What is MIME type "image/x-faxx"?

A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.

image/x-faxx is a non‐standard MIME type. It tags image files that use the specialized IFF‐FAXX format. This format is mainly for fax image data.

The x- prefix indicates a vendor-specific or experimental format. It is not a widely adopted modern standard. Specialized or legacy fax software may be required to display these files correctly.

Main purpose: To encapsulate fax image data within an IFF container.
Usage context: Seen in older or specialized fax processing systems.
Technical note: The format is experimental. Its support can vary by application.
File type: Files using this MIME type are linked with the FAXX extension.

For more on MIME types, check the IANA Media Types Reference.

Associated file extensions

.faxx

Usage Examples

HTTP Header

When serving content with this MIME type, set the Content-Type header:


    Content-Type: image/x-faxx

HTML

In HTML, you can specify the MIME type in various elements:


    <a href="file.dat" type="image/x-faxx">Download file</a>

Server-side (Node.js)

Setting the Content-Type header in Node.js:


    const http = require('http');    
    
    http.createServer((req, res) => {    
      res.setHeader('Content-Type', 'image/x-faxx');    
      res.end('Content here');    
    }).listen(3000);

Associated file extensions

.faxx

FAQs

What kind of file uses the image/x-faxx MIME type?

The image/x-faxx MIME type is associated with files using the IFF-FAXX format. These are typically legacy or specialized fax image files encapsulated within an Interchange File Format (IFF) container, distinguished by the .faxx extension.

Do modern web browsers support image/x-faxx?

No, standard web browsers like Chrome, Firefox, and Edge do not natively display image/x-faxx files. If a server sends this MIME type, the browser will usually trigger a file download rather than displaying the image inline.

How do I configure Apache to serve .faxx files correctly?

You can map the file extension to the MIME type in your .htaccess file or main configuration. Add the line: AddType image/x-faxx .faxx. This ensures the server sends the correct header to the client.

How do I add image/x-faxx support to Nginx?

In your nginx.conf or the mime.types file, add the entry inside the types block: image/x-faxx faxx;. Reload Nginx to apply the changes so the server recognizes files with the .faxx extension.

Why does this MIME type start with x-?

The x- prefix indicates that image/x-faxx is a non-standard, experimental, or vendor-specific type. It is not a registered standard with the IANA, unlike common types such as image/png or image/jpeg.

What should I do if I need to display a .faxx file on a website?

Since browser support is non-existent, you should convert the file to a standard web-friendly format. Converting the content to image/tiff (often used for faxes) or image/png is recommended for broad compatibility.

Is image/x-faxx the same as image/tiff?

No, while both can store fax data, they are different formats. TIFF is a widely supported standard, whereas image/x-faxx uses the specific IFF structure. Most modern fax systems rely on image/tiff rather than the experimental FAXX format.

General FAQ

What is a MIME type?

A MIME (Multipurpose Internet Mail Extensions) type is a standard that indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.

MIME types are important because they help browsers and servers understand how to process a file. When a browser receives a file from a server, it uses the MIME type to determine how to display or handle the content, whether it's an image to display, a PDF to open in a viewer, or a video to play.

MIME types consist of a type and a subtype, separated by a slash (e.g., text/html, image/jpeg, application/pdf). Some MIME types also include optional parameters.

How do I find the MIME type for a file?

You can check the file extension or use a file identification tool such as file --mime-type on the command line. Many programming languages also provide libraries to detect MIME types.

Why are multiple MIME types listed for one extension?

Different applications and historical conventions may use alternative MIME identifiers for the same kind of file. Showing them all helps ensure compatibility across systems.