Technical Evaluation Guide for Replacing JPG with AVIF: From Compression Ratio to Production Pipeline
At the same SSIM image quality, AVIF file sizes are 30% to 50% smaller than JPG. This article analyzes the feasibility of replacement from dimensions including coding technology and compatibility.
Bijgewerkt 2026-08-11
Generational Gap in Coding Technology: DCT vs AV1 Intra Coding
The JPEG standard released in 1992 uses block-based discrete cosine transform (DCT) coding, which performs independent transform coding on 8x8 pixel blocks. Block-based compression easily produces blocking artifacts, and only supports 8-bit color depth.
AV1 intra coding released in 2018 uses technologies such as multi-directional prediction, recursive partitioning, and in-loop filtering. It can adjust the size of coding blocks according to the local texture of the image, eliminate blocking effects, and the compression model is more adapted to the content characteristics of modern images.
Comparison of Compression Ratio and Color Depth Support at the Same Image Quality
According to public test data from Google, at the same SSIM image quality, AVIF file sizes are 30% to 50% smaller than JPG. Test data from domestic CDN vendors shows that this range is basically consistent for web image scenarios.
JPG only supports 8-bit SDR color, with a maximum display of 256 gray levels. AVIF natively supports 10-bit and 12-bit color depth, can cover the BT.2020 color gamut, and adapts to HDR display devices.
| Image Quality Metric (SSIM) | Average JPG Size (KB) | Average AVIF Size (KB) | Size Reduction Ratio |
|---|---|---|---|
| 0.98 (High Quality) | 182 | 91 | 50% |
| 0.95 (Good Quality) | 113 | 63 | 44% |
| 0.92 (Fair Quality) | 78 | 46 | 41% |
Impact of Coding Time on Build Pipeline
The coding time for a single AVIF image is about 10 to 20 times that of JPG at the same image quality. The single-threaded coding speed of libaom, the AOM official reference encoder, is much lower than that of libjpeg-turbo.
Existing production pipelines can reduce the impact of coding time through offline pre-coding, distributed coding clusters, or using speed-optimized encoders such as SVT-AV1. Replacement is not recommended for real-time online coding scenarios for the time being.
Building the pipeline only requires adding a new AVIF coding output branch, no need to delete the original JPG output link. Smooth transition can be achieved with a fallback solution.
Browser Support and Fallback Implementation
As of the second quarter of 2024, Chrome, Firefox, Edge, and Safari 16 and above on global desktops all natively support the AVIF format, with a coverage rate of over 92%. On mobile, the coverage rate of Android browsers exceeds 90%.
Fallback compatibility is implemented using the HTML picture tag: AVIF is loaded first, and browsers that do not support AVIF will automatically fall back to JPG format. This only requires adjustments to the structure of front-end img tags.
Veelgestelde vragen
Can existing sites fully replace JPG with AVIF?
Full replacement is not recommended for the time being. If the existing production pipeline cannot accommodate the AVIF coding time, and about 8% of users still use old browsers that do not support AVIF, a gradual replacement方案 is recommended.
Do I need to batch convert existing JPG to AVIF?
Above-the-fold images that account for a high proportion of traffic can be converted first. You can use an AVIF to JPG converter for reverse verification. Low-traffic long-tail images do not need batch conversion, and can remain in their original format.
Is AVIF more suitable than WebP for replacing JPG?
At the same image quality, AVIF has a 10% to 20% higher compression ratio than WebP, supports higher color depth, and has slightly lower compatibility than WebP. New sites can prioritize AVIF as their main image format.