Convert MID to ALAC — Free Online Converter

MID (Standard MIDI File) encodes musical performance as a sequence of instructions — note events, velocity, timing, channel assignments, pitch bends, and control changes. MIDI files are extraordinarily compact (10-100 KB) because they contain no audio, only a recipe for producing music. The actual sound depends entirely on the synthesizer interpreting these instructions.

ALAC (Apple Lossless Audio Codec) compresses audio without losing any data — every PCM sample is perfectly preserved. Converting MID to ALAC renders the MIDI performance through a software synthesizer and saves the result as losslessly compressed audio. This gives you a space-efficient Apple-ecosystem-compatible file that preserves the full quality of the synthesis.

MIDI's dependency on external synthesizers means playback is unpredictable across devices. ALAC captures a specific rendered version with bit-perfect audio preservation while using roughly 50-60% of the space that uncompressed AIFF or WAV would require. For Apple users, ALAC integrates seamlessly with iTunes, Apple Music, iPhone, iPad, and Mac.

ALAC is the ideal format when you need lossless archival of a MIDI rendering within Apple's ecosystem. Unlike AAC, no audio data is discarded during encoding. Unlike AIFF, the file is significantly smaller. This makes ALAC the best balance of quality and efficiency for MIDI renders destined for Apple devices.