Image MIME Reference

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JPEG-XR

JPEG XR (Extended Range) MIME Type Reference

image/jxr Released 2006 · by Microsoft

JPEG XR (formerly HD Photo and Windows Media Photo) is an image compression standard developed by Microsoft. It offers better compression than standard JPEG, supports both lossless and lossy compression, and features native support for high dynamic range (HDR), deep color, and transparency.

Professional & Broadcast Imaging Transparency Progressive ✦ HDR Production Ready

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Technical Specifications

MIME Type

image/jxr

Extensions

.hdp.jxr.wdp

Container

TIFF-like (JPEG XR)

Compression

Lossy & Lossless

Algorithms

Lapped Biorthogonal Transform (LBT)

Color Depth

8-bit, 16-bit, 32-bit (Float/Fixed)

Metadata

EXIF XMP ICC

Capabilities

Transparency

Animation

Progressive Loading

Alpha Channel

HDR Support

Official Specification

Aliases: image/vnd.ms-photoimage/x-ms-bmpimage/x-ms-photo

Magic Bytes & HTTP Headers

File Signature (Magic Bytes)

Copy

49 49 BC 01

ASCII: II¼.

HTTP Headers

Content-Type: image/jxr

Content-Type: image/vnd.ms-photo

HTML Accept Attribute

accept="image/jxr, image/vnd.ms-photo, .jxr, .wdp, .hdp"

Browser Support Matrix

Browser	Status	Min Version
Chrome	Not Supported	—
Firefox	Not Supported	—
Safari	Not Supported	—
Edge	Not Supported	—
Internet Explorer	Supported	Legacy

Advantages & Limitations

Advantages

• Provides approximately half the file size of standard JPEG at equivalent visual quality
• Extensive support for high dynamic range (HDR) and deep color (up to 32-bit floating point per channel)
• Native support for alpha channel transparency and lossless compression modes

Limitations

• Failed to gain cross-platform traction and is entirely unsupported in modern web browsers
• Effectively obsolete and superseded by modern, cross-platform formats like WebP, AVIF, and HEIC
• Encoding and decoding complexity is higher than standard JPEG

Developer Code Snippets

Python Node.js Go PHP

Copy

import magic
print(magic.from_file('photo.jxr', mime=True)) # May output 'image/vnd.ms-photo' or 'image/jxr'

const FileType = require('file-type');
const type = await FileType.fromFile('photo.jxr');
console.log(type.mime); // image/jxr

import "net/http"
// Requires custom byte checking: bytes.HasPrefix(buf, []byte{0x49, 0x49, 0xBC, 0x01})

$mime = mime_content_type('photo.jxr');
echo $mime; // image/jxr or image/vnd.ms-photo

File Detection Steps

How to programmatically detect a image/jxr file by reading its raw bytes:

1. 1 Check the first 4 bytes for the magic signature 49 49 BC 01

Software Support

W

Windows Photo Viewer

A

Adobe Photoshop (with plugin)

ImageMagick

X

XnView

Free Online Tools for JPEG-XR

Free Image Resizer

Editor

Resize, scale, crop, and modify dimensions for any photo or graphic.

Open Tool

Image Metadata Remover

Privacy

Clean EXIF, camera, lens, and location tags from your photos.

Open Tool

WebP to JPG Converter

Universal

Convert modern web images to universal high-compatibility JPG.

Open Tool

Compress WebP Images

Optimizer

Reduce image file sizes for faster web performance.

Open Tool

JPEG-XR Format Comparisons

JPEG-XR vs JPEG-XR-HEIF JPEG-XR vs JPEG-XR-Sequence JPEG vs JPEG-XR JPEG-XR vs WebP JPEG-XR vs TIFF JPEG-XR vs PNG AVIF vs JPEG-XR GIF vs JPEG-XR JPEG-XR vs SVG HEIC vs JPEG-XR BMP vs JPEG-XR JPEG-XR vs JXL

View all format comparisons

Share & Embed

Markdown Badge

[![JPEG-XR Format](https://freewebptojpg.com/mime/image/jpeg-xr/badge.svg)](https://freewebptojpg.com/mime/image/jpeg-xr)

Interactive iframe Widget

<iframe src="https://freewebptojpg.com/mime/image/jpeg-xr/embed" width="100%" height="280" style="border:1px solid #cbd5e1;border-radius:8px;" title="JPEG-XR Specs"></iframe>

JSON API

All data on this page is available as a free, open JSON API. Use it in your project, documentation, or tooling.

GET https://freewebptojpg.com/mime/image/jpeg-xr.json Copy URL Open JSON

Free to use

No auth required

CORS enabled

Use from any domain

Cached 24h

Cache-Control headers set

Frequently Asked Questions

What is the difference between JPEG and JPEG XR?

JPEG XR is a more advanced, newer format developed by Microsoft that supports 16-bit and 32-bit color depths, alpha channels (transparency), and mathematically lossless compression, all of which standard JPEG lacks.

What is the magic byte for a JPEG XR file?

JPEG XR files use a TIFF-like directory structure and always begin with the byte sequence 49 49 BC 01 (hex), which roughly translates to 'II¼.' in ASCII.

Do modern web browsers support JPEG XR?

No. Native support for JPEG XR was strictly limited to Microsoft's Internet Explorer (IE9+) and legacy Edge (EdgeHTML). Modern Chromium-based Edge, Chrome, Safari, and Firefox do not support it, making it obsolete for web delivery.

Related Formats

JPEG-XR-HEIF JPEG-XR-Sequence JPEG WebP TIFF