What is a MIME type?
A MIME type describes the format of data, for example image/png, application/pdf, or text/csv.
File
MIME Type Detector
Detect a file MIME type using its filename, browser-reported type, and supported file signatures directly in your browser.
Tool
MIME Type Detector
Detect a file MIME type using its filename, browser-reported type, and supported file signatures directly in your browser.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this free MIME Type Detector to identify the likely media type of a file. The tool can compare the filename extension, the MIME type reported by the browser, and supported file signatures found in the file contents. This helps detect missing extensions, incorrect extensions, and mismatches between a filename and its actual format. Analysis runs locally in your browser.
Examples
- image.png → image/png
- document.pdf → application/pdf
- data.json → application/json
Frequently Asked Questions
Can a file extension be incorrect?
Yes. A filename extension can be renamed or missing. Reading a supported file signature can provide stronger evidence of the actual format.
Is my file uploaded?
No. MIME type detection is designed to run locally in your browser.