AVIF to AV1 Converter

How to Convert AVIF to AV1 Video Online

1. Upload Your AVIF Files: Drag and drop one or more AVIF stills, or click "Add Files". Batch upload is supported, and the order in the list determines the order in the merged video.
2. Pick Merge Strategy: Choose "Merge images" to assemble all uploaded AVIF stills into a single AV1 video, or "Video per image" to emit one AV1 video per input file. Image Duration controls how long each still holds on screen, from 1/60s (one frame at 60fps) up to 10 seconds.
3. Set Quality Preset and Resolution (Optional): Under File Compression, switch between Constant Quality and Constraint Quality and pick a preset (Highest, Very High [recommended], High, Medium, Low, Very Low, Lowest). Under Video Resolution, keep original, pick a preset (4320p down to 144p), or enter exact width and height. Audio codec defaults to Opus and Background Color defaults to Black for letterboxed frames.
4. Convert and Download: Click Convert. Files process in your browser session — no sign-up, no watermark, no upload to a third-party account.

Why Convert AVIF to AV1 Video?

AVIF and AV1 share the same compression engine — AVIF is literally an AV1 keyframe stored inside a HEIF/ISOBMFF container, per the AV1 Image File Format spec from the Alliance for Open Media. Converting a sequence of AVIF stills to an AV1 video repackages those keyframes into a temporally-coded stream so they can be played as a slideshow, timelapse, or short clip without re-transcoding to a less-efficient codec like H.264.

• Bandwidth-efficient slideshows for the web — AV1 typically delivers around 50% lower bitrate than H.264/x264 at similar quality (per Facebook's 2018 measurements cited on Wikipedia's AV1 page). For a 30-second product slideshow, that means a fraction of the egress cost on Cloudflare or S3 vs. the same content as H.264 MP4.
• Photo timelapses — A burst of 600 AVIF stills at 1/30s per frame becomes a 20-second AV1 timelapse. Because the source is already AV1-coded, the conversion is fast and avoids the generation loss of decoding to RGB and re-encoding to a different codec.
• YouTube and streaming uploads — YouTube transcodes uploads to AV1 for high-traffic videos, and uploading AV1 directly skips one transcode step. Netflix, Twitch, and Vimeo also support AV1 ingest.
• Codec-consistent pipelines — If your site already serves AVIF stills, an AV1 video keeps the entire visual layer in one codec family, simplifying client-side hardware decoder reuse on devices with AV1 acceleration.
• Modern hardware decode — AV1 hardware decode is in NVIDIA RTX 30-series and later, AMD RDNA 2 and later, Intel Arc and 11th-gen Xe iGPUs, Apple A17 Pro / M3 and later, and Qualcomm Snapdragon 8 Gen 2 and later — so the resulting videos play back without burning CPU on a wide range of devices.
• Fallback-free animated content — Unlike animated AVIF (which has spotty playback support outside Chrome/Firefox), AV1 in MP4 or WebM plays in every modern browser via the standard <video> tag.

AVIF Still vs AV1 Video — Format Comparison

AV1 Container Quick Guide

The AV1 bitstream from this tool is muxed into a standard video container. Here's what each option implies:

Frequently Asked Questions

Are AVIF and AV1 the same format?

No. AVIF and AV1 use the same compression engine, but they're different files. AVIF stores a single AV1 keyframe (or a short image sequence) inside a HEIF/ISOBMFF container with the .avif extension and an image/avif MIME type. AV1 video is a temporally-coded stream — keyframes plus inter-frames — usually delivered in MP4 or WebM. Per the official AV1 Image File Format specification, AVIF "supports the storage of a subset of the syntax and semantics of an AV1 bitstream in a HEIF file."

Why convert AVIF stills to AV1 video instead of GIF or MP4 (H.264)?

Compression. A sequence of AVIF photos converted to AV1 is typically 50% smaller than the same content as H.264 MP4 and an order of magnitude smaller than animated GIF. For a 5-second product loop at 1080p, that can be the difference between a 200 KB AV1 file and a 5 MB GIF. If you specifically need legacy compatibility, see our AVIF to MP4 or AVIF to GIF tools instead.

How long will each AVIF image display in the output AV1 video?

You set this with the Image Duration control. Options range from 1/60s (one frame, useful for high-frame-rate timelapses) up to 10 seconds per still. Common picks: 1/24s and 1/30s for cinematic timelapses, 3 to 5 seconds for slideshows, 1 to 2 seconds for product image carousels.

Will my output AV1 video play on iPhone and Safari?

iOS 17 and macOS Sonoma added AV1 video decoding support in Safari 17, per caniuse AV1. On iPhones with the A17 Pro chip or newer (iPhone 15 Pro and 16 series) and Macs with M3 silicon, AV1 decode is hardware-accelerated; older devices fall back to software decode, which works but uses more battery for long videos. Chrome, Firefox, and Edge have supported AV1 since 2019.

Can I merge multiple AVIF files into a single AV1 video?

Yes. Pick "Merge images" under Merge Strategy. All uploaded AVIF files are concatenated in the order they appear in the upload list, each held for the Image Duration you set. Pick "Video per image" instead if you want one separate AV1 file per input.

What audio does the output have?

By default, none — the AV1 video is silent because the source AVIF stills carry no audio. The audio codec dropdown defaults to Opus and is used only if your specific export needs an audio track. If you need to add a soundtrack after conversion, you can mux audio in with a separate tool.

What resolution should I pick?

Keep "Original" if all input AVIFs share the same dimensions and you don't need to resize. Pick a preset (e.g. 1080p for YouTube, 720p for social embeds, 4320p for 8K archival) when targeting a specific platform. The Background Color setting (default Black) fills the frame when an input image's aspect ratio doesn't match the chosen resolution.

What's the difference between Constant Quality and Constraint Quality?

Constant Quality (CRF-style) targets a perceptual quality level and lets bitrate vary — pick this when you care about visual fidelity and don't have a strict file size budget. Constraint Quality caps the bitrate so file size is more predictable — pick this when uploading to platforms with size limits or when bandwidth is the binding constraint. For most web slideshows, Constant Quality at "Very High" produces the smallest file at indistinguishable quality.

Can I convert in the other direction — AV1 video back to AVIF stills?

Yes, use AV1 to AVIF to extract frames from an AV1 video into AVIF stills. You can also start from other sources: PNG to AV1, JPG to AV1, or HEIC to AV1 work the same way as this tool but with different input formats.