An AIFF file is an uncompressed audio format that stores sound in high quality, mainly used by music producers and professional audio engineers

AIFF stands for Audio Interchange File Format. It was created by Apple in 1988 and works similarly to a WAV file on Windows — both store audio without squeezing it down, which means the file takes up more space but sounds exactly as it was recorded. You will most often see AIFF files if you work with music production software, download audio from professional sources, or receive sound files from someone in the music industry.

The main thing to understand is that AIFF is lossless, meaning no sound information is thrown away to make the file smaller. When you listen to an MP3 or AAC file (the format on most phones), the software removes parts of the sound that human ears typically cannot detect, shrinking the file to a fraction of its original size. AIFF keeps everything, so a five-minute song in AIFF format might be 50 megabytes, while the same song as an MP3 might be only 5 megabytes.

Key Takeaways

  • AIFF files store audio without compression, so they take up much more space than MP3 or AAC files but preserve every detail of the original recording.
  • Most people never need to work with AIFF files unless they are involved in music production, audio editing, or receiving files from professional musicians.
  • Your phone, tablet, or standard media player may not recognize AIFF files without additional software, but most computers can play them with free programs.
  • If you have an AIFF file and want to share it with someone or use it on a phone, converting it to MP3 or AAC will make it much smaller and more portable.

Why AIFF exists and who uses it

AIFF was designed for a world where storage space was expensive and internet speeds were slow, yet quality mattered more than file size. Music studios, record labels, and audio engineers chose AIFF because it let them work with the highest-quality version of a recording without any loss. When a producer records a song, edits it, adds effects, and mixes it, they want to work with the best possible version at every step. AIFF is ideal for that.

Today, AIFF is still the standard in professional music production. If you download a song from a music production website, receive audio files from a recording studio, or work with music software like Logic Pro or Pro Tools, you will encounter AIFF. Most casual listeners never see an AIFF file because music streaming services (Spotify, Apple Music, YouTube Music) and phones use smaller, compressed formats.

How AIFF differs from MP3, AAC, and WAV

The easiest comparison is to think of AIFF as the professional version of MP3. An MP3 file is compressed — the software analyzes the sound and removes frequencies that human ears rarely notice, cutting the file size dramatically. An AIFF file keeps the entire original recording intact. A five-minute song as AIFF might be 50 MB; the same song as MP3 might be 5 MB.

WAV is nearly identical to AIFF in quality and file size — both are uncompressed and lossless. The main difference is that WAV was developed by Microsoft and IBM, while AIFF came from Apple. They work the same way and sound the same; WAV is simply more common on Windows computers, and AIFF is more common in professional audio work. AAC (Advanced Audio Codec) is Apple's compressed format, similar to MP3 but slightly better quality at the same file size. It is the format iTunes and Apple Music use.

There is also a variant called AIFF-C (AIFF Compressed), which does compress the audio, but it is rarely used because MP3 and AAC do the same job better and are more widely supported.

Playing AIFF files on your devices

On a Mac, AIFF files will play in iTunes, Music, or QuickTime without any extra software — Apple built support for its own format into the operating system. On Windows, the built-in media player (Windows Media Player) may not recognize AIFF files. You will need a third-party program like VLC Media Player (free, available for Windows, Mac, and Linux) or Foobar2000 (free, Windows only) to play them.

On phones and tablets, support is limited. iPhones and iPads can technically handle AIFF files, but the Music app does not display them in your library the way it does MP3 or AAC files. Android phones do not support AIFF natively at all. If someone sends you an AIFF file and you want to listen on your phone, the simplest solution is to convert it to MP3 or AAC first.

Converting AIFF to other formats

If you have an AIFF file and need to use it somewhere that does not support AIFF, you can convert it to MP3, AAC, WAV, or another format. On a Mac, you can right-click the file in Finder, select "Open With," choose Music, then use the File menu to convert it. On Windows, VLC Media Player can convert files — open the file, go to Media menu, select "Convert," choose your output format, and save.

There are also free online converters (search "AIFF to MP3 converter"), though uploading audio files to a website means the file travels over the internet and is stored on someone else's server. For privacy or security reasons, converting on your own computer is safer. The conversion process takes only a few seconds and produces a file that will play on any device.

When you might receive an AIFF file

If you are a musician, audio engineer, or work in music production, you will receive AIFF files regularly from collaborators, studios, or software. If you download royalty-free music from professional audio libraries, some tracks are offered in AIFF format alongside MP3 versions. If someone in the music industry sends you a recording, it is often AIFF.

If you are not involved in music production and someone sends you an AIFF file, it is usually because they did not realize you might not be able to play it easily. A quick message asking them to send it as MP3 instead solves the problem. Most people who work with audio understand that AIFF is not universal and can convert it for you in seconds.

Storage and file size considerations

AIFF files are large. A typical song in AIFF format is 40 to 60 megabytes, while the same song as MP3 is 4 to 6 megabytes. If you are storing hundreds of songs or sharing files over the internet, AIFF becomes impractical. Professional studios and music producers accept this trade-off because they need the quality for editing and mixing. Once a song is finished and ready to release, it is converted to MP3, AAC, or another compressed format for distribution.

If you are working with AIFF files regularly, you will need adequate storage space on your computer or external hard drive. A single album of ten songs in AIFF format can easily take up 500 megabytes or more. For comparison, the same album as MP3 files might use only 50 megabytes.

Frequently Asked Questions

Can I play an AIFF file on my iPhone?

iPhones technically support AIFF, but the Music app does not show AIFF files in your library. The easiest solution is to convert the file to AAC or MP3 first using a computer, then transfer it to your phone. If you need to play AIFF on your iPhone, third-party music apps like Infuse or Pacemaker may work, but they are not may provide to support every AIFF file.

Is AIFF better quality than MP3?

AIFF is lossless, meaning it preserves every detail of the original recording. MP3 is compressed and removes some sound information. In theory, AIFF sounds better, but most people cannot hear the difference when listening casually. Professional audio engineers and musicians can detect the difference during editing and mixing, which is why they use AIFF for production work.

Why would someone send me an AIFF file instead of MP3?

Usually because they are a musician, audio engineer, or work in music production and assume you can play AIFF files. Sometimes they want to preserve the highest quality for a specific purpose, like if you are going to edit the audio further. If you cannot play it, ask them to send an MP3 instead — most people in the audio industry can convert it in seconds.

Do I need special software to open an AIFF file?

On a Mac, no — iTunes and Music play AIFF natively. On Windows, you need a free program like VLC Media Player. On phones, AIFF support is limited, and converting to MP3 or AAC is usually the simplest option.

Can I convert AIFF to MP3 without losing quality?

Converting AIFF to MP3 will reduce file size, but you will lose some sound information because MP3 is a compressed format. The quality loss is usually not noticeable to casual listeners, but it is a permanent loss. If you might need the original quality later, keep the AIFF file and make the MP3 copy separately.