What Is an AVIF File? The Modern Image Format Explained

If you've encountered a file ending in .avif and wondered what it is — or why websites are increasingly using it — you're in the right place. AVIF is one of the most capable image formats available today, and understanding how it works helps explain why it's quietly replacing older formats across the web.

The Short Answer: AVIF Is a Next-Generation Image Format

AVIF stands for AV1 Image File Format. It's an image format derived from the AV1 video codec, developed by the Alliance for Open Media — a coalition that includes Google, Apple, Mozilla, Netflix, and Microsoft, among others.

The core idea: take the compression technology from AV1 video (which is exceptionally good at reducing file size without destroying quality) and apply it to still images. The result is a format that can store high-quality images at significantly smaller file sizes than older formats like JPEG or PNG.

How AVIF Compression Actually Works

AVIF uses lossy and lossless compression — you can choose either depending on your needs.

• Lossy compression discards some image data to shrink the file. AVIF does this far more intelligently than JPEG, preserving detail where the eye is most sensitive while cutting data where it matters less.
• Lossless compression retains every pixel of the original, resulting in larger files but zero quality loss — similar to PNG, but often with better compression ratios.

What makes AVIF stand out technically:

• HDR support — AVIF can store images with a wider color range than standard displays, making it future-friendly as HDR screens become mainstream
• Wide color gamut — it supports color spaces like Display P3 and Rec. 2020
• Alpha channel — transparent backgrounds are supported, like PNG
• Animated sequences — AVIF supports animation, similar to GIF or APNG, but far more efficiently
• 10-bit and 12-bit color depth — compared to JPEG's standard 8-bit

AVIF vs. Other Image Formats

At equivalent visual quality, AVIF files are generally 20–50% smaller than WebP and 50% or more smaller than JPEG. That's a meaningful difference, especially for image-heavy websites or apps where load speed matters.

Where You'll Actually Encounter AVIF Files 🌐

On the web: Browsers including Chrome, Firefox, Safari (since version 16), and Edge now support AVIF natively. This is why many websites — particularly large platforms optimizing for page speed — serve AVIF images to supported browsers while falling back to JPEG or WebP for older ones.

In photography and creative workflows: Some image editors support AVIF export. GIMP, Photoshop (via plugins or recent updates), and Squoosh (Google's browser-based image tool) can all work with AVIF files.

In operating systems: Support is expanding but not universal. Windows 11 can display AVIF files natively (and Windows 10 with the AV1 Video Extension installed). macOS has had AVIF support since Monterey.

On mobile: Android has supported AVIF in recent versions. iOS support has grown alongside Safari's adoption.

What Determines Whether AVIF Is the Right Format for a Situation

The format has real strengths, but how useful it is depends on several variables:

Browser and OS compatibility is the first filter. If users on older systems need to view your images, AVIF alone isn't a safe choice — you'd need fallback formats. Developers often use the HTML <picture> element to serve AVIF where supported and JPEG/WebP where it isn't.

Encoding speed matters in some workflows. AVIF encoding — converting an image into AVIF format — has historically been slower than JPEG or WebP encoding. This is improving with newer encoders (like libavif and aom), but for workflows that need to process thousands of images quickly, encoding time is a real variable.

Content type affects the benefit. AVIF's compression excels with photographs and complex gradients. For simple graphics with large flat areas of color (logos, icons), PNG or SVG may still be more practical. The gains also vary depending on the specific image.

Toolchain readiness matters for designers and developers. Not every CMS, image CDN, or asset pipeline handles AVIF automatically yet. Some do — Cloudflare, Cloudinary, and Imgix, for example, can serve AVIF automatically — while others require manual setup.

The Spectrum of Users AVIF Affects Differently

Casual users may never interact with AVIF directly. If you're browsing the web, your browser handles format negotiation silently. You're likely already receiving AVIF images from some sites without noticing.

Web developers face real decisions: whether to generate and serve AVIF, which encoder to use, how to handle fallbacks, and whether their hosting or CDN supports it.

Photographers and digital artists need to check whether their editing software supports AVIF export and whether their delivery platforms can handle it. For archiving, lossless AVIF is an option, but formats like TIFF or RAW remain common for master files.

Content platform operators deal with AVIF at scale — balancing the bandwidth savings (which can be substantial across millions of images) against encoding infrastructure and compatibility concerns.

The format's benefits are real and measurable, but how much they matter depends entirely on the specifics of how images are being created, stored, delivered, and viewed. Your particular workflow, audience, and toolchain are what determine whether AVIF is a straightforward win, a careful trade-off, or simply not yet practical for your situation. 🖼️