What is MIME type "audio/flac"?

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

audio/flac is the MIME type for files encoded in the Free Lossless Audio Codec. It compresses audio without any quality loss, preserving every detail of the original recording.
This format is tailored for high-fidelity sound and is popular among audiophiles and professionals alike.
It offers lossless compression, meaning that when you play a file, the sound is identical to the original studio master.

High Fidelity – Keeps the exact sound quality of the source.
Efficient Storage – Reduces file size without sacrificing audio detail.
Wide Compatibility – Supported by many media players and editing tools.
Archival Quality – Ideal for storing master recordings and high-quality backups.

Files using this MIME type often have the FLAC or FLA extension.
For more detailed information, visit the official FLAC website.

Associated file extensions

.flac, .fla

Usage Examples

HTTP Header

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


    Content-Type: audio/flac

HTML

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


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

Associated file extensions

.flac, .fla

FAQs

What is the correct MIME type for FLAC files?

The standard IANA-registered MIME type is audio/flac. While you might occasionally see the non-standard audio/x-flac used in older systems, you should always configure your applications and servers to use audio/flac for maximum compatibility.

Do all web browsers support audio/flac playback?

Most modern browsers, including Chrome, Firefox, Edge, and Safari (on newer macOS and iOS versions), support native FLAC playback via the HTML5 <audio> element. However, Internet Explorer does not support this MIME type.

How do I configure Apache to serve FLAC files?

You can enable the correct MIME type by adding the following line to your .htaccess file or main configuration: AddType audio/flac .flac. This ensures the server sends the correct Content-Type header instead of defaulting to a generic binary type.

How do I set up Nginx to handle the audio/flac MIME type?

In your nginx.conf or mime.types file, ensure the mapping exists within the types block: types { audio/flac flac; }. Reload Nginx after saving the file to apply the changes.

Why is my FLAC file downloading instead of playing in the browser?

This often happens if the server sends the file as application/octet-stream instead of audio/flac. Verify your server headers; if the MIME type is incorrect, the browser treats the file as a generic download rather than media to be played.

Is audio/flac better than audio/mpeg (MP3) for web streaming?

It depends on the use case. audio/flac offers lossless quality but results in significantly larger file sizes, which requires more bandwidth. For general web streaming, audio/mpeg or audio/aac is usually preferred for efficiency, while FLAC is best for audiophile or archival applications.

What file extensions map to audio/flac?

The primary extension is .flac. While the extension .fla is sometimes listed, it is rarely used for audio and is more commonly associated with Adobe Animate source files, so stick to .flac to avoid confusion.

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.