RU

Chmod Calculator Online

Visual Unix permissions calculator with format conversion

chmod-calculator
PermissionReadWriteExecute
Owner
Group
Other
chmod 755 filename

Common Permissions

CHMOD755rwxr-xr-x
Was this tool helpful?
☑

Visual Grid

Intuitive 3x3 checkbox grid for owner/group/other

7

Octal Format

Input and display permissions as 755, 644, 777

rwx

Symbolic Format

Display permissions as rwxr-xr-x

⚡

Common Presets

Quick access to frequently used permission combinations

Related Tools

JSON Formatter

Format, validate and view JSON

.*

Regex Tester

Test, replace and validate regular expressions

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes

Cron Expression Builder

Visual cron expression builder and parser

Frequently Asked Questions

Chmod (change mode) is a Unix/Linux command for changing file and directory permissions. It controls who can read, write, and execute a file: the owner, the group, or all other users.
Every file has three permission sets: for the owner, the group, and others. Each set can include read (r), write (w), and execute (x). These permissions determine what actions are allowed on the file.
Octal notation (e.g., 755) represents permissions as three digits, where each digit is the sum of: read (4) + write (2) + execute (1). Symbolic notation (e.g., rwxr-xr-x) shows each permission as an individual character.
The most common ones are: 644 (rw-r--r--) for regular files, 755 (rwxr-xr-x) for executables and directories, 600 (rw-------) for sensitive files, and 777 (rwxrwxrwx) for full access to everyone.