File Extension Guide🎵 What is an AIFF File?
An AIFF file, ending in .aiff or .aif, is an audio file that stores sound at full quality with no compression at all. The name stands for Audio Interchange File Format, and Apple created it back in 1988.
Think of an AIFF as a complete, unabridged recording. Rather than shrinking the sound to save room the way an MP3 does, it keeps every tiny sample of the audio exactly as captured. That gives you the highest possible fidelity, a faithful copy of the original waveform, at the price of a large file. A single minute of stereo sound in this form takes up roughly ten megabytes, many times what the same minute would need as an MP3.
Apple built the format for the Macintosh, basing it on an earlier design from Electronic Arts called IFF, and it went on to become the go-to audio format across Apple's software. If you have ever exported a track from GarageBand or Logic Pro and landed on a hefty .aiff, that is this format doing its job of preserving the recording in full. Because it holds sound so faithfully, AIFF has long been a favourite for recording, editing and mastering, where keeping the original quality intact matters more than saving space.
📌 AIFF File Quick Facts
| Full name | Audio Interchange File Format |
| Developed by | Apple, in 1988 |
| Based on | Electronic Arts' IFF format |
| Audio inside | Uncompressed PCM, lossless |
| File size | Large, about 10 MB per minute of stereo |
| Extensions | .aiff, .aif, .aifc |
| Counterpart | WAV, its Windows equivalent |
💾 Why AIFF Files Are Large
The size of an AIFF is not a flaw, it is the whole point, and it comes straight from how the format stores sound.
Inside an AIFF the audio is held as PCM, short for pulse-code modulation, which is simply the raw digital form of a sound wave. Recording it this way means writing down thousands of individual measurements of the wave every second and keeping all of them. Nothing is packed down, estimated or thrown out, so what you get back on playback is bit-for-bit what was recorded. That fullness is what makes the format lossless and pristine, and also what makes it heavy.
The contrast with a format like MP3 is stark. An MP3 uses clever tricks to discard the parts of a sound a listener is least likely to notice, which is how it fits a song into a few megabytes. AIFF refuses to make that bargain, so a track can run to tens of megabytes. There are middle-ground options too, such as Apple Lossless (ALAC) and FLAC, which compress the audio without losing any quality and land at roughly half the size, but a plain AIFF stays fully uncompressed by design. For studio work that trade of space for total fidelity is exactly what people want.
🎚️ Sample Rate and Bit Depth
Not every AIFF is the same size or quality, because two settings chosen when the audio is recorded decide how much detail the file holds, and those are its sample rate and its bit depth.
The sample rate counts how often the sound wave gets sampled each second, expressed in kilohertz. A rate of 44.1 kHz, the CD standard, captures the full range of human hearing, while higher rates such as 48, 96 or even 192 kHz record ever finer detail. The bit depth is how precisely each of those measurements is stored, usually 16 bits for CD-quality sound or 24 bits for professional work, and a larger number of bits widens the range the file can hold from its softest to its fullest sound. Push either number up and you gain fidelity, but the file grows to match.
That growth is easy to see in real numbers. A four-minute stereo track at CD settings of 16-bit and 44.1 kHz comes to around 42 megabytes, the same as it would as a WAV. Step up to the professional standard of 24-bit and 48 kHz and the same four minutes runs to roughly 83 megabytes, and at a high-resolution 24-bit and 96 kHz it reaches about 166 megabytes. Which to choose depends on the work, with CD settings fine for music delivery, 24-bit and 48 kHz common for video and studio recording, and the highest rates saved for archiving or detailed editing. A useful reference point is that CD mastering asks for 44.1 kHz while broadcast and video usually want 48 kHz, so matching the target medium avoids an unnecessary conversion later.
⚖️ AIFF vs WAV
The format people most often line up against AIFF is WAV, and for good reason, since the two are near twins that grew up on opposite sides of the computing world.
