File MIME Type Checker – Detect File Type Online
Free MIME type checker. Upload a file to detect its real MIME type and format, regardless of the file extension. Useful for developers and uploads.
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File mime type checker – Free Online Tool
Our free File MIME Type Checker reveals the real type of a file. Upload any file and see its MIME type, so you know what it actually is — even if the extension is wrong or missing.
What is File mime type checker?
A MIME type (media type) is a standard label such as image/jpeg, application/pdf or text/html that tells browsers and servers how to handle a file.
File extensions can be renamed easily, but the MIME type detected from a file’s content is far more reliable. Wrong MIME types cause broken downloads, rejected uploads and security warnings.
How to use the File mime type checker
- Upload or drag and drop your file.
- Wait while the file is analysed.
- Read the detected MIME type.
- Use it to configure your server, upload rules or code.
Key features
- Detects MIME type from file content
- Works with images, documents, audio, video and archives
- Fast results
- Free and easy
Common use cases
- Checking why an upload form rejects a file
- Configuring correct Content-Type headers
- Identifying files with missing extensions
- Validating file types in web apps
Frequently asked questions
What is the MIME type for PDF?
application/pdf.
Can renaming a file change its MIME type?
No. Renaming changes only the extension, not the content.
Why does MIME type matter for websites?
Servers must send the correct Content-Type so browsers display or download files properly.
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