MP4
MP4 video
MP4 is the video container everything plays. It normally holds H.264 video and AAC audio, a pairing that phones, browsers, TVs and social networks all accept.
Opens in Every phone, browser, TV, console and editor
MP4 converterMP4 to OPUS converter, without the upload.
Pull the audio out of an MP4 video as an OPUS. It is converted in your browser, so the file never leaves your device.
Drop MP4 files here
or choose from your computer paste with Ctrl V
from Photos or Files
Ready · other file types work too0 bytes uploaded, ever
Convert to
- On your device · nothing is uploaded
- No account, no email
- Batch and ZIP download
- Free
- OPUS: sound only
How to convert MP4 to OPUS
Add your MP4 videos
Drop MP4 files onto the box above, or click it to choose them. ToAny reads the file's contents to detect the type, so a wrong extension does not matter.
OPUS is already chosen
Press Convert. Open Options first if you want to change the defaults. The work happens in this tab and can take a while for large files.
Download
Save the OPUS, or download everything as one ZIP if you converted several files.
Why ToAny
Private by construction
The MP4 to OPUS converter is part of this page and runs inside your browser. Your videos are never sent to ToAny or to anyone else.
No upload, no queue
Nothing has to travel to a server and back, so work starts the moment you press Convert. How long it takes depends on your device and the size of the file.
Free, without an account
No sign-up, no email address and no watermark. Add several files and download them together as a ZIP.
MP4 to OPUS: what to expect
MP4 is a delivery format: other tools sometimes need audio only, a GIF, or a different container. Opus sounds better than MP3 or AAC at low bitrates. MP4 is at home in sharing and uploading video anywhere; OPUS is the usual choice for voice and music at low bitrates. The OPUS contains the soundtrack only; the picture is dropped.
The defaults suit most files. Under Options you can choose the bitrate and trim the start and end. This is demanding work for a browser: a long or high-resolution file can take several minutes, and your device does all of it, so keep the tab open.
The conversion uses your browser's own video and audio codecs (WebCodecs), with hardware acceleration where the device has it; the file is read from disk as it goes and can be up to 2 GB. Where the browser lacks a codec, the page falls back to the compatibility engine. OPUS is written at 128 kbps unless you choose another bitrate.
MP4 vs OPUS
OPUS
Opus audio
Opus is a modern open codec that sounds good at very low bitrates. WhatsApp voice notes, Discord and video calls use it. Standalone .opus files are less widely supported than the codec itself.
Opens in Current browsers, Android, VLC; many music apps and hardware players do not
OPUS converter| MP4MP4 video | OPUSOpus audio | |
|---|---|---|
| Stands for | MPEG-4 Part 14 | Opus |
| Type | Video container | Audio |
| Compression | Lossy | Lossy |
| Introduced | 2001, by the Moving Picture Experts Group | 2012, by the Internet Engineering Task Force (with Xiph.Org, Mozilla and Skype) |
| Opens in | Every phone, browser, TV, console and editor | Current browsers, Android, VLC; many music apps and hardware players do not |
| Best for | Sharing and uploading video anywhere | Voice and music at low bitrates |
| File extension | .mp4 | .opus |
Questions
Are my videos uploaded anywhere?
No. The MP4 to OPUS conversion runs inside your browser, on your own phone or computer. The file is not sent to ToAny or to anyone else.
Does converting MP4 to OPUS reduce quality?
The soundtrack is re-encoded as OPUS. OPUS is lossy, but at a normal bitrate the difference is hard to hear. You can choose the bitrate under Options.
Can I convert several MP4 files at once?
Yes. Add as many as you like, convert them together and download each result or all of them as one ZIP.
How do I convert MP4 to OPUS on Windows, Mac, iPhone or Android?
The steps are the same everywhere because ToAny runs in the web browser: open this page in a current version of Chrome, Edge, Safari or Firefox, add the MP4 file, press Convert and save the OPUS. There is nothing to install.
Is there a file size limit?
Yes. Files up to 2 GB are accepted. Beyond that the limit is your device's memory, since nothing is uploaded; a computer copes with large files better than a phone.