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AVIFS MP4
File conversion

Convert AVIFS to MP4

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Verified by Adam B.· reviewed by FE Editorial ·updated Jul 1, 2026
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Is it possible to convert AVIFS to MP4?
Yes - AVIFS converts to MP4.

You can do it right here with our free converter - no sign-up, and your file is deleted right after.

FFmpeg is the reliable route: it decodes the AVIF sequence and encodes an H.264 MP4 in one command. HandBrake gives a GUI but relies on FFmpeg-style decoding under the hood, so a current build is needed. MP4 has no alpha channel, so any transparency in the AVIF is lost.

Also to MP4: AVCHD · USM · MXF

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Tested on macOS, Windows & Linux
Last verified Sep 2026

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AVIFS → MP4 converterFREE
Drop a .AVIFS file here
or pick one - we convert it to .MP4 and give you the file to download

Why convert AVIFS to MP4?

Converting .avifs to .mp4 makes an animation playable in every video player and social platform, and MP4's H.264/H.265 compression is far more efficient than GIF for longer or high-resolution clips.

How to convert AVIFS to MP4

FFmpeg OPEN-SOURCE

Run ffmpeg -i in.avifs -c:v libx264 -pix_fmt yuv420p -movflags +faststart out.mp4. The yuv420p flag keeps the file compatible with all players.

HandBrake FREE

Open HandBrake, load the .avifs as the source, pick the Fast 1080p30 preset with an MP4 container and click Start Encode. Requires a recent build that can read AVIF sequences.

FFmpeg (HEVC) OPEN-SOURCE

For smaller files run ffmpeg -i in.avifs -c:v libx265 -pix_fmt yuv420p out.mp4 to encode H.265/HEVC instead of H.264.

About these formats

.AVIFS AVIF Image Sequence

An .avifs file is an animated image built from a sequence of AVIF frames, wrapped in the same ISOBMFF container that MP4 and HEIF use. The Alliance for Open Media created it as the animated…

Open .AVIFS details →
.MP4 MPEG-4 Part 14 Video File

An MP4 file is a video container (MPEG-4 Part 14, standardized 2003) that holds video, audio, subtitles, and chapters in one file. It plays on every phone, computer, browser, and smart TV…

Open .MP4 details →

Quality & what to watch

  • 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 avifdec first, 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.