PNG vs WebP vs AVIF: Which Image Format Should You Use in 2026?

If you've ever opened Chrome DevTools and winced at a 2MB product photo, you've already felt this problem. Image formats have changed a lot in the last few years — and the answer that was correct in 2019 (just use JPEG) is no longer good enough.

This guide breaks down the three formats you'll actually encounter in modern web and app development: PNG, WebP, and AVIF. I'll cover what each one does well, where it falls apart, and how to decide which one to reach for.

The quick version

PNG: Still the right call for UI assets

PNG (Portable Network Graphics) uses lossless compression. That means every pixel you put in is exactly the pixel that comes out. No quality degradation, no colour shifting.

Where PNG wins:

• App icons and logos — especially when you need crisp edges at any scale
• Screenshots with text — lossy compression blurs fine type, PNG keeps it sharp
• Transparent elements — a product cutout on a white background in your e-commerce store
• Anything going into a design pipeline that will be edited again

Where PNG loses:

• Photographs. A full-resolution photo as PNG can be 5–10x larger than the equivalent JPEG. Never use PNG for photography unless you specifically need lossless quality.

The resize consideration: When you resize a PNG, the transparency survives as long as you export back to PNG. Switch to JPEG on export and that transparent background becomes solid white (or whatever your background colour is). Something I made sure to handle explicitly in SnapResizer's export settings — you choose the format, the tool doesn't quietly convert on you.

WebP: The format that should have won earlier

Google developed WebP and released it in 2010. It took about a decade for browser support to become universal, which is why older codebases are still full of JPEGs. By 2026, WebP support is essentially everywhere — iOS Safari included.

The core advantage: WebP can produce files 25–35% smaller than JPEG at comparable visual quality. It also supports transparency, which JPEG cannot. So for many use cases, WebP replaces both.

Where WebP wins:

• Product images in e-commerce — smaller files, faster page loads, better Core Web Vitals
• Blog post images and thumbnails
• Any photograph where you want transparency (rare, but possible — think product cutouts)
• Mobile apps where you're serving images over the network

Where WebP is awkward:

• If you need to support very old browsers (less than 4% of traffic in 2026, but your analytics will tell you)
• Some email clients don't render WebP — stick to JPEG/PNG for email templates
• Some CMS platforms and image pipelines still need configuration to handle WebP

Practical tip: Most modern build tools (Next.js, Astro, Nuxt) will automatically convert and serve WebP via their image components. If you're building with Next.js like I do with SnapResizer, the <Image> component handles this for you.

AVIF: The best quality per byte, with caveats

AVIF (AV1 Image File Format) is the newest of the three and produces genuinely impressive compression. At the same visual quality, AVIF files can be 50% smaller than JPEG and meaningfully smaller than WebP.

Where AVIF wins:

• Hero images and full-screen backgrounds — the size savings are dramatic at large dimensions
• High-quality photography where you want excellent fidelity with minimal file size
• When you're optimising hard for Core Web Vitals (Largest Contentful Paint, specifically)

The real-world caveats:

• AVIF encoding is computationally expensive. Generating AVIF at build time or on-demand can slow your pipeline.
• Browser support hit ~90% in 2025–2026, but that 10% gap matters depending on your audience
• Some image editing tools (including older Photoshop versions) can't open AVIF natively

The right pattern: Serve AVIF to browsers that support it, WebP as a fallback, and JPEG as the base case. With <picture> element or a CDN that handles content negotiation, this is automatic.

<picture>
  <source srcset="image.avif" type="image/avif">
  <source srcset="image.webp" type="image/webp">
  <img src="image.jpg" alt="Product photo">
</picture>

The decision framework

You have a logo, icon, or UI element with sharp edges → PNG

You have a photograph going on a website or app → WebP (or AVIF if your pipeline supports it)

You're optimising a high-traffic page's hero image → AVIF with WebP fallback

You're sending an image via email → JPEG or PNG

You need the file to be editable later → PNG (lossless, no quality degradation across saves)

You have transparency and need web support → WebP (not JPEG, not old-style GIF)

What this means for resizing

Format choice and resize are connected. When you're preparing images for a project:

1. Resize first, convert after. Get the pixel dimensions right before you worry about format. A 1080×1080 WebP and a 1080×1080 JPEG take about the same time to resize — the format decision at export doesn't change the resize operation.

2. Match format to destination. If it's going into an app store, PNG at exact specs. If it's a product thumbnail, WebP. If it's a blog hero that gets heavy traffic, AVIF.

3. Don't double-compress. If you start from a JPEG, resize it, and export as JPEG again, you're compressing an already-compressed image. Start from the highest quality source you have.

SnapResizer lets you resize and choose your export format in the same editor — so you can get to the right dimensions and the right format in one workflow rather than opening multiple tools.

The bottom line

For most web projects in 2026, WebP is your default for photographs and complex images. PNG stays for anything with transparency that needs to stay crisp (UI assets, logos, icons). AVIF is worth adding to high-traffic pages when your pipeline can handle the encoding cost.

The format wars are mostly settled — the question now is whether your tooling is actually serving the right format to the right browser. Check your CDN settings and your framework's image component configuration. The format decision you make in your editor matters less than whether your server is actually delivering it correctly.