WebP vs JPEG vs PNG — Which Format Should You Use?

Choosing the right image format can cut your page weight by 50% or more. But the "best" format depends on what you're compressing. Here's a no-nonsense breakdown.

Quick comparison

When to use JPEG

JPEG is the go-to for photographs and images with smooth gradients. It handles millions of colors efficiently with lossy compression. At quality 80, most people can't tell the difference from the original.

Use JPEG for: product photos, hero images, blog post images, profile pictures.

Avoid JPEG for: text-heavy screenshots, logos, anything needing transparency.

When to use PNG

PNG uses lossless compression — every pixel is preserved exactly. This makes it ideal for screenshots, diagrams, and logos where sharp edges and text matter. The trade-off is larger file sizes.

Use PNG for: screenshots, UI mockups, logos with transparency, icons, text overlays.

Avoid PNG for: photographs (files will be 5-10x larger than JPEG).

When to use WebP

WebP is Google's modern format that supports both lossy and lossless compression, plus transparency and animation. It typically produces files 25-35% smaller than JPEG at equivalent quality.

Use WebP for: everything, if your audience uses modern browsers. It's supported by Chrome, Firefox, Safari, and Edge.

The only caveat: some older email clients and CMS platforms don't support WebP. In those cases, fall back to JPEG or PNG.

AVIF — the next-generation contender

AVIF (AV1 Image File Format) is the newest format worth paying attention to. Derived from the AV1 video codec, AVIF achieves roughly 50% smaller file sizes than JPEG at comparable visual quality — and about 20% smaller than WebP in most tests. For bandwidth-sensitive sites, those savings add up fast.

Browser support for AVIF has reached approximately 92% globally as of early 2026. Chrome shipped support in version 85 (August 2020), Firefox followed in version 93 (October 2021), and Safari added it in version 16.4 (March 2023). The main gap is older Samsung Internet and Opera Mini users.

The trade-off is encoding speed. AVIF encodes 5-10x slower than WebP at equivalent quality settings. For a build pipeline processing thousands of images, that can add minutes. If you pre-generate images at deploy time this is fine, but on-the-fly AVIF encoding in a CDN can introduce noticeable latency on cache misses. Many teams encode AVIF ahead of time and serve it from a static cache.

Real-world file size comparison

Here's what a typical 1200×800 photograph looks like across all four formats at their standard quality settings:

That's a 12x reduction from PNG to AVIF — with virtually identical visual quality. Even the jump from JPEG to AVIF saves nearly 50%, which translates to measurably faster page loads on mobile connections.

Choosing a format by use case

Rather than picking one format for everything, match the format to the context:

• E-commerce product photos: WebP is the sweet spot. It's 30% smaller than JPEG, supports transparency for cutout shots, and has near-universal browser support. Shopify, WooCommerce, and most CDNs auto-convert to WebP already.
• Blog hero images: Use WebP with an AVIF variant if your build pipeline supports it. Hero images are large and above the fold, so the extra 20% savings from AVIF directly improves Largest Contentful Paint (LCP).
• Logos and icons: PNG for raster logos that need transparency, SVG for vector logos and icons. SVG scales to any resolution with zero quality loss and typically weighs under 5 KB.
• Email attachments and newsletters: Stick with JPEG. Many email clients (Outlook, older Gmail renderers) still don't support WebP or AVIF. JPEG is the only format guaranteed to render everywhere.
• Screenshots and UI mockups: PNG preserves sharp text and UI edges perfectly. If file size is a concern, WebP lossless is about 26% smaller than PNG lossless.

Serving multiple formats with the picture element

You don't have to choose just one format. The HTML <picture> element lets the browser pick the best format it supports, with an automatic fallback:

<picture>
  <source srcset="hero.avif" type="image/avif" />
  <source srcset="hero.webp" type="image/webp" />
  <img src="hero.jpg" alt="Hero image" width="1200" height="800" />
</picture>

The browser evaluates each <source> top to bottom and uses the first format it supports. Browsers that understand AVIF get the smallest file. Those that only support WebP get the next best option. Everything else falls back to the universally supported JPEG in the <img> tag. No JavaScript required — this is pure HTML and works with lazy loading, responsive sizes, and all standard image attributes.

Browser support timeline

Understanding when each format reached broad support helps you decide what's safe to use today:

• JPEG (1992): Supported everywhere since the earliest graphical browsers. Current global support: 100%.
• PNG (1996): Full support since IE 7 (2006) fixed its transparency bugs. Current global support: 100%.
• WebP (2010): Chrome supported it from the start, but it took until Safari 14 (September 2020) for WebP to become truly cross-browser. Current global support: ~96%.
• AVIF (2019): Chrome 85 (August 2020), Firefox 93 (October 2021), Safari 16.4 (March 2023). Current global support: ~92%.

The practical takeaway: WebP is safe as a default for web delivery today. AVIF is safe when served with a WebP or JPEG fallback via the picture element.

Animation: GIF vs WebP vs AVIF

GIF has been the default for short animations since the 1990s, but it's spectacularly inefficient. A 3-second, 480×270 animation typically weighs 3-5 MB as a GIF. The same clip as an animated WebP comes in at 1-1.5 MB — roughly 60-70% smaller — with support for 24-bit color instead of GIF's 256-color palette.

Animated AVIF pushes savings even further, often 80% smaller than GIF with noticeably better color accuracy and smoother gradients. The catch is that animated AVIF encoding is slow and playback support is still inconsistent on some mobile browsers. For most teams, animated WebP is the practical replacement for GIF today, while animated AVIF is worth testing for high-traffic pages where every kilobyte counts.

If your animation is longer than 5 seconds or higher than 720p, consider using an actual video format (MP4 with H.264) instead. A muted, autoplaying video is often 90% smaller than any animated image format and gives you playback controls for free.

The practical recommendation

1. Default to WebP for all web images if your platform supports it.
2. Add AVIF as a progressive enhancement using the picture element for your largest, most impactful images.
3. Use JPEG as a fallback for photos when WebP isn't an option.
4. Use PNG only when you need lossless quality (screenshots, text) or transparency with maximum compatibility.
5. Replace animated GIFs with animated WebP or short muted MP4 videos.
6. Always compress regardless of format — even a WebP at quality 100 is wastefully large.