Image Formats: WebP vs AVIF vs JPG vs PNG

If you're building a website in 2026, you've got more image format options than ever. WebP is mature, AVIF is gaining ground, and good old JPG still works fine. The question is which one to actually use.

The Contenders

WebP

Google's format has been around for over a decade now and it's the default recommendation for most sites. It supports lossy and lossless compression, transparency, and even animation. Files are typically 25-35% smaller than equivalent JPGs.

AVIF

The newer format based on the AV1 video codec. It compresses even better than WebP — about 20% smaller in many cases. The downside is that encoding is slower, and some editing tools don't support it yet.

JPG

The old reliable. Every device, every browser, every image editor supports JPG. It's not the most efficient format, but it's the most compatible. Use it as a fallback.

PNG

Still the best choice for graphics with transparency, screenshots, and anything with text. But for photos, PNG files are way too large for web use.

File Size Comparison

• Uncompressed: 6 MB
• JPG (quality 85): 300 KB
• WebP (quality 85): 200 KB
• AVIF (quality 85): 160 KB
• PNG: 2.5 MB

Recommendation for 2026

• Primary format: WebP — best balance of compression, quality, and support
• Fallback: JPG (for photos) or PNG (for graphics with transparency)
• Future-proof: Start testing AVIF for new content

Use the element in HTML to serve WebP with JPG or PNG fallbacks.

How to Convert

Converting images between formats is easy with the image converter. You can also resize and compress in the same step for fully optimized images.

The Bottom Line

WebP is the practical choice for most sites in 2026. It saves bandwidth, loads fast, and works everywhere your users are. Use JPG as a fallback for older browsers, and you\'re covered.

Why the Numbers Add Up

The size differences are not magic; they come from how each format encodes. JPG uses a block-based transform that works well on photos but shows artifacts on sharp edges. WebP borrows ideas from video compression, predicting what each block looks like from its neighbors and storing only the difference. AVIF goes further with the AV1 codec and larger prediction blocks. PNG stores every pixel exactly, which is why it excels at flat graphics and stays heavy for photos. Choosing a format is really choosing how much prediction and approximation you are willing to trade for bytes.

Common Mistakes When Choosing Formats

• Converting back and forth: Every lossy pass costs quality. Go from the original straight to the final format in one conversion.
• Serving one format to everyone: A single format ignores that some users are on older browsers. The picture element with a fallback costs nothing and covers everyone.
• Forgetting transparency needs: JPG has none. Graphics with transparency need PNG or WebP, and WebP does it at a fraction of the size.
• Optimizing before resizing: Compressing a 4000px image that displays at 800px wastes effort. Resize first with the image resizer, then convert and compress.

A Practical Conversion Strategy

You do not need to convert a whole site in one night. Start with the images that cost the most: hero banners, product photos, and above-the-fold graphics. Convert those to WebP, keep a JPG fallback, and measure the page weight before and after. Most sites see double-digit percentage savings from the top ten images alone. From there, work through galleries and blog images when time allows. Every converted image keeps working in every browser, and the only thing users notice is that pages load faster.