AVIF to MP4 Converter

Convert AVIF to MP4

AVIF is a modern image format — an AV1-compressed still stored in a HEIF container — and outside a recent browser, almost nothing will open one. Converting to MP4 wraps that image into the most widely supported video container, producing a short, silent clip that plays on phones, TVs, editors, and social feeds without a plugin. You choose how long the still is shown, so an AVIF photo becomes a 5-second (or longer) MP4 you can drop straight into a video timeline.

AVIF Format at a Glance

MP4 Format at a Glance

How to Convert AVIF to MP4

1. Upload Your AVIF File: Drag and drop your file onto the page, or click "+ Add Files" to browse. You can add several AVIFs at once.
2. Choose a Merge Strategy and Duration: Pick "Video per image" to turn each AVIF into its own MP4, or "Merge images" to stitch several stills into one slideshow clip. Set "Duration" (default 5 seconds per frame) to control how long each image is shown.
3. Set Background Color, Quality, and Resolution: The "Background Color" (White by default) is the color transparent areas are composited onto during encoding — MP4 has no alpha channel — and it also fills any letterbox bars when the output resolution's shape differs from your image. Choose a "Quality Preset" — Very High (Recommended) keeps detail — and optionally set a fixed "Video resolution". Under Advanced Options you can switch the "Video Codec" from H.264 to H.265 or AV1.
4. Convert and Download: Click "Convert" and save your MP4. No sign-up, no watermark — files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours.

Frequently Asked Questions

What does converting AVIF to MP4 actually produce?

A short, silent MP4 clip built from your AVIF still image. You set how long the image is shown with the "Duration" control, so a single photo becomes a fixed-length video clip. In our testing, a full-resolution AVIF at "Very High (Recommended)" and the default 5-second Duration produced a clean silent MP4 of just a few hundred kilobytes — small because a static frame encodes to one keyframe plus almost no motion data.

Does this preserve an animated AVIF's motion?

No. This converter treats each AVIF as a single still image and builds a silent clip from it, rather than reproducing frame-by-frame motion from an animated sequence. In practice this is rarely a limitation, because the overwhelming majority of AVIF files on the web are single still photos. If keeping motion matters, hold onto an animation-native format instead of converting to a still-based MP4.

What happens to transparency in my AVIF?

MP4 has no alpha channel, so transparency cannot be carried over. Transparent pixels are composited onto the "Background Color" option during encoding — white by default, or any color you pick from the dropdown — and semi-transparent edges blend smoothly into it. To make the backdrop match where the video will be used, just pick that color. If you need to keep transparency, convert to a still image format such as AVIF to PNG instead.

Why is the MP4 sometimes larger than the AVIF it came from?

AVIF is built on the AV1 codec, one of the most space-efficient still-image formats available, so the source file is already very small. The default MP4 output uses H.264, an older codec with looser compression, and wrapping it in a video container adds keyframe and header overhead. The result is a much more compatible file that is often larger byte-for-byte — that trade is the whole point of the conversion.

Which video codec does the output use, and can I change it?

The MP4 defaults to H.264, which is what gives the file its near-universal playback. Under "Video Codec" in Advanced Options you can switch to H.265 (HEVC) or AV1 for a smaller file, but those need newer hardware to decode, so H.264 remains the safest choice for sharing.

Will the MP4 upload to Discord, Gmail, or social apps?

Yes — that is the main reason to convert. A raw AVIF is rejected or shown as a broken image by most of these services, while MP4 is accepted almost everywhere. A short clip built from a still AVIF easily fits Gmail's 25 MB attachment limit and Discord's 10 MB free upload cap; if a longer or higher-resolution clip is too big, lower the "Quality Preset" or reduce the "Video resolution".

Does the output MP4 have sound?

No. An AVIF is an image with no audio track, so the resulting MP4 is silent by design — there is nothing to encode. If you later want a soundtrack, add one in a video editor after the conversion.

Is the AVIF specification still maintained?

Yes. AVIF is published by the Alliance for Open Media; the first stable specification (v1.0.0) landed in February 2019 and has since been revised — v1.2.0 aligns it with the current HEIF, ISOBMFF, and MIAF standards. It remains an actively developed, royalty-free format built on the AV1 codec.

Are my uploaded AVIF files kept private?

Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark, never shared or made public. If you only need a static image rather than a video, AVIF to JPG produces a plain picture instead.