Both store the same kind of uncompressed PCM audio, so in sound quality they are effectively identical, and a file converted from one to the other loses nothing. The real differences are under the hood. AIFF came from Apple and organises its data in the IFF chunk structure, while WAV came from Microsoft and IBM and uses a related structure called RIFF. There is even a difference in the order the bytes are written, with AIFF using big-endian and WAV using little-endian, a detail that rarely matters to anyone but the software reading the file. The practical split is simply origin, AIFF is the Apple-leaning format that Mac tools reach for, and WAV is the Windows-leaning one.
In day-to-day use the choice hardly matters, because almost every media player and audio editor handles both. You might keep audio as AIFF when you work mostly on a Mac and in Apple software, and lean toward WAV when you collaborate with Windows users or send files to a wider set of programs. Either way the audio inside is the same, which is why converting between the two is quick and safe.
| Aspect | AIFF | WAV |
|---|---|---|
| Origin | Apple, 1988 | Microsoft and IBM, 1991 |
| Audio | Uncompressed PCM | Uncompressed PCM |
| Structure | IFF chunks, big-endian | RIFF chunks, little-endian |
| Home platform | macOS | Windows |
| Sound quality | ✓ Full, lossless | ✓ Full, lossless |
🔤 AIF and AIFC Explained
You will sometimes come across the endings .aif and .aifc alongside .aiff, and it helps to know how they relate, because two of them are the same thing and one is a little different.
The .aif ending is just the older, three-letter spelling of .aiff, a leftover from early systems that limited file endings to three characters. A .aif and a .aiff are the same format holding the same uncompressed audio, so you can treat them as interchangeable. The .aifc ending marks the one genuine variation, known as AIFF-C or AIFC. It uses the same overall container but adds the ability to store compressed audio through various codecs, which a plain AIFF never does. Depending on the codec chosen, an .aifc file may actually be smaller and, in some cases, no longer perfectly lossless.
🧩 Inside an AIFF File and Its Metadata
An AIFF is not just a wall of sound data, it is organised into labelled sections called chunks, and understanding them explains both how the file works and why converting it can sometimes lose information.
Every AIFF opens with a top-level wrapper, the FORM chunk, that holds everything else. Within it, a COMM chunk records the technical details of the audio such as its sample rate, bit depth and number of channels, while an SSND chunk carries the actual sound samples themselves. That clean split of description from data is inherited from the old Electronic Arts IFF design the format is built on. Beyond those essentials, an AIFF can carry extra chunks that many people never realise are there.
Those extras are where the format gets interesting for musicians. An INST chunk can store the musical note of a sample along with its playable range and tuning, and MARK chunks can hold loop points, all of which hardware samplers and music software rely on to play a sound correctly. AIFF can also keep descriptive tags such as a name, author and comments, and even artwork or lyrics in some tools. The catch is that these details live in AIFF's own chunks, so converting a file to another format can quietly drop them. Turning a sample library file into WAV, for instance, keeps the audio perfectly but may strip the loop points a sampler depends on, which is worth remembering before you convert a working file.
▶️ How to Open an AIFF File
Playing an AIFF is usually as simple as double-clicking it, because the ability to play it ships with most systems already and lives in plenty of free programs besides.
On a Mac the format is right at home, opening in the Music app, QuickTime Player, GarageBand and other Apple software without any setup. On Windows it plays in Windows Media Player and, through the same app family, wherever Apple's Music software is installed. Across both platforms the free and widely trusted VLC media player opens AIFF files happily, as does the audio editor Audacity if you want to look at or work with the waveform rather than just listen. For a quick play without installing anything, our online File Viewer opens an AIFF straight in your browser.
📱 Where AIFF Works and Where It Doesn't
AIFF is thoroughly at home in the Apple and professional audio worlds, but it is worth being honest about the places it struggles, so you know when to reach for something else.
