Convert MKV to MP3 — Extract Audio from Movies, Anime, and Media Collections

The converter extracts the default (primary) audio track from the MKV container. In most anime encodes, the default track is set to Japanese, but it depends on how the file was muxed. If you need the secondary track instead — say the English dub — you would need to use a tool like MKVToolNix to set it as the default track first, then convert MKV to MP3 here.

Yes. The file size does not matter for the conversion itself because the tool only reads the audio stream, not the video. A 10 GB Blu-ray remux might have an audio track that is only 300-500 MB, and that is all the converter needs to process. The main requirement is that your device has enough free memory. On a desktop or laptop, 10 GB MKV files convert to MP3 without any issues.

Yes. MP3 is a stereo format (or mono), so multi-channel audio like AC3 5.1 or DTS will be downmixed to two channels during the conversion. The surround channels get folded into the stereo mix. For most listening scenarios — headphones, phone speakers, car stereos — this sounds perfectly natural. You will not miss the rear channels unless you were planning to hook up a full surround sound system.

This is usually a dynamic range issue. Movie and anime audio tracks are mixed for cinema or home theater, meaning they have a wide dynamic range — quiet parts are very quiet and loud parts are very loud. When you extract that as MP3 and listen through regular speakers or earbuds, the overall volume can feel lower than music you are used to. Boosting the volume on your player or running the MP3 through a loudness normalizer will fix this.

Only if the commentary track is set as the default audio stream in the MKV file. The converter extracts the primary audio track automatically. If the commentary is a secondary track, you would need to remux the MKV with MKVToolNix and set the commentary as the default track before converting MKV to MP3 here. It is a quick step — MKVToolNix lets you reorder tracks without re-encoding anything.

Absolutely. HandBrake is one of the most common sources of MKV files, and the audio it encodes — usually AAC or passthrough AC3 — converts to MP3 perfectly. It does not matter which HandBrake preset you used or which version created the file. If HandBrake made it, this converter can extract the audio from it.

Go with MP3 when you need maximum compatibility. MP3 plays on literally every device and audio app ever made. Choose AAC if you are staying within the Apple ecosystem (iPhone, iPad, Mac, iTunes) and want slightly better audio quality at the same file size. For most people converting MKV to audio, MP3 is the safer and simpler choice because you will never run into a device that cannot play it.

No. MP3 does not support chapter markers. When you convert MKV to MP3, the chapter information is discarded along with the video and subtitles. You get a single continuous audio file. If you need the audio split at chapter points, you would need to split the MKV into separate files first (one per chapter) and then convert each one to MP3 individually.

The converter extracts audio from the entire MKV file — it does not do selective time-range extraction. So yes, you will get the full episode audio including the opening and ending. To isolate just the OP or ED, convert the full MKV to MP3 first, then use an audio trimmer to cut out the segment you want. Openings are typically the first 90 seconds and endings are the last 90 seconds.

Technically yes, because FLAC is lossless and MP3 is lossy. In practice, at 320 kbps the difference is extremely difficult to hear. Most people cannot tell FLAC from a high-bitrate MP3 in a blind listening test. If you want to keep the audio lossless, you could convert the MKV to FLAC or WAV instead using the audio converter tool on this site. But for everyday listening on headphones or speakers, MP3 at 320 kbps from a FLAC source sounds great.