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MP4 to OPUS converter

Convert MP4 to OPUS in your browser. No upload and no account: the file never leaves your device, so the only size limit is your device’s memory.

I want OPUS
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Leave both at 0 for the whole file.

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Bytes of your files sent anywhere: 0 B

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Other ways to convert MP4

Convert other formats to OPUS

Read more about the MP4 format and the OPUS format, or see every video tool and all video conversions.

Should you convert MP4 to OPUS?

Yes, when you only need the sound: a song from a music video, the audio of a lecture, or a voice recording to transcribe. The picture is left out and the soundtrack is saved as OPUS.

MP4 is the video container that plays on everything, usually holding H.264 video and AAC audio; OPUS is the most efficient audio codec in common use, especially for speech. Use Opus for speech and streaming where small size matters more than compatibility.

MP4 and OPUS compared
Property MP4 OPUS
What it is The video container that plays on everything, usually holding H.264 video and AAC audio The most efficient audio codec in common use, especially for speech
Audio inside H.264 or HEVC video with AAC audio 24–128 kbps
Plays on Every phone, browser, TV, editor, chat app and upload form Browsers, Android and chat apps; many media players, editors and forms can’t open .opus files
Best for Sharing video anywhere Voice notes, calls and streaming at low bitrates

How to convert MP4 to OPUS

  1. 01

    Add your MP4

    Drop your MP4 video onto the box, or click to choose it. It is read from your disk and stays there.

  2. 02

    Check the settings

    The output is already set to OPUS. Change the bitrate if you want to; the defaults suit most files.

  3. 03

    Save the OPUS

    Press convert and save the OPUS. Several files come back together as a ZIP.

What changes when MP4 becomes OPUS

From AAC to Opus

MP4 soundtracks are usually AAC, so saving OPUS is one more lossy step. 192 kbps suits music, 128 kbps is plenty for speech, and going above the original bitrate only makes the file bigger.

Ideal for speech

Opus sounds clear at very low bitrates, which makes it the smallest option for lectures, meetings and interviews.

Video files without sound

Screen recordings and some exported clips have no audio track at all. The file is checked as soon as you add it, and you’ll be told before converting if there’s nothing to extract.

This page is put together from our notes on each format, choosing only what is true of MP4 and OPUS, so every pairing states the same facts the same way. How these pages are made.

Why it doesn’t upload

Uploading a whole video to keep only its sound wastes time and data, and hands over the footage too. The audio track is read and saved right here, and the file never leaves your device.

How to check for yourself

Worth knowing

  • About the MP4. An MP4 that won’t play is rarely broken; it usually holds a newer codec such as HEVC or AV1 that the player doesn’t support.
  • About the OPUS. WhatsApp voice notes exported from a phone are Opus files, sometimes named .ogg, which many players and transcription services refuse.
  • AVI, WMV, FLV and other older formats use the FFmpeg engine, a one-time 31 MB download.

Questions

Does extracting OPUS from an MP4 lose quality?

The soundtrack is compressed again as OPUS. At 192 kbps the difference from the original is inaudible for nearly everyone.

Can I get the audio from only part of the video?

Yes. Set a start and end time before converting, and only that section is saved as OPUS.

Read more about this

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