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Chmod Calculator (Linux File Permissions)

Turn permissions like 755 into rwxr-xr-x (and back) and see in plain words who can read, write and run a file.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: Each digit is a group: owner, group, everyone else. 4 = read, 2 = write, 1 = run (execute); add them up. 644 for files and 755 for folders/scripts are the usual safe choices.

How to use it (step by step)

  1. 1Fill in the boxes: “Common choices”, “Permission (e.g. 755, 0644 or rw-r-----)”. Example numbers are already there so you can see how it works; replace them with yours.
  2. 2The result updates instantly as you type (on a phone it is below the boxes).
  3. 3The bold line is the main answer. Tap Copy next to any value to copy it.

Words to know

File permissions (chmod)
Linux rules for who can read, change or run a file: the owner, the group, and everyone else.

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