Convert Y4M to MP4 — usually much smaller files
Free and unlimited, and nothing is uploaded: it all runs in your own browser. Open Video Converter
What changes when you convert Y4M to MP4
- Y4M video is lossless and MP4 video is lossy: the quality slider decides how much detail is traded for size, and output files are usually far smaller.
- Both formats support animation; animated input stays animated where the target truly supports it.
- MP4 video encoding exposes a quality control; around 80 is the usual sweet spot.
How to convert Y4M to MP4
- Add your Y4M file — drag it onto the page or choose it. It stays on your device.
- Pick MP4 as the output format and set the quality slider.
- Press convert and download the result — individually or as one ZIP.
Questions
How do I convert Y4M to MP4 for free?
Add your Y4M file on this site, choose MP4, and press convert. The whole conversion runs in your own browser — nothing is uploaded — and the MP4 file downloads straight from your device.
Will converting Y4M to MP4 lose quality?
Y4M video is lossless and MP4 video is lossy: the quality slider decides how much detail is traded for size, and output files are usually far smaller.
Does MP4 keep everything Y4M supports?
Yes within the format’s own limits — pixels, timing and structure survive the conversion.