An AIFF file stores audio in uncompressed form, the way a WAV file does on Windows

AIFF stands for Audio Interchange File Format. It is a container that holds sound recordings without shrinking them down — the file stays large because nothing has been removed or squeezed. If you have ever worked with music production software, older Apple devices, or professional audio equipment, you have probably seen the .aiff extension on a file.

The key difference between AIFF and formats like MP3 or AAC is that AIFF keeps all the original audio data intact. An MP3 file removes parts of the sound that human ears typically cannot detect, making the file much smaller. An AIFF file does not do this. What goes in is what comes out, which is why recording studios and musicians often use AIFF when they need the highest quality.

AIFF was created by Apple in the 1980s as a standard way to store audio on computers. It became common in music production and remains the default format in many professional audio programs. You will see it most often if you work with GarageBand, Logic Pro, or other music software on a Mac, or if you read audio from certain music production websites.

Key Takeaways

  • AIFF files store audio without compression, so they are much larger than MP3 or AAC files but preserve every detail of the original recording.
  • AIFF was developed by Apple and is the standard format in music production software like GarageBand and Logic Pro.
  • Most everyday devices and music players do not recognize AIFF files, so you will need to convert them to MP3 or AAC before sharing or playing them on phones and tablets.
  • If you see a .aiff file, it almost always came from music software or professional audio work rather than from downloading music online.

Why AIFF files are so large

An AIFF file is large because it stores the complete audio waveform — every tiny fluctuation in sound pressure that the microphone or instrument captured. Imagine recording a voice: the computer measures the sound thousands of times per second and writes down each measurement as a number. AIFF keeps all those numbers.

An MP3 file, by contrast, analyzes those numbers and throws away the ones that matter least to human hearing. A person listening to an MP3 usually cannot hear the difference, but the file becomes five to ten times smaller. AIFF makes no such trade-off. A three-minute song in AIFF format might be 40 to 50 megabytes, while the same song as an MP3 might be 3 to 5 megabytes.

This is why AIFF is used in recording studios and music production: the engineer needs to hear and edit every part of the sound. But it is also why AIFF files are rarely used for everyday listening. They take up too much space on a phone or music player, and most devices do not know how to play them anyway.

Where you will encounter AIFF files

If you use music production software on a Mac, you will see AIFF files regularly. GarageBand, Logic Pro, and other professional audio programs often save projects and exported audio in AIFF format by default. When you finish recording a song or podcast in one of these programs, the software may offer to save it as AIFF.

You might also encounter AIFF if you read audio from certain music production websites, royalty-free music libraries, or if someone sends you an audio file from a recording studio. Some online music services that cater to producers and musicians offer downloads in AIFF format alongside MP3 and other options.

On Windows computers, AIFF is less common. Windows uses WAV as its equivalent uncompressed audio format. If you receive an AIFF file on a Windows machine, your computer will not recognize it without additional software, though many media players can be updated to handle it.

Converting AIFF to a format your devices can play

If you have an AIFF file and want to listen to it on a phone, tablet, or standard music player, you will need to convert it to a format those devices understand — usually MP3 or AAC. This process is called encoding, and it removes some audio data to make the file smaller, but the difference is usually not noticeable to casual listeners.

On a Mac, the simplest method is to open the AIFF file in iTunes (or Music, in newer versions), then use the File menu to convert it. Select the AIFF file, go to File > Convert, and choose the format you want. The program will create a new file in that format while leaving the original AIFF untouched.

On Windows, you can use free software like VLC Media Player or Audacity. VLC can convert files through its Media menu. Audacity is a free audio editor that can open AIFF files and export them as MP3 or WAV. Both programs are free to read and use.

Online conversion websites also exist, though uploading large audio files to the internet takes time and raises privacy questions. For files you plan to convert more than once, downloading free software to your computer is usually faster and safer.

AIFF versus WAV and other audio formats

AIFF and WAV are nearly identical. Both store uncompressed audio, both are large, and both preserve the original recording in full detail. The main difference is that AIFF was created by Apple and WAV was created by Microsoft. On a Mac, AIFF is the standard. On Windows, WAV is the standard. A professional audio engineer might prefer one or the other depending on what software they use, but for practical purposes they serve the same role.

MP3 and AAC are compressed formats — they remove audio data to shrink file size. They are much smaller than AIFF or WAV, which is why they became the standard for music players and phones. The trade-off is that some audio detail is lost, though most people cannot hear the difference in everyday listening.

FLAC is a newer format that compresses audio without losing any data — it is like a ZIP file for sound. FLAC files are smaller than AIFF but larger than MP3, and they preserve perfect audio quality. Some music streaming services and high-end audio equipment support FLAC, but it is less common than MP3 or AAC.

When you should keep a file in AIFF format

Keep a file in AIFF format if you are still editing or producing it. If you recorded a podcast, song, or voiceover and plan to make changes — adjusting volume, adding effects, cutting sections — work with the AIFF version. The uncompressed data gives you more flexibility and better sound quality as you edit.

If you are archiving audio for long-term storage and want the highest possible quality, AIFF is a good choice. Museums, libraries, and broadcasters often store master recordings in uncompressed formats like AIFF or WAV so that future generations can access the original sound without any loss.

Once you are finished editing and ready to share or publish, convert to MP3 or AAC. This makes the file small enough to email, upload, or play on any device. You can always keep the original AIFF file as a backup in case you need to edit again later.

Frequently Asked Questions

Can I play an AIFF file on my phone or tablet?

Most phones and tablets do not recognize AIFF files natively. iPhones and iPads can sometimes play them through certain apps, but the easiest solution is to convert the AIFF to MP3 or AAC first using a computer, then transfer the converted file to your device.

Is AIFF the same as WAV?

AIFF and WAV are functionally identical — both store uncompressed audio with no loss of quality. AIFF is Apple's standard and WAV is Microsoft's standard. They serve the same purpose in music production, and you can convert between them without losing any audio data.

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

They are likely a musician, audio engineer, or producer who wants you to have the highest quality version for editing or further work. If you only need to listen to it, you can ask them for an MP3 instead, or convert the AIFF yourself using free software.

Does converting AIFF to MP3 ruin the quality?

The conversion removes some audio data, but most people cannot hear the difference in casual listening. If you are doing professional audio work, keep the AIFF original and use the MP3 only for sharing or playback on portable devices.

What is the file extension for AIFF?

AIFF files use the .aiff extension. You may also see .aif, which is a shortened version of the same format. Both refer to the same type of file and can be opened by the same software.