1. Movavi Video Converter

Why I picked it
I lean on it first because it reliably handles large files, supports batch mode, and feels polished in day-to-day use.
Movavi Video Converter makes pulling MP3 audio from MKV videos straightforward. I use it to batch-convert concert recordings and podcasts into lightweight MP3 files. The interface is clean: drop in files, pick MP3, and start the job. You can trim clips, cut silence, or tweak the audio bitrate before conversion, so every track comes out the way you want.
Recent updates strengthened audio work. The AI upscaling engine now improves sound clarity while preserving natural tone, useful for noisy live recordings. The SuperSpeed mode still impresses – large MKV files convert to MP3 in minutes without re-encoding when possible. Hardware acceleration taps modern GPUs for extra speed.
Movavi also added quick fixes for audio sync issues and smoother batch processing in version 24.x. These changes make MKV-to-MP3 extraction faster and more reliable on both Windows and macOS.