, developers, and DevOps engineers. A small mistake in permissions can lead to security risks or application failures.
That’s why a CHMOD Calculator is an essential tool to quickly and accurately convert file permission values.
This page helps you calculate, understand, and apply CHMOD permissions without memorizing complex numeric values.
How to Use This CHMOD Calculator
Using this CHMOD Calculator is simple:
- Select permissions for Owner, Group, and Others
- Choose Read, Write, and Execute options
- Instantly see the numeric CHMOD value
- Copy the result and apply it using the
chmodcommand
No installation, no login, completely free.
rwxr-xr--
chmod 754 filename
Permission Reference
| Number | Permission | Symbol |
|---|---|---|
| 0 | No permission | --- |
| 1 | Execute | --x |
| 2 | Write | -w- |
| 3 | Write + Execute | -wx |
| 4 | Read | r-- |
| 5 | Read + Execute | r-x |
| 6 | Read + Write | rw- |
| 7 | Read + Write + Execute | rwx |
Common Permissions
755
Standard file/directory
644
Regular file
777
Full access (not recommended)
600
Private file
Best Practices for CHMOD Permissions
To keep your system secure:
- Avoid using 777 unless absolutely necessary
- Use 755 for directories
- Use 644 for configuration or web files
- Limit write access to the owner only
- Regularly audit file permissions
Proper permissions reduce the risk of unauthorized access and system compromise.
Other Linux/Unix tools:
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