AVIF vs PNG: Comparing Modern and Classic Lossless
AVIF and PNG seem like formats from different worlds. PNG is the 30-year-old lossless standard that every tool supports. AVIF is the newest contender that promises dramatically smaller files. But both support transparency, both support lossless compression, and both target quality-conscious use cases.
Can AVIF actually replace PNG? For web delivery, often yes. For archival and professional workflows, not yet. Here is where each format wins.
AVIF vs PNG: Head-to-Head Comparison
| Feature | AVIF | PNG |
|---|---|---|
| Lossless file size | Smaller than PNG | Baseline reference |
| Lossy mode | Yes (much smaller files) | Not available |
| Transparency | Full alpha | Full alpha (256 levels) |
| Color depth | 10-bit, 12-bit HDR | Up to 48-bit |
| Browser support (2026) | ~95% | 100% universal |
| Editing software | Growing adoption | Every editor supports it |
| Encoding speed | Slow | Moderate |
| Best for web photos | Yes (lossy mode) | No (files too large) |
| Best for screenshots | Yes (lossless mode) | Yes (universal compat.) |
| Print workflow support | Limited | Widely accepted |
Lossless Compression: Both Can Do It
Both AVIF and PNG support true lossless compression where every pixel is preserved exactly. AVIF lossless typically produces files 20-30% smaller than PNG lossless for photographic content. For screenshots and graphics with large solid-color areas, the advantage varies but AVIF generally wins.
The practical difference is that AVIF also offers a lossy mode. A photograph that might be 2MB as PNG lossless could be 150KB as AVIF lossy with negligible visual difference. PNG has no equivalent option.
Transparency Support
Both formats handle alpha transparency with 256 levels of opacity per pixel. Product cutouts, logos on transparent backgrounds, and overlay graphics work equally well in either format.
AVIF has a unique advantage for transparent images on the web: lossy AVIF with alpha transparency produces much smaller files than PNG. A product photo with a removed background might be 800KB as PNG and 100KB as lossy AVIF with transparent regions perfectly preserved.
The Compatibility Gap
PNG's biggest advantage is universal compatibility. Every browser, every image editor, every operating system, every email client, and every printer driver supports PNG. There is no scenario where a PNG file will not open.
AVIF support is at approximately 95% for web browsers and growing for desktop software. Adobe Photoshop, GIMP, and most modern editors support AVIF, but some specialized tools, older software, and enterprise systems may not. For maximum compatibility, PNG remains the safer choice.
Web Performance: AVIF Wins Decisively
For web delivery, AVIF's size advantage is transformative. A page with 10 PNG images totaling 5MB could use lossy AVIF at 800KB total. Even lossless AVIF would be 3.5-4MB. Faster page loads, better Core Web Vitals scores, and lower bandwidth costs.
If you are optimizing a website's image pipeline, switching from PNG to AVIF (lossy for photos, lossless for screenshots) is one of the highest-impact changes you can make.
When PNG Still Wins
PNG remains the better choice when universal compatibility is required, such as email attachments, legacy system integration, or print workflows. PNG is also preferred for source files in design projects because every tool supports it and re-saving never degrades quality.
For indexed-color graphics (icons, simple logos with few colors), PNG-8 produces very small files that may match or beat AVIF lossless for the simplest images. The overhead of AVIF's more complex codec can be counterproductive for tiny, simple graphics.
Frequently Asked Questions
Is AVIF lossless better than PNG?
AVIF lossless typically produces files 20-30% smaller than PNG for the same image content. Both preserve every pixel exactly. AVIF wins on file size; PNG wins on compatibility and tooling support.
Can AVIF replace PNG for transparency?
For web delivery, yes. AVIF handles alpha transparency well and produces much smaller files. For archival, email, and contexts where universal compatibility matters, PNG remains more reliable.
Which format loads faster on websites?
AVIF loads faster because the files are significantly smaller. Even with slightly slower decoding than PNG, the reduced download time more than compensates on typical network connections.