Chmod calculator
Compute Unix permissions (octal ↔ symbolic): read, write, execute.
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Calculate Unix/Linux permissions easily by converting between octal (755, 644) and symbolic (rwxr-xr-x) notation. Tick read, write and execute rights for owner, group and others, and get the matching chmod command. The calculation runs 100% in your browser, with no data sent.
FAQ
What does chmod 755 mean?
755 gives the owner full rights (read, write, execute) and gives the group and others read and execute. It is a common setting for folders and executable scripts.
What is the difference between octal and symbolic notation?
Octal notation uses digits (e.g. 644), while symbolic notation uses letters (e.g. rw-r--r--). Both describe the same read (r), write (w) and execute (x) permissions.
How do I calculate a chmod permission value?
Add read (4), write (2) and execute (1) for each category: owner, group, others. For example 4+2+1=7 for all rights, giving 7 per digit.
Which permission should I use for a folder or a file?
755 usually suits folders and scripts, 644 suits non-executable files. Avoid 777, which grants all rights to everyone and creates security risks.