What is Chmod Calculator?

Calculate Unix/Linux file permissions with an interactive 3x3 checkbox grid for owner, group, and others. Instantly converts between octal (e.g. 755) and symbolic (e.g. rwxr-xr-x) notation. Includes common presets (644, 755, 600, 700, 777, 400, 444, 666). Copy the chmod command directly. All processing runs in your browser — zero backend.

Key Features

• 100% client-side — your data never leaves your browser
• No signup or installation required
• Free and open to use, no usage limits