Chmod Calculator
Visually calculate Linux file permissions in octal and symbolic formats
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Owner
Group
Public
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Linux File Permissions
In Linux and Unix-like operating systems, the chmod (change mode) command determines who can access or modify a file. Permissions are broken down into three entities: Owner (the creator), Group (users in the same group), and Public (everyone else).
Each entity can be granted Read (4), Write (2), or Execute (1) permissions. These numeric values are added together to create an Octal format. For example, a setting of 755 gives the Owner full rights (4+2+1 = 7), while the Group and Public can only Read and Execute (4+1 = 5). This visual calculator helps you quickly generate these numbers safely and accurately.