.aif File Extension
.aif file is, which apps open AIF audio, how Poly supports it, and when WAV or FLAC may work better. File extension details for .aif
Partial Support| File type | Audio Interchange File Format audio |
|---|---|
| MIME type | |
| Encoding | Binary IFF container, usually uncompressed PCM audio |
| Operating systems | Windows, macOS, Linux |
| Opens with | Apple Logic Pro, Adobe Audition, VLC, FFmpeg |
| Poly support | Partial. Poly can process AIF audio identified from its contents or supplied media type, but does not infer AIFF from the .aif suffix alone. |
| Indexed by Poly | Yes, when recognized as audio. Poly indexes transcripts, audio similarity, filenames, and supported tags. |
| Preview in Poly | Partial. AIF opens in the audio player when recognized, but playback depends on browser support for the contained encoding. |
| Poly agent | Yes, when recognized as AIFF. The Poly agent can use a transcript or supported audio directly. |
What kind of file is a .aif?
A .aif file is usually an Audio Interchange File Format (AIFF) recording. It is the shorter sibling of .aiff, not a different audio format. AIFF is a binary, chunk-based container created by Apple and commonly carries uncompressed linear PCM audio for recording, editing, sample libraries, and interchange.1
The common MIME labels audio/x-aiff and audio/aiff are both unregistered. Neither appears in IANA's current media-type registry.2 Software therefore relies on established convention as well as content inspection.
An ordinary AIFF file starts with ASCII FORM (46 4F 52 4D in hexadecimal), followed by a size field, then AIFF at byte offset 8. Checking only FORM is insufficient because other IFF formats share that marker. AIFC in the form-type field instead identifies AIFF-C, which can contain compressed or alternative sample encodings.3
.aif does not convert its container or audio. Inspect the header when a file's name and contents disagree.How do I open a .aif on my computer?
- On macOS, use Logic Pro or another AIFF-capable audio editor. Logic Pro supports AIFF at common professional bit depths and sample rates up to 192 kHz.4
- On Windows or macOS, Adobe Audition opens
.aif,.aiff, and.aifc, including uncompressed files with as many as 32 channels.5 - On Windows, macOS, or Linux, VLC is convenient for playback, while FFmpeg is useful for inspection and conversion.
Browser playback is less predictable than MP3 or AAC playback. Support depends on the browser, operating system, and encoding inside the container, so use a desktop audio application if a web player stays silent.
Poly support for .aif
Poly can process an AIF file when its contents identify it as AIFF or its media type is supplied. It can extract duration and available tags, use embedded cover art, create audio-similarity segments, and transcribe intelligible speech. Those results make the recording searchable and available to the Poly agent.
The .aif suffix is not currently part of Poly's filename-only AIFF mapping. A file known only by this extension can therefore miss format-aware processing. Preview also depends on the browser being able to decode the original audio. For the most reliable current behavior, use the .aiff spelling or provide an accurate AIFF media type.
History of .aif
Apple published AIFF version 1.3 on January 4, 1989, adapting Electronic Arts' IFF chunk structure for sampled sound.1 The Library of Congress identifies .aif as the most widely used extension for the format, while .aiff is also common.1
AIFF-C followed in 1991. Its expanded common chunk added a compression-type field, although an AIFF-C file can still hold uncompressed PCM.3 That distinction is stored in the file header, not reliably communicated by the .aif suffix.
Working with .aif and alternatives
Uncompressed PCM size is approximately sample rate x bytes per sample x channels x duration. One minute of stereo 44.1 kHz, 16-bit audio uses about 10.6 MB before small container overhead. Higher sample rates or bit depths increase size proportionally.
Choose an alternative based on the next step:
- WAV for broad uncompressed interchange.
- FLAC for lossless storage with smaller files.
- AAC, MP3, or Opus for compact distribution.
AIFF and WAV can preserve identical PCM samples despite using different containers. FLAC can also preserve decoded PCM losslessly. Match the source sample rate and bit depth during conversion when you want to avoid resampling or precision loss. A lossy export cannot be restored by converting it back to .aif.
Footnotes
- Library of Congress. AIFF (Audio Interchange File Format). ↩ ↩2 ↩3
- Internet Assigned Numbers Authority. Media Types Registry. ↩
- Apple Computer, Inc. Audio Interchange File Format AIFF-C Specification, archived by McGill University. ↩ ↩2
- Apple Support. Media and File Formats in Logic Pro. ↩
- Adobe. Supported Import Formats in Audition. ↩