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Visually build Unix file permissions with toggle checkboxes and instant numeric and symbolic output.
The chmod Calculator is a visual Unix file permission builder. Toggle read, write, and execute checkboxes for Owner, Group, and Other to instantly generate the numeric octal value (like 755 or 644) and symbolic representation (like rwxr-xr-x). It also supports special bits (setuid, setgid, sticky) and reverse lookup — type any octal number to see the permission breakdown.
Check or uncheck the permission boxes for each user class. The numeric value and symbolic string update in real time. Use the preset buttons for common configurations like Web File (644), Web Directory (755), or Private Key (600). To decode a permission you already have, type the numeric value into the reverse lookup field.
Almost every developer deploying to Linux, setting up a Docker container, or configuring a CI/CD pipeline needs to look up chmod values. Memorizing which bits map to which numbers is tedious and error-prone. This tool makes it visual and instant.
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