What Is AVIF? A Plain-English Guide to the Image Format Taking Over the Web

If you've downloaded a photo recently and noticed it ends in .avif instead of the familiar .jpg, you're not imagining things. AVIF has been steadily rolling out as the default export format across cameras, phones, content management systems, and photo-editing tools over the past few years, often without much fanfare. This guide covers what AVIF actually is, where it came from, and why it might be showing up in your downloads folder more often than it used to.

AVIF, defined simply

AVIF stands for AV1 Image File Format. As the name suggests, it's built on AV1, a video compression standard developed by the Alliance for Open Media — a coalition that includes Google, Apple, Amazon, Netflix, Microsoft, and Mozilla, among others. AVIF essentially takes a single frame of AV1-encoded video and packages it as a standalone still image. That inheritance matters, because video codecs are engineered under intense pressure to squeeze as much visual quality as possible out of as few bits as possible — and AVIF benefits directly from decades of that engineering work.

In practical terms, this means AVIF images can look just as sharp as a JPG or PNG while taking up noticeably less disk space — often 40 to 50% smaller at a comparable visual quality, according to comparisons published by Google and various independent testing groups. For a website serving thousands of images, that difference adds up to real, measurable improvements in page load time.

Why AVIF exists at all

JPG has been the dominant photo format since the early 1990s, and PNG has covered lossless and transparent graphics since the mid-90s. Both have served the web well, but both were designed for a different era of internet connections and storage costs. As displays got sharper, images got bigger, and the volume of images on an average webpage exploded, the pressure to find a more efficient format only grew.

WebP was Google's first major attempt to address this gap back in 2010, and it's now widely supported. AVIF is the next step in that same lineage, generally outperforming WebP on compression efficiency, particularly for high-detail photographic content. It also supports features that older formats either lack or only partially support, including high dynamic range (HDR) imagery, wide color gamuts, and transparency — all in a single, relatively compact file format.

What makes AVIF technically different

Traditional formats like JPG use a fairly simple, decades-old compression algorithm based on discrete cosine transforms applied to 8x8 pixel blocks. AVIF, inheriting AV1's toolkit, has access to much more sophisticated prediction and transform techniques — things like larger and more flexible block sizes, better prediction of pixel values based on neighboring content, and more refined handling of color information. The result is fewer visible compression artifacts at a given file size, especially in areas with fine detail, smooth gradients, or subtle color transitions where JPG tends to show blockiness or banding.

AVIF also supports both lossy and lossless compression modes, similar to how PNG offers lossless compression, but AVIF's lossless mode is typically more space-efficient than PNG's for equivalent image content. That flexibility is part of why AVIF has been positioned as a genuine JPG and PNG replacement rather than just a niche alternative.

Where you're likely to run into AVIF files

A few common sources tend to produce AVIF files without necessarily telling you upfront:

• Websites and content management systems that automatically convert uploaded images to AVIF to speed up page loading for visitors.
• Some Android phones and camera apps that default to AVIF for photo storage to save space.
• Design and photo tools that added AVIF as an export option and, in some configurations, made it the default.
• Screenshot and screen-recording software increasingly offering AVIF as a lightweight still-image output.

In each case, the AVIF file usually looks identical to what you'd expect from a JPG or PNG when viewed in a modern browser — the format switch is invisible until you try to open the file somewhere that doesn't support it yet.

The compatibility gap

This is really the crux of why AVIF causes friction despite its technical advantages. Browser support is genuinely excellent at this point — Chrome, Edge, Firefox, and Safari can all display AVIF images natively. But browsers are only one part of the software ecosystem. Plenty of tools outside the browser haven't caught up: some older versions of design software, certain print workflows, various marketplace upload forms, some email clients, and a long tail of smaller apps and services that simply haven't added AVIF decoding support yet.

That gap is exactly the situation this site's AVIF to JPG and PNG converter is built to solve. Rather than waiting for every tool in your workflow to catch up with AVIF, you can convert the specific files you need into a format that's already universally supported, right when you need it, without installing anything.

Is AVIF actually better than JPG and PNG?

For most photographic use cases, yes — smaller files at similar visual quality is a genuinely useful trade-off, particularly for anything served over the web where load time affects both user experience and, for many sites, search ranking. AVIF's HDR and wide-gamut support also makes it a better long-term fit as displays capable of showing that extra color and brightness range become more common.

That said, "better" doesn't mean "universally supported yet," and for now that distinction matters more day-to-day than the compression numbers do. If you need an image to open reliably in software you don't control — a client's design tool, a print shop's intake system, an older content management system — JPG and PNG remain the safer bet simply because of how long they've had to become the default everywhere.

The practical takeaway

AVIF isn't a fad or a format you need to avoid — it's a genuinely well-engineered successor to JPG and PNG that's slowly becoming the new default across much of the web. The friction it causes today is a compatibility problem, not a quality problem, and that kind of problem tends to shrink over time as more software adds support. Until then, converting AVIF files to JPG or PNG when you need broader compatibility is a quick, one-time fix rather than a sign anything's gone wrong with the format itself.