Mime Type Lookup
Mime Type Lookup running client-side on your device.
Your files and data are processed locally and never leave your device.
Select any file to inspect
Inspect MIME types, exact file size, and compute cryptographic file hashes
What is Mime Type Lookup?
MIME Type Lookup is a comprehensive reference directory of over 1,000+ standard IANA MIME types and corresponding file extensions. Search by extension (e.g. .webp, .wasm, .json) or MIME header (e.g. application/pdf) with 1-click copying.
Unlike legacy online utilities that upload sensitive media and documents to remote cloud storage, Shadow Toolkit executes this entire operation directly within your browser's local runtime. Your raw data never crosses the network.
Key Capabilities
- Searchable database of 1,000+ standard IANA and common web MIME types
- Bidirectional lookup: Search by file extension or by MIME Content-Type header string
- Includes HTTP Content-Type headers, associated software, and binary classifications
- 1-Click 'Copy MIME Type' button for Nginx, Apache, and API development
- 100% client-side instant search
Common Use Cases
How to use Mime Type Lookup
Search Extension or MIME
Type an extension (e.g. 'webp') or MIME type (e.g. 'application/json').
Browse Matches
Inspect the matching MIME type, description, and related extensions.
Copy MIME Header
Copy the formatted Content-Type string.
Export Diagnostic Report
Review the binary inspection headers, verify checksums, and copy the technical report or rename file extensions accordingly.
Frequently Asked Questions
Web browsers rely on the HTTP 'Content-Type' header, not the file extension, to determine whether to execute JavaScript, render an image, or download a file.