How to convert Y4M to MP4
To convert Y4M to MP4, upload your Y4M file, choose MP4 as the output format and press Convert. The finished MP4 file is ready to save to your phone or computer in seconds, free, with no watermark and no sign-up. Your file is deleted from our server about 30 minutes after the conversion.
This free online converter turns Y4M videos into MP4 files in your browser, with no software to install and no watermark. When the video and audio inside your Y4M file can be placed in MP4 as they are, the streams are copied without re-encoding, which is faster and keeps the original quality. Otherwise the video is re-encoded as H.264 video with AAC audio.
What you get with Y4M to MP4
- Plays on virtually every phone, TV, browser and editor
- Good quality at small file sizes
- Works well for streaming and social media uploads
- Plays on: Windows, macOS, Android, iOS, smart TVs, game consoles and every major browser
What to expect from this conversion
- Expect a smaller file than the Y4M original, because MP4 compresses more efficiently.
- Y4M files are huge because they are uncompressed, so uploads can take a while on slower connections.
- The first audio track is kept. Subtitle tracks, extra audio tracks and chapters are not included in the converted file.
Y4M vs MP4
| Property | Y4M | MP4 |
|---|---|---|
| Full name | YUV4MPEG2 | MPEG-4 Part 14 |
| Released | 2000, MJPEG Tools / Xiph.Org | 2001, ISO/IEC (MPEG) |
| Generation | Niche | Modern |
| Typical file size | Huge | Small |
| Plays on | ffmpeg, x264, x265, aomenc, VLC and other video tools | Windows, macOS, Android, iOS, smart TVs, game consoles and every major browser |
| Best for | benchmarking codecs; feeding raw video to encoders | uploading to YouTube, Instagram, TikTok and WhatsApp; sharing a video that has to play everywhere |
Steps to convert Y4M to MP4
- Drop your Y4M video file onto the converter, or click to choose it.
- Check that MP4 is selected as the target and adjust the options if you want.
- Press Convert, then download your new MP4 file when it finishes.
Tips for the best result
- Leave Fast mode on to keep the original quality whenever the streams can be copied.
- Pick a lower resolution if the file is for a phone or messaging app.
- Use Mute if you only need the picture.
Frequently asked questions
How do I convert Y4M to MP4?
Upload your Y4M file, make sure MP4 is the selected target and press Convert. When the progress bar finishes, download the MP4 file. No account or software is needed.
Is the Y4M to MP4 converter free?
Yes. It is free, with no watermark, no sign-up and no daily limit on how many files you convert. The site is supported by ads.
Will I lose quality when converting Y4M to MP4?
Not necessarily. If the video and audio streams already fit inside MP4, they are copied without re-encoding, so quality stays identical. If the file has to be re-encoded, the High setting keeps almost all visible detail, while Small trades some detail for a smaller file.
Why is my MP4 file smaller than the Y4M original?
Expect a smaller file than the Y4M original, because MP4 compresses more efficiently. Choosing a lower quality or resolution reduces the size further.
Which devices can play MP4 files?
MP4 files play on Windows, macOS, Android, iOS, smart TVs, game consoles and every major browser.
How large a file can I upload?
You can upload videos up to 500 MB. Files are deleted from the server about 30 minutes after conversion.