Chmod Calculator — Linux File Permissions Made Clear
Click the grid or type 755, rwxr-xr-x, u+x or an ls -l line. See what it means, what's risky and the exact command to run.
Help shape Chmod Calculator — Linux File Permissions Made Clear
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Frequently Asked Questions
755 lets the owner read, write and execute, and everyone else read and execute. It's the usual mode for directories, scripts and binaries.
644 (rw-r--r--) is for regular files: only the owner can edit and nobody can execute. 755 adds execute for everyone, needed for scripts and to enter directories.
Private keys must be readable only by you. Use chmod 600 on the key file and chmod 700 on the ~/.ssh folder.
Almost never. 777 lets any user on the system change or replace the file. Use 755 or 775 with the right group instead.
umask removes permissions from new files and folders. With the common 022, new files become 644 and new directories 755.
No. The calculator runs entirely in your browser and works offline.