A Developer's Guide to the File Type Detector

The File Type Detector is a powerful utility that identifies the true type of a file by reading its binary content, not by relying on its extension. This method, which uses "magic numbers" (the first few bytes of a file), is far more reliable than just looking at the filename.

Features

• Binary Signature Analysis: The tool checks the uploaded file's initial bytes against a database of known magic numbers for common file types.
• Reliable Identification: Accurately identifies file types like JPEG, PNG, PDF, ZIP, and many more, even if they have been renamed with the wrong extension.
• Detailed Information: For a detected file, the tool provides:
  • The identified Type (e.g., "PNG").
  • The common Extension (e.g., .png).
  • The official MIME Type (e.g., image/png).
  • A brief Description.
• Client-Side Processing: Your file is never uploaded to a server. All analysis is done securely and privately within your browser.
• Fallback Information: If a file's signature is not recognized, the tool will still display the information provided by your browser (filename and browser-detected MIME type).

How to Use

1. Select a File: Click the "Select File" button and choose any file from your computer.
2. View the Results: The tool will instantly process the file.
   • If a known signature is found, the cards will populate with the detected file type information.
   • If the signature is unknown, it will be clearly stated, and the browser's best guess will be shown instead.