What is MIME type "image/heif"?

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

image/heif is a MIME type for files that use the High Efficiency Image File Format. This format uses advanced compression techniques, like HEVC, to store images in smaller files without losing quality.

It can hold a single image or a series of images. This makes it useful for burst photos and short sequences. The format also supports metadata and multiple image layers.

Efficiency: Reduces file size compared to older formats.
Quality: Maintains higher image quality with modern compression.
Flexibility: Can store multiple images and useful data in one file.

Files using this format typically have extensions like HEIC, HIF, HEIF, HEICS, and HEIFS.

For more technical details, visit this reference.

Associated file extensions

.heic, .hif, .heif, .heics, .heifs

Usage Examples

HTTP Header

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


    Content-Type: image/heif

HTML

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


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

Associated file extensions

.heic, .hif, .heif, .heics, .heifs

FAQs

Which web browsers support image/heif natively?

Currently, Safari (on macOS and iOS) is the primary browser with full native support for image/heif. Chrome, Firefox, and Edge have limited or no native support for displaying HEIF images directly in web pages without third-party extensions or flags. For maximum web compatibility, it is recommended to convert these files to image/webp or image/jpeg.

How do I configure Apache or Nginx to serve HEIF files correctly?

To ensure browsers handle the file correctly, you must set the MIME type in your server configuration.

Apache: Add AddType image/heif .heif .heic to your .htaccess or config file.
Nginx: Add image/heif heif heic; to your mime.types file and reload the server.

What is the difference between image/heif and image/heic?

While often used interchangeably, the distinction lies in the specific codec used within the container. image/heif is the standard MIME type for the High Efficiency Image File Format container. However, if the image is specifically encoded using HEVC (as is common on Apple devices), the MIME type image/heic is often used to explicitly indicate the codec requirement.

Why can't I open HEIF/HEIC files on Windows?

Windows 10 and 11 do not always support image/heif out of the box. You typically need to install the HEIF Image Extensions and HEVC Video Extensions from the Microsoft Store to view these files in the Photos app. Alternatively, you can convert the file to a standard format like image/png.

Should I use .heif or .heic as the file extension?

The extension .heic is most commonly used by Apple devices and implies the image is encoded with HEVC. The extension .heif is the more generic extension for the container format. If you are targeting Apple ecosystems or mobile photography workflows, .heic is the standard convention; for general archival, .heif is acceptable.

Is image/heif better than JPEG?

Technically, yes; image/heif offers significantly better compression (smaller file sizes) and supports higher color depth (16-bit vs 8-bit) compared to image/jpeg. It also supports transparency and image sequences. However, JPEG remains superior in terms of universal compatibility across all software and browsers.

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.