What is MIME type "image/jbig"?

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

The image/jbig MIME type defines files that use the JBIG compression algorithm. JBIG is a method that compresses bi-level images—those with only two colors, like black and white. This makes it ideal for documents such as scanned texts and faxes.

JBIG compression is typically lossless. It retains the original details while significantly reducing file sizes. This is useful when storage space is limited or fast transmission is needed.

Files using image/jbig often come in formats like JBG, JBIG, and BIE. They are common in environments where high-quality, binary image preservation is critical.

• Efficient compression for high-contrast, two-tone images.
• Ideal for scanned documents and fax transmissions.
• Helps in digital archiving by reducing storage demands.

This MIME type remains useful in specialized document imaging and archival systems, even though it is not as common as formats for full-color images.

Associated file extensions

.jbg, .jbig, .bie

Usage Examples

HTTP Header

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

    Content-Type: image/jbig
  

HTML

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

    <a href="file.dat" type="image/jbig">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/jbig');
      res.end('Content here');
    }).listen(3000);
  

Associated file extensions

.jbg, .jbig, .bie