AI Tools Finder
Home › Dev Tools › Chmod Calculator

Chmod Calculator

Calculate Unix permissions: check r/w/x for owner/group/other to get the octal number and rwx notation.

Calculate chmod permissions for Linux files/directories — check the read/write/execute boxes to get the octal number (e.g. 755, 644).

How to use Chmod Calculator

  1. Check the permissions for owner, group, and other.
  2. Read the corresponding chmod number.
  3. Use it in a chmod command.

Frequently asked questions

What's the difference between 755 and 644?

755 lets the owner write and lets everyone read/execute (commonly used for directories and scripts); 644 lets the owner write while everyone else can only read (commonly used for regular files).

Related tools

JSON Format / Validate Format, validate, and minify JSON. Highlights syntax errors. JSON ↔ YAML Two-way conversion between JSON and YAML (supports maps, lists, nesting, and scalars). JSON ↔ CSV Convert an array of objects to and from CSV (correctly handles commas, double quotes, and line breaks inside cells). JSON ↔ XML Two-way JSON ↔ XML conversion. Attributes use @, text content uses #text. JSON → TypeScript Generate a TypeScript interface from a JSON sample (merges keys, infers types, handles nesting). SQL Formatter Format SQL statements: capitalizes keywords, breaks lines by clause, and indents AND/OR/ON.
🔒 Chmod Calculator runs entirely in your browser — the data you enter is not sent to any server. Free, no sign-up required. See145 free dev tools more.