Convert MPEG Audio Layer 3 (.mp3) to Audio Interchange File Format (.aiff) online for free. Fast, secure audio conversion with no watermarks or registration.
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AIFF (Audio Interchange File Format) is Apple's uncompressed audio standard, created in 1988 based on Electronic Arts' IFF format. It stores raw PCM samples without any compression, making it the native working format for Logic Pro, GarageBand, Final Cut Pro, and professional Mac audio workflows. Converting MP3 to AIFF decodes the lossy MP3 compression and produces an uncompressed PCM file that professional audio applications can edit without any additional decoding overhead.
MP3 was never designed for editing — the format uses psychoacoustic compression that removes audio data permanently, and every re-encode introduces further artifacts. When you bring MP3 files into a production environment, the first step should always be converting to an uncompressed format like AIFF or WAV. This eliminates the decode-encode cycle that would otherwise degrade quality each time you export or process the audio.
Professional audio editing on macOS revolves around uncompressed formats. Logic Pro, GarageBand, Pro Tools, Ableton Live (on Mac), and Final Cut Pro all perform best with AIFF files because they can read the raw PCM samples directly without running a decoder. This reduces CPU usage during playback, enables sample-accurate editing, and ensures that every export produces consistent results regardless of how many times the file is opened and saved.
AIFF is also the standard format for sound effects libraries, broadcast audio, and CD mastering on Apple platforms. If you are incorporating MP3 source material into a podcast, video soundtrack, music production, or broadcast workflow on a Mac, converting to AIFF first gives you a stable working copy that does not degrade with repeated processing. The decoded MP3 audio is preserved at CD quality (16-bit, 44.1 kHz) or higher resolution if desired.
FFmpeg decodes the MPEG Audio Layer 3 bitstream (typically 44.1 kHz, 128-320 kbps) to raw PCM samples, then wraps them in the AIFF container as signed 16-bit big-endian PCM at the original sample rate. The output is approximately 10.1 MB per minute for 44.1 kHz stereo (1,411 kbps). Converting a 320 kbps MP3 to AIFF increases file size by roughly 4.4x, while a 128 kbps MP3 becomes approximately 11x larger.
The AIFF output is an exact representation of the decoded MP3 audio — no additional quality loss occurs during this conversion. However, AIFF cannot restore frequencies or detail that MP3 compression removed from the original recording. A 128 kbps MP3 converted to AIFF will sound identical to the MP3 source, just in a larger uncompressed container. The benefit is that subsequent edits and processing do not introduce further lossy compression artifacts.
| Device | MP3 | AIFF |
|---|---|---|
| Windows PC | Native | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Native | Partial |
| Linux | Partial | Partial |
| Web Browser | Native |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
Converting MP3 to AIFF is the standard first step when bringing MP3 audio into professional Mac workflows. The uncompressed AIFF output is ready for editing in Logic Pro, GarageBand, and Final Cut Pro without any decode overhead or generational quality loss from repeated processing.
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Jakýkoli prohlížeč, jakékoli zařízení
| No |
| Vlastnost | MP3 | AIFF |
|---|---|---|
| Celý název | MPEG Audio Layer III | Audio Interchange File Format |
| Přípona | .mp3 | .aiff |
| Nejlepší pro | Universal compatibility | Lossless quality |