MKV to OPUS Converter

Extract Opus Audio from MKV Online

Pull the audio track out of an MKV video and save it as a standalone Opus file. Opus is the open IETF codec (RFC 6716) behind Discord, WhatsApp, and WebRTC voice — it stays clear at low bitrates, so a podcast clip or a stretch of dialogue lands at a fraction of the size you'd get from MP3. The video is discarded and the audio is re-encoded to Opus; pick the bitrate and you control the size-versus-fidelity trade.

How to Convert MKV to Opus

1. Upload Your MKV File: Drag and drop your file onto the page or click "+ Add Files" to browse. Add several MKV files to extract them in one batch.
2. Set the Quality Preset: Open Advanced Options and choose a Quality Preset (Highest down to Lowest) or switch to Constant, Variable, or Custom Bitrate to name an exact kbps target — 96 kbps is roughly transparent for speech, 128 kbps for music.
3. Trim or Downmix (Optional): Use Trim to keep only a start-to-duration slice, set Audio Channel to Mono to halve the size of voice recordings, or lower the Audio Sample Rate.
4. Convert and Download: Click "Convert" and download your .opus file. No sign-up, no watermark.

Opus Bitrate Guide for Extracted Audio

Frequently Asked Questions

Does extracting Opus from MKV re-encode the audio?

Yes, in almost every case. This tool decodes the audio track inside the MKV — often AAC, AC-3, DTS, or FLAC — and re-encodes it to Opus, so a lossy source goes through one more generation of lossy compression. The loss is minor at 128 kbps and up, but it is not a lossless copy of the original track. If your MKV already carries an Opus track and you simply want it in a .opus file, expect a re-encode here rather than a raw remux.

What bitrate should I pick for voice versus music?

For speech, Opus is efficient enough that 24–48 kbps in Mono sounds clean and keeps files tiny. For music, 96 kbps already rivals MP3 at 128 kbps, and 128 kbps is widely rated as transparent — indistinguishable from the source in normal listening. In our testing, a 60-minute dialogue track extracted at 32 kbps Mono came out near 14 MB, versus roughly 28 MB for the same track at 64 kbps stereo.

Will my Opus file play everywhere?

Not quite everywhere. Opus has native support in Chrome, Firefox, Edge, Android, and Safari on iOS 18.4+ — about 96% of browsers overall — plus apps like VLC and Discord. The weak spots are older car stereos, legacy phones, some smart TVs, and Windows 8.1 and earlier (which need a decoder such as LAV Filters). If you need maximum playback compatibility, convert MKV to MP3 instead.

Why extract Opus instead of MP3?

Opus delivers better quality per kilobyte at every bitrate, with the biggest lead at low bitrates where MP3 struggles. That makes it ideal when you care about small files — voice notes, podcast archives, or clips sized to drop straight into Discord or a chat app. Choose MP3 only when the target device or app can't decode Opus.

How large will the extracted file be?

It depends almost entirely on the bitrate you pick, not the size of the MKV. As a rough guide, one minute of audio is about (bitrate in kbps ÷ 8) kilobytes per second — so a 60-minute file at 64 kbps is near 28 MB, and the same length at 32 kbps Mono is near 14 MB. Lowering the bitrate, switching to Mono, or trimming to a shorter slice all shrink the result.

Is my file kept private?

Your MKV is uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion. There is no sign-up, no watermark, and files are never shared or made public.