On the friendly side, every Mac plays AIFF out of the box, professional editors such as Logic Pro and Pro Tools handle it as a matter of course, and the free VLC player opens it on any system. Where things get patchy is outside that circle. On Windows the format may lean on extra components to play in some apps, plenty of Android phones cannot play AIFF at all, car stereos almost never accept it, and support in web browsers is hit and miss. Its sheer size also makes it a poor fit for email or web use. For anything aimed at a general audience or the open web, a compressed format like MP3 or AAC travels far more reliably.
One specific playback snag is worth naming. A file saved as the AIFF-C variant with a codec called sowt is identical in quality to a normal AIFF and converts back and forth without loss, yet an older program may refuse to open it, ask to convert it first, or play it as harsh static. If you meet that, the cure is simply to convert the file to a plain AIFF or to WAV, after which it behaves normally everywhere.
🔄 Converting AIFF Files
Because an AIFF is large, converting it is a common next step, whether to save room or to make the audio play nicely somewhere that prefers another format.
Where you are heading decides what to pick. Turning an AIFF into an MP3 or AAC shrinks it dramatically, easily to a tenth of the size, with a drop in quality most people never hear, which suits phones, streaming and sharing. If you want to keep every bit of quality but still save space, Apple Lossless or FLAC compress the audio with no loss at all and come out roughly half the size. And when you simply need the same uncompressed audio in the Windows-friendly form, converting to WAV does that with nothing lost, since the two are equivalent. Our File Converter handles these targets in the browser, so you can move an AIFF to MP3, WAV or a lossless format without installing software.
One thing worth keeping in mind is to hold on to your original AIFF if it is a master recording. Converting to a lossy format like MP3 cannot be undone, so keeping the full-quality file means you can always make a fresh copy in whatever format you need later. Many people work this way on purpose, treating the AIFF as the untouchable master and generating smaller MP3 or AAC versions from it for everyday listening as the need arises.
❓ Frequently Asked Questions
An AIFF file, with the .aiff or .aif extension, is an audio file that stores sound uncompressed, at full quality with nothing discarded. The name stands for Audio Interchange File Format, and Apple developed it in 1988 for the Macintosh. Because it keeps every sample of the recording rather than shrinking it, the sound is lossless and pristine, but the files are large, around ten megabytes for a minute of stereo. It is the Apple world's counterpart to the WAV format used on Windows, and it is popular for recording, editing and mastering where quality matters most.
On most systems you can simply double-click it. A Mac plays AIFF in the Music app, QuickTime Player and GarageBand with no setup, and Windows opens it in Windows Media Player. The free VLC media player handles AIFF on any platform, and the editor Audacity opens one if you want to work with the waveform. You can also play an AIFF in your browser without installing anything through our online File Viewer. Should one stay stubbornly shut in an older program, the likely cause is the compressed AIFF-C variant, which turning into a plain AIFF or WAV usually resolves.
Very little in terms of the sound. Both store the same uncompressed PCM audio, so they are equal in quality and a file converted from one to the other loses nothing. The differences are technical, in how the data is arranged, since AIFF comes from Apple and uses the IFF chunk structure while WAV comes from Microsoft and uses RIFF, and the two even write their bytes in opposite order. In practice the split is about platform, AIFF being the Mac-leaning format and WAV the Windows one. Since nearly every player and editor supports both, you can pick whichever suits the software you use.
Because they are uncompressed. An AIFF stores the audio as raw PCM data, writing down thousands of measurements of the sound wave every second and keeping all of them, with nothing packed away or thrown out. That gives a perfect copy of the recording but takes real space, roughly ten megabytes for a minute of stereo, far more than an MP3 that reaches a few megabytes by discarding detail. When the size gets in the way you might move it into a lossy format such as MP3 for a big saving, or to Apple Lossless or FLAC to trim the size with the quality left fully intact.
Better for quality, not for size, so it depends on what you need. AIFF keeps the recording completely intact, which makes it the right choice for recording, editing and mastering where you do not want to lose anything. MP3 throws away detail to become far smaller, which most listeners cannot hear and which makes it ideal for phones, streaming and everyday listening. A good habit is to keep a master as AIFF and make MP3 copies from it for casual use, since you can always create a fresh MP3 from the AIFF but cannot rebuild the full quality once it is gone.
