What Is .avifs

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Last updated: April 10, 2026

Quick Answer: AVIF (AV1 Image File Format Standard) is a modern image compression format released in 2019 using technology from the open-source AV1 video codec. Files use the .avif extension and deliver approximately 50% better compression than JPEG while maintaining superior visual quality. As of 2024, AVIF has achieved over 80% browser support across Chrome, Firefox, Safari, and Edge.

Key Facts

AVIF was standardized in 2019 by the Alliance for Open Media, based on the AV1 video codec developed for superior compression efficiency
Achieves approximately 50% smaller file sizes compared to JPEG while maintaining equal or better visual quality at equivalent quality levels
Browser support grew from approximately 15% in 2021 to over 80% globally by 2024, making it increasingly viable for mainstream web use
A typical 150KB JPEG photograph reduces to approximately 75KB when encoded as AVIF without perceptible quality loss
Supports advanced features including lossless and lossy compression, HDR imaging, 8-12 bit color depth, and animated sequences

Overview

AVIF (AV1 Image File Format Standard) is a modern image compression format released in 2019 that leverages technology from the open-source AV1 video codec. Developed by the Alliance for Open Media, AVIF represents a significant advancement in web image optimization, delivering superior compression efficiency compared to established formats like JPEG and WebP. The format achieves approximately 50% better compression ratios, meaning images stored in AVIF are typically half the size of equivalent JPEG files while maintaining or exceeding visual quality.

The rise of AVIF coincides with growing demands for faster web performance and reduced bandwidth consumption across mobile and desktop platforms. As of 2024, AVIF support has expanded to over 80% of web browsers globally, including Chrome, Firefox, Safari, and Edge. Organizations and developers increasingly adopt AVIF for serving images on modern websites, content delivery networks, and media platforms, making it one of the most significant image format innovations in the past decade.

How It Works

AVIF operates by applying advanced compression algorithms derived from the AV1 video coding standard, which was specifically engineered for superior data reduction. Here's how the format functions:

Codec Foundation: AVIF uses the same compression technology as the AV1 video codec, applying video compression principles to still images for dramatically improved efficiency.
Color and Bit-Depth Support: The format supports various color spaces (sRGB, Display P3, Rec. 2100) and bit-depths from 8 to 12 bits, enabling both standard and high-dynamic-range (HDR) image representation.
Lossy and Lossless Compression: AVIF can be encoded using both lossy compression (smaller files, minor quality loss) and lossless compression (preserves all image data) depending on use case requirements.
Progressive Decoding: The format supports progressive image loading, allowing low-quality previews to display quickly while higher-quality data loads in the background.
Animation Support: AVIF supports animated sequences, making it viable for replacing animated GIFs and WebP animations with superior compression efficiency.

Key Comparisons

To understand AVIF's advantages, here's how it compares to other widely-used image formats:

Format	Compression Ratio	Browser Support (2024)	Best Use Cases
AVIF	~50% smaller than JPEG	80%+	Modern web, responsive images, bandwidth optimization
JPEG	Baseline standard	99%+	Legacy compatibility, photographs, universal support
WebP	~25-35% smaller than JPEG	95%+	Good middle ground, broad compatibility, modern browsers
PNG	Larger than JPEG	99%+	Graphics with transparency, lossless requirements

Why It Matters

AVIF's adoption addresses critical challenges in modern web development and digital media distribution. Smaller image files directly translate to faster page load times, reduced bandwidth consumption, and improved user experience—particularly for mobile users on limited data connections. These benefits compound across websites serving millions of images daily, resulting in substantial cost savings for content delivery networks and server infrastructure.

Performance Gains: Websites using AVIF report 20-40% improvements in page load times compared to JPEG-optimized sites, directly impacting user engagement and SEO rankings.
Bandwidth Efficiency: A website serving 10 million images monthly could reduce bandwidth costs by 40-50% by switching to AVIF, representing thousands of dollars in savings.
Environmental Impact: Reduced data transfer requirements mean lower energy consumption across content delivery networks and user devices, contributing to more sustainable web practices.
Future-Proofing: As browser support continues expanding, AVIF positions web properties ahead of the curve, avoiding future format migrations and compatibility issues.

The transition to AVIF represents an important evolution in web standards, balancing quality, compatibility, and performance. While adoption requires modern browser support for optimal coverage, progressive image serving strategies and fallback mechanisms ensure that both legacy and contemporary browsers can access high-quality images efficiently.