How to convert AVIFS to MP4
- Add your .AVIFS file - drop it in the box above or click to browse.
- Convert it to .MP4 in a few seconds.
- Download your new .MP4 file.
What to expect
- MP4 video has no alpha channel, so transparent AVIF regions are flattened onto a solid (usually black) background.
- Re-encoding is lossy: fine detail and sharp edges soften slightly versus the AVIF source.
- Decoding animated AVIF is still patchy in some FFmpeg/HandBrake builds; if it fails, decode frames with libavif's
avifdecfirst, then encode the PNG sequence to MP4.
Frequently asked questions
Why does my MP4 lose transparency?
The MP4/H.264 pipeline has no alpha channel, so any transparent areas are composited onto a background color.
Which is better, H.264 or H.265?
H.264 (libx264) plays everywhere; H.265 (libx265) makes smaller files but needs newer players.
Why won't HandBrake open my .avifs?
Only recent HandBrake builds decode animated AVIF; update it or convert via FFmpeg instead.
How do I keep the original frame rate?
FFmpeg preserves the source frame rate automatically; add
-r 30 only if you want to force a specific rate.