They are close relatives of .aiff. The .aif ending is simply the older three-letter spelling of .aiff, from a time when systems limited file endings to three characters, and it holds the exact same uncompressed audio, so the two are interchangeable. The .aifc ending is the one real variation, standing for AIFF-C, which uses the same container but can store compressed audio through various codecs. That means an .aifc file may be smaller than a plain AIFF and, depending on the codec, may not be perfectly lossless, whereas standard .aiff and .aif are always uncompressed.
It depends on the job. For CD-quality music, 16-bit at 44.1 kHz is the standard and sounds excellent. For recording, video and studio work, 24-bit at 48 kHz is the common professional choice, and 24-bit at 96 kHz suits archiving or detailed editing where you want maximum headroom. Higher numbers capture more detail and a wider dynamic range but make the file bigger, so a four-minute track jumps from about 42 megabytes at CD settings to roughly 166 megabytes at 24-bit and 96 kHz. Pick the lowest setting that meets your quality needs, since going higher mainly adds size.
Yes. Alongside the audio, an AIFF is organised into labelled sections, and some of those can hold extra information. It can store descriptive tags such as a name, author and comments, and for musicians it can carry an instrument's note, playable range and loop points that hardware samplers rely on. The important thing to know is that this data lives in AIFF's own sections, so converting the file to another format can quietly drop it. The audio always survives a conversion, but embedded loop points or instrument details may not, which is why keeping the original AIFF matters when that information is being used.
The usual reason is that the file is an AIFF-C variant using a codec called sowt. It is identical in quality to a normal AIFF and can be converted back and forth without any loss, but some older programs do not recognise it, so they refuse to open it, ask to convert it first, or play it as harsh static. The fix is straightforward, which is to convert the file to a plain AIFF or to WAV. Once you do, it plays normally in any program. If a whole batch of files behaves this way, they were likely all exported in the same AIFF-C form.
Often not. AIFF is well supported on Apple devices, professional audio software and the VLC player, but outside that circle it gets patchy. Many Android phones cannot play AIFF on their own, car stereos almost never support it, and browser playback is inconsistent. Its large size also makes it awkward to send by email or use on the web. If you need audio that plays reliably on a phone, in a car or across the internet, converting to a compressed format such as MP3 or AAC is the dependable choice, since those are supported almost everywhere and are a fraction of the size.
For pure archiving, FLAC is usually the smarter pick. Both keep the audio perfectly, with no quality loss at all, but FLAC compresses the sound to roughly 40 to 60 percent of the uncompressed size, so a library takes far less storage while remaining a faithful copy you can decode back to the original. AIFF stays fully uncompressed, which is ideal as a working master in an Apple studio session but wasteful purely for long-term storage. A common approach is to work in AIFF and then archive to FLAC, or to Apple Lossless if you live in the Apple ecosystem, getting the space saving without giving up any fidelity.
Yes. GarageBand exports to AIFF by default when you share a song to disk, offering bit-depth choices as you do. Logic Pro has long used AIFF as a recording and export format, and although recent versions lean on other formats internally, they still import and export AIFF without any trouble. This is a big part of why you so often end up with a large .aiff after finishing a track in Apple's music tools. If you want a smaller file for sharing, you can export or convert it to MP3 or AAC afterwards while keeping the AIFF as your master.
Key Takeaways
An AIFF file is Apple's uncompressed, lossless audio format from 1988, storing raw PCM sound at full quality, which is why a minute of stereo runs to about ten megabytes.
It is the Mac counterpart to WAV, holding technically identical audio, so converting between the two is quick and loses nothing.
You can play an AIFF in most media players including VLC, and convert it to MP3 or AAC to save space, or to Apple Lossless or FLAC to shrink it while keeping full quality.