1. 01Choose the local file to inspect
2. 02Read its header and basic properties
3. 03Review the detected type, MIME, and extension comparison
4. 04Use the result to decide whether to rename it or open it with the correct application

For example, if report.jpg contains a PDF signature, the tool can flag that the extension and detected type do not match.

• Signature detection covers known patterns and is not a substitute for full format parsing or malware scanning
• Some container formats share signatures and require deeper structure for exact identification

• Identify a file that has no extension
• Check whether an extension matches the file signature
• Investigate why a downloaded file will not open normally
• Detect a simple extension-based disguise

File identification runs locally in the browser by default and does not automatically upload the file.