This free online MP4 to Opus converter lets you change mp4 video files into opus audio format right inside your web browser. There is nothing to install, no account to create and no watermark added to your result.
Unlike most converters, EverythingConverter never uploads your files to a server. The entire MP4 to Opus conversion happens locally on your own device, which means your documents and media stay completely private and the process works even on slow connections.
How to convert MP4 to Opus
- Click the upload area above or drag and drop your MP4 file into it. You can also browse and pick a file from your device.
- EverythingConverter reads the file directly in your browser and starts to extract the audio as Opus automatically. Nothing is sent to any server.
- When the conversion finishes, your new Opus file downloads right away. You can convert another file at any time, completely free.
MP4 and Opus explained
What is a MP4 file?
MP4 is the most universal video format, playable on nearly every device and platform. It combines H.264 video with AAC audio for an excellent balance of quality and file size.
What is a Opus file?
Opus is a modern, open audio codec built for both speech and music. It delivers outstanding quality at very low bitrates and powers voice chat in apps like Discord and WhatsApp.
Convert MP4 to Opus on any device
You can convert MP4 to Opus on Windows, Mac, Linux, Chromebook, Android and iPhone, straight from Chrome, Safari, Edge or Firefox. There is no app to install and no account to create. Because the conversion runs on your own device, it also works offline once the page has loaded, and you can convert as many files as you want.
Frequently asked questions
How do I convert MP4 to Opus for free?
Upload your MP4 file to the converter above and it will be turned into a Opus file automatically. The tool is completely free, with no limits on how many files you can convert and no watermark on the result.
Is it safe to convert MP4 to Opus here?
Yes. EverythingConverter converts your MP4 file entirely inside your browser. Your file is never uploaded to a server, so no one but you ever has access to it. This makes it one of the most private ways to convert MP4 to Opus online.
Can I convert multiple MP4 files at once?
Yes. You can drop or select as many MP4 files as you like and they are all converted to Opus in one batch, then bundled into a single ZIP download. It is the fastest way to bulk convert MP4 to Opus.
Do I need to install any software?
No. The MP4 to Opus converter runs in any modern web browser on Windows, macOS, Linux, Android and iOS. There is nothing to download or install.
Is there a file size limit?
Because the conversion runs on your own device, the practical limit depends on your computer's memory rather than a server quota. Most everyday MP4 files convert instantly, and there is no artificial cap.
How long does it take to convert MP4 to Opus?
For typical files it is almost instant, since the conversion happens locally with no upload or download wait. Large media files take a little longer because your device does the encoding, but there is never a queue.
What is the difference between MP4 and Opus?
MP4 is the most universal video format, playable on nearly every device and platform. It combines H.264 video with AAC audio for an excellent balance of quality and file size. Opus is a modern, open audio codec built for both speech and music. It delivers outstanding quality at very low bitrates and powers voice chat in apps like Discord and WhatsApp. Converting MP4 to Opus gives you the strengths of the Opus format for your specific use case.
Does this keep the video?
No. This tool extracts only the audio track from your MP4 video and saves it as Opus. It is the perfect way to pull music or sound out of a video file.