What is MIME type "image/flif"?

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

image/flif is the MIME type for files using the Free Lossless Image Format (FLIF).
This format compresses images without any loss of quality. It keeps all original image data intact while reducing file size.
It is designed to offer better efficiency than older lossless formats such as PNG.

Supports progressive decoding for faster image previews.
Maintains high-quality visuals, including transparency.
Ideal for archival storage and web graphics where lossless detail is needed.

For further details, you can visit the official FLIF website.

Associated file extensions

.flif

Usage Examples

HTTP Header

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


    Content-Type: image/flif

HTML

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


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

Associated file extensions

.flif

FAQs

Which web browsers natively support image/flif?

Currently, no major web browsers (Chrome, Firefox, Safari, Edge) provide native support for image/flif. To display FLIF images on a website, developers typically use a JavaScript decoder (polyfill) that renders the image onto an HTML5 <canvas> element.

How do I configure Apache to serve FLIF files correctly?

You need to add the MIME type association to your .htaccess file or main configuration. Add the line AddType image/flif .flif to ensure the server sends the correct header, allowing browsers or scripts to identify the content as the Free Lossless Image Format.

Is FLIF better than PNG for web use?

FLIF generally offers significantly better compression ratios than image/png while remaining lossless. However, due to the lack of native browser support and the high CPU cost of JavaScript decoding, PNG or modern alternatives like WebP and AVIF are usually more practical for production websites.

What software can open or view .flif files?

Standard operating system image viewers usually do not support .flif files out of the box. You can use advanced image viewers like XnView MP, IrfanView (with plugins), or the command-line tool ImageMagick to view or convert these images.

What is the relationship between FLIF and JPEG XL?

FLIF is considered a predecessor to JPEG XL. The development of FLIF stalled as its concepts and technology were merged into the ISO standard for JPEG XL (image/jxl). Consequently, users looking for the next generation of lossless compression are encouraged to look toward JPEG XL.

How do I add FLIF support to Nginx?

Open your mime.types file (usually located in /etc/nginx/) and add the entry image/flif flif;. After saving the file, reload the Nginx service using sudo nginx -s reload to apply the changes.

What does 'progressive decoding' mean for image/flif?

Progressive decoding allows a image/flif file to be displayed as a low-quality preview almost immediately, which refines to full quality as the rest of the file downloads. Unlike image/jpeg which usually loads top-to-bottom, FLIF improves the detail of the entire image at once.

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.