Pull the audio out of any video as a clean MP3.
Convert MP4 to MP3 with no upload, no file-size limit, and free — because your file converts on your own computer. MachineSync extracts the audio on your own machine, so even a two-hour recording becomes an MP3 without an upload, a queue, or a size cap.
An MP4 holds both picture and audio. Converting to MP3 keeps only the audio track — the podcast, lecture, or song — as a small file that plays on any device.
A long screen recording or a full concert is exactly what free web tools reject. Because the extraction runs on your own computer, file length and size don't matter.
Online converters charge for length and cap file sizes because they run on servers they pay for. MachineSync runs the extraction on your own machine, so there is nothing to meter.