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Chmod Calculator
Calculate Unix file permissions with an interactive chmod builder
Permission Matrix
| Entity | Read (4) | Write (2) | Execute (1) | Value |
|---|---|---|---|---|
| Owner | 7 | |||
| Group | 5 | |||
| Others | 5 |
Generated Permissions
Numeric (Octal)
755Symbolic
rwxr-xr-xCommand
chmod 755 filenamePermission Breakdown
Owner
7rwxReadWriteExecute
Group
5r-xReadWriteExecute
Others
5r-xReadWriteExecute
Common Permissions Reference
| Octal | Symbolic | Meaning |
|---|---|---|
777 | rwxrwxrwx | Full access for everyone |
755 | rwxr-xr-x | Owner full, others read and execute |
750 | rwxr-x--- | Owner full, group read and execute |
700 | rwx------ | Owner full access only |
666 | rw-rw-rw- | Read and write for everyone |
644 | rw-r--r-- | Owner read/write, others read only |
600 | rw------- | Owner read/write only |
555 | r-xr-xr-x | Read and execute for everyone |
444 | r--r--r-- | Read only for everyone |
400 | r-------- | Owner read only |
What is Chmod Calculator?
Calculate Unix/Linux file permissions using an interactive visual interface. Toggle read, write, and execute permissions for owner, group, and others, and see the numeric (octal) and symbolic chmod notation update in real time. Includes common permission presets like 755, 644, and 777, plus a reference table of common permission patterns. Essential for system administrators and backend developers.
How to Use Chmod Calculator
- 1Toggle read, write, and execute permissions for owner, group, and others
- 2See the numeric (octal) and symbolic notation update in real time
- 3Use preset buttons for common permissions (755, 644, etc.)
- 4Copy the chmod command to use in your terminal
Frequently Asked Questions
chmod (change mode) is a Unix/Linux command used to set file and directory permissions. It controls who can read (r), write (w), and execute (x) files. Permissions are set for three groups: the file owner (user), the group, and all other users.
chmod 755 gives the owner full permissions (read + write + execute = 7), and gives the group and others read and execute permissions (read + execute = 5). In symbolic notation, this is rwxr-xr-x. It is the most common permission for executable files and directories.
Numeric notation uses three octal digits (e.g., 755). Each digit represents permissions for user, group, and others. Symbolic notation uses letters: r (read=4), w (write=2), x (execute=1) for each group (e.g., rwxr-xr-x). Both represent the same permissions.
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