AVIF to MP4 Converter

Convert AVIF to MP4 Online

AVIF can hold a single still image or a full animated sequence, and almost nothing outside a recent browser will play one back. Converting to MP4 wraps that frame — or the whole animation — into the most widely supported video container, so it plays on phones, TVs, editors, and social feeds without a plugin. A still AVIF becomes a short MP4 clip you can set to any duration; an animated AVIF becomes a true video at its original frame timing.

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: Pick "Video per image" to turn each AVIF into its own MP4, or "Merge images" to stitch multiple stills into a single slideshow clip. For a still source, set "Duration" (default 5 seconds per frame) to control how long each frame is shown.
3. Set Background Color and Quality: Because MP4 has no alpha channel, transparent areas are filled with the "Background Color" (Black by default). Choose a "Quality Preset" — Very High (Recommended) keeps detail; lower presets shrink the file. Optionally set a fixed "Video resolution".
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.

AVIF vs MP4 at a Glance

Frequently Asked Questions

Does this work on a still AVIF, or only an animated one?

Both. An animated AVIF is rebuilt as a real MP4 video at its original frame timing. A single still AVIF is wrapped into a short clip — you control its length with the "Duration" setting, so a static image can become a 5-second (or longer) MP4 you can drop into a video timeline.

What happens to the transparent areas in my AVIF?

MP4 (with H.264, the default codec here) has no alpha channel, so transparency cannot be preserved. Any transparent pixels are flattened against the "Background Color" you choose — Black by default, but you can switch it to White or any other color to match where the video will be used.

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

AVIF is built on the AV1 codec, which is 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 video adds container and keyframe 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 smaller files, but those need newer hardware to decode, so H.264 is the safest choice for sharing.

Will the MP4 upload to Discord, Gmail, or Instagram?

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 converted from a still AVIF easily fits Gmail's 25 MB attachment limit and Discord's 10 MB free upload cap; for a long animated source, lower the "Quality Preset" if the file is too big.

How is the MP4's quality and frame rate decided?

In our testing, a single-frame AVIF at "Very High (Recommended)" and the default 5-second duration produces a clean, full-resolution MP4 of just a few hundred kilobytes. For an animated AVIF we keep the source frame timing so motion looks identical to the original; the "Quality Preset" controls how aggressively each frame is compressed, trading file size against sharpness.

If you only need a looping animation rather than a video file, try AVIF to GIF instead, or go the other way with GIF to MP4.