Convert any video file to Opus format online for free. Fast, secure, and easy-to-use video to Opus converter with no software installation required.
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Max file size: 50 MBMax duration: 30 min
Sign up for increased limitsA free account gets you up to 50 MB and 30 min.
Drag and drop your MP4 file, or click to browse for it.
Choose Opus as the output and click Convert. The conversion runs on our servers, so your device does none of the work.
Download your converted file instantly. The download link expires in 1 hour for security.
Our powerful servers process your files quickly, delivering converted files in seconds.
Convert your files completely free with no hidden costs or subscription fees.
Your file is used only to make your conversion. It is never published or shared, and the download link expires after one hour.
Works directly in your web browser. No software download or installation required.
How the two formats differ on the things that change your result.
| Specification | MP4 (source) | Opus (result) |
|---|---|---|
| Container | MPEG-4 Part 14 | Ogg |
| Developed by | MPEG | Xiph.Org / IETF |
| Introduced | 2003 | 2012 |
| Audio codecs | AAC, MP3, ALAC | Opus |
| Compression | Depends on codec | Lossy |
| Approx. file size | 38–150 MB per minute | 0.48–1.44 MB per minute |
| Metadata / tags | Container tags | Vorbis comments |
| Licensing | Patent-licensed | Royalty-free |
| Plays natively on | Native: Web browsers, Windows, macOS, iOS, Android, Smart TVs | Native: Web browsers, Android · Needs a player: Windows, macOS, iOS |
| Best for | web delivery, social media uploads, sharing with anyone | voice and calls, podcasts, web delivery |
Only the soundtrack survives: the video stream is dropped, and the AAC audio inside the MP4 file is re-encoded as Opus.
The size drop is dramatic because the video stream is where nearly all the data lives. A minute of MP4 runs around 94 MB; the extracted Opus is roughly 1 MB per minute.
Any subtitle tracks in the source are not part of an audio file and are dropped during extraction.
The source can carry more than one audio track, for example alternate languages or a commentary. Extraction takes the primary track.
This tool takes the audio track from inside a MP4 file, a MPEG-4 Part 14 container from 2003, and saves it on its own as Opus. Everything visual is left behind.
MP4 comes from MPEG and dates to 2003. It usually holds H.264, H.265, or AV1 video with AAC, MP3, or ALAC sound, and those streams set the ceiling for anything converted out of it.
Opus comes from Xiph.Org / IETF and dates to 2012. It carries lossy-compressed audio (Opus), and without installing anything it plays on web browsers and Android.
After converting your file, you can use Scriptivox transcription services to convert your audio to text. Perfect for meetings, interviews, podcasts, and more.
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