Convert MP3 to AIFF — Free Online Converter

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.