Convert AVIF to APNG Online

AVIF to APNG Converter

AVIF and APNG are both animation-capable still-image formats, but they solve different problems. AVIF is an AV1 payload in an ISO base media container and is built for bandwidth; APNG is an extension of PNG itself, and its animation degrades gracefully — a decoder that does not understand it simply shows the first frame as an ordinary PNG. Converting AVIF to APNG is what you do when an editor, chat client, sticker pipeline or older viewer plays animated PNG but chokes on animated AVIF, and when you need the alpha channel to survive intact.

AVIF Format at a Glance

APNG Format at a Glance

How to Convert AVIF to APNG

1. Upload Your AVIF Files: Drag and drop one animated AVIF, or add several stills in the order you want them to play. Batch uploads are supported and all files share the same settings.
2. Choose Single Animation or Individual Files: The Combine? control defaults to Single animation, which assembles every uploaded image into one APNG. Switch to Individual files to get one APNG per upload instead.
3. Set the Framerate: Framerate defaults to 10 FPS (Recommended) and ranges from 1 FPS (a slideshow) to 50 FPS. It sets the delay between frames, so it directly controls playback speed and, on long sequences, file size.
4. Convert and Download: Click Convert and save the animated PNG. Files upload over an encrypted connection, are processed on our servers, and are deleted automatically after a few hours — no sign-up, no watermark.

Under Image resolution you can also leave the default Keep original or scale the output by percentage, to a preset height, or to an explicit width and height. Because the assembler requires uniform frame dimensions, differently-sized uploads are normalised onto a common canvas at that scale before assembly.

What Each Kind of Upload Produces

• One animated AVIF — the animation track is located and transcoded frame for frame into an APNG that loops indefinitely.
• One still AVIF — there is nothing to animate, so the output is an ordinary static PNG without the acTL/fcTL/fdAT animation chunks. It opens everywhere a PNG does; if you need genuine animation, supply a sequence of frames.
• Several stills with Single animation — one APNG playing them in upload order, each frame held for 1/Framerate of a second.
• Several stills with Individual files — one APNG per upload, each converted with the same settings.
• Anything with an alpha channel — the alpha is preserved. APNG stores full 8-bit transparency, so anti-aliased edges and partial opacity carry over exactly.

Frequently Asked Questions

Is APNG actually part of the PNG standard, or a Mozilla extension?

It is part of the standard now. Animated PNG began as a Mozilla proposal in the mid-2000s and lived outside the specification for years, but the W3C PNG Specification (Third Edition), published as a Recommendation on 24 June 2025, folds it in: section 4.9 defines frame-based animation and the acTL, fcTL and fdAT chunks. It also keeps the original backward-compatibility promise — a static-only decoder ignores those ancillary chunks and shows the base image.

Will the conversion keep AVIF's transparency?

Yes, and this is the main reason to pick APNG over GIF. AVIF carries alpha as a dedicated auxiliary image item; APNG carries full 8-bit alpha per pixel. Soft, anti-aliased edges and partial opacity survive with no visible change. GIF, by contrast, only has one fully transparent palette index, which turns those same edges into a hard 1-bit cutout — see AVIF to GIF if legacy reach matters more than edge quality.

Can I convert an animated AVIF, not just a set of stills?

Yes. Animated AVIF files (sometimes saved with an .avifs extension) store their frames as an AV1 image sequence in a track, and our converter probes each upload for exactly that structure. When it finds one, the animation track is transcoded rather than the single still image the same file also exposes — a distinction that trips up naive tools and silently gives them a one-frame output.

Why is my APNG so much larger than the AVIF?

Because the two use completely different compression. AVIF applies AV1's video-grade coding, including prediction between frames; APNG applies DEFLATE to each frame independently and is lossless, so it stores far more data for the same picture. A multiple-times size increase is normal. To bring it down, reduce the output resolution or lower the Framerate so there are fewer frames to store.

How is the animation speed calculated?

The per-frame delay is exactly 1 divided by the Framerate you choose, so 10 FPS gives a 0.1-second delay and 25 FPS gives 0.04 seconds. Our pipeline passes that value straight to the assembler and sets the loop count to zero, which the APNG specification defines as looping forever. There is no separate "delay" field to fight with.

Does this converter reduce colours or quantise the palette?

No. This converter keeps the frames at their full truecolour data and 8-bit alpha; there is no palette step to opt into, and no quality slider either. If the result needs to be smaller, the APNG compressor is the page with size targets and an Auto Scale option. After assembly we run a lossless optimisation pass (Zopfli-based) that shrinks the file without touching a single pixel value.

What happens on browsers or apps that do not support APNG?

They show the first frame as a normal PNG. That graceful degradation is written into the format and is the practical reason to prefer APNG over animated AVIF for wide distribution: current data puts APNG at roughly 95.9% browser support versus about 94.7% for AVIF, and the AVIF figure includes browsers that handle still AVIF but not animation — Firefox only gained animated AVIF in version 113.

Should I use APNG or WebP for an animated logo?

APNG when fidelity and predictable fallback matter: it is lossless, truecolour, and degrades to a clean first frame. Animated WebP when size matters more, since it supports lossy frames and typically lands much smaller. Note that our AVIF to WebP converter writes still images, so assembling an animated WebP takes a dedicated tool such as webpmux from Google's libwebp.

Are my uploaded images kept or shared?

No. Your files travel over an encrypted connection, are processed on our servers, and are deleted automatically after a few hours together with the APNG we generate. There is no sign-up, no watermark, and nothing is shared or made public.