What is MIME type "image/avif"?

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

The image/avif MIME type identifies a modern image format that uses the AV1 codec for efficient compression.
It delivers high-quality images at smaller file sizes and supports both lossy and lossless methods.
Files using this type are marked by AVIF and AVIFS.

Used for web images to boost page speed and reduce bandwidth.
Ideal for apps needing efficient image storage with excellent detail.
Adopted in multimedia tools for both static and animated imagery.

Its advanced compression is often employed in modern browsers and imaging software.
Learn more about this format at Wikipedia on AVIF.

Associated file extensions

.avif, .avifs

Usage Examples

HTTP Header

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


    Content-Type: image/avif

HTML

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


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

Associated file extensions

.avif, .avifs

FAQs

Which browsers currently support the image/avif MIME type?

Most modern browsers, including Google Chrome, Mozilla Firefox, and Apple Safari (on recent iOS and macOS versions), natively support AVIF. However, Internet Explorer does not support it, so developers should use the HTML <picture> element to provide JPEG or PNG fallbacks for older clients.

How do I configure my web server to serve AVIF files correctly?

You must ensure the server sends the Content-Type: image/avif header. For Apache, add AddType image/avif .avif to your .htaccess file; for Nginx, add image/avif avif; to your mime.types file or types block.

What is the difference between image/avif and image/webp?

While both are modern formats, AVIF uses the newer AV1 codec, which generally provides better compression and quality than WebP (based on the VP8 codec). Although WebP has been around longer and has slightly wider support on legacy devices, AVIF is often preferred for maximum file size reduction.

Why is my browser downloading .avif files instead of displaying them?

This usually indicates a server misconfiguration where the MIME type is missing, causing the server to default to application/octet-stream. Verify that your server is configured to associate the .avif extension specifically with image/avif.

Does image/avif support transparency and animation?

Yes, the AVIF format supports an alpha channel for transparency (like PNG) and image sequences for animation (like GIF). While the extension .avifs is sometimes explicitly used for sequences, the standard MIME type image/avif covers both static and animated files.

How do I implement an AVIF image with a safe fallback in HTML?

Use the <picture> tag. Define the AVIF version in a source tag: <source srcset="image.avif" type="image/avif">, and place a standard <img> tag with a JPEG or PNG source immediately after it to ensure the image loads on browsers that don't recognize the format.

Can I edit AVIF files in standard image editors?

Support is growing, but not universal yet. GIMP and Paint.NET support AVIF natively or via plugins, while Adobe Photoshop often requires a third-party plugin. Alternatively, you can use online converters to switch to a more common format for editing.

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.