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PNG (Portable Network Graphics) has been the go-to format for transparent-background web images since 1996. AVIF, the newest generation image format, significantly outperforms PNG in compression efficiency and color support—but it’s still in a compatibility transition period. This guide compares every key dimension so you know when to choose AVIF and when to stick with PNG.
Transparency is PNG’s hallmark strength. It supports full 8-bit and 16-bit alpha channels with precise semi-transparency handling—essential for UI elements, logos, stickers, and any asset requiring a transparent background. AVIF also supports alpha-channel transparency, and handles semi-transparent regions well even in lossy mode, achieving near-PNG quality at substantially smaller file sizes.
PNG uses lossless DEFLATE compression, which preserves every pixel perfectly but produces relatively large files. A transparent-background icon might weigh 30–200 KB as PNG. AVIF lossless is around 20–30% smaller than PNG; AVIF lossy can reduce file size dramatically more while remaining visually indistinguishable. For web images where pixel-perfect lossless output isn’t required, AVIF lossy crushes PNG on efficiency.
PNG supports up to 16-bit lossless color, making it a common intermediate format in professional photography workflows. AVIF supports 10-bit and 12-bit color with native HDR and Wide Color Gamut support. While AVIF’s maximum bit depth is slightly lower than PNG, its HDR capability makes it better suited for next-generation display content.
PNG works in every browser, OS, and image editor without exception. AVIF is supported in Chrome 85+, Firefox 93+, and Safari 16+, covering roughly 85–90% of global traffic. Using an HTML <picture> element to serve AVIF with a PNG fallback gives you the efficiency gains of AVIF without sacrificing universal access.
PNG is best for: pixel-perfect screenshots and charts, intermediate storage in design workflows, assets that need to open in any software, and simple flat-color icons. AVIF is best for: transparent-background product photos on modern web pages, UI assets where you can tolerate slight quality tradeoffs for smaller file sizes, and CDN workflows with automatic format negotiation.
| Feature | PNG | AVIF |
|---|---|---|
| Transparency | Full alpha channel | Full alpha channel |
| Compression type | Lossless only | Lossless and lossy |
| Compression efficiency | Moderate | Excellent (lossless 20–30% smaller; lossy much more) |
| Max color depth | 16-bit | 12-bit |
| HDR support | Limited | Full HDR + Wide Color Gamut |
| Browser support | 100% | ~85–90% |
| Animation | APNG (limited) | Yes |
| Best for | Design assets, screenshots, UI elements | Modern web images, transparent product photos |
AVIF beats PNG on compression efficiency and modern features, but it cannot fully replace PNG yet. When you need lossless pixel-perfect output or universal compatibility, PNG remains the safe choice. For performance-focused modern websites, serving AVIF with a PNG fallback is the optimal strategy—you get the speed benefits for the majority of users without leaving anyone behind.
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