WebP vs PNG vs JPEG — which format and when

The format you choose for your images can cut page weight in half — or double it. Here is a straightforward comparison with real numbers, not theory.

Quick answer

Use WebP for photographs on websites. Use JPEG for email and social media. Use PNG for screenshots, logos, and anything that needs pixel-perfect sharpness or transparency with maximum compatibility. Use SVG for simple vector graphics.

Real file size comparison

Here is what happens when you save the same 4000x3000 photograph in each format. The source image is a landscape photo with natural colours, fine detail, and a gradient sky — typical of real-world use.

The difference is dramatic. WebP at quality 75 produces a visually identical image to JPEG at quality 82, but at 61% less file size. For a website serving 50,000 page views per month with 5 images per page, switching from JPEG to WebP saves approximately 170 GB of bandwidth per month.

JPEG: the universal standard

JPEG has been the default photograph format since 1992. Every device, every app, every platform supports it. This universality is its greatest strength. When you send a JPEG to someone — via email, messaging, AirDrop, USB — you know it will open.

JPEG uses lossy compression: it discards visual data the human eye cannot easily perceive. At quality 65-82%, the loss is invisible in photographs at normal viewing sizes. The compression is most efficient on photographs with smooth gradients and natural textures. It struggles with sharp edges, text, and flat-colour graphics — these develop visible "artifacts" (blocky, smudgy areas).

Best for: photographs for email, social media, documents, presentations, and any situation where universal compatibility matters.

Avoid for: logos, text overlays, screenshots, technical diagrams — anything with sharp edges. No transparency support.

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PNG: lossless quality and transparency

PNG uses lossless compression — every pixel is preserved exactly. No compression artifacts, no quality degradation over repeated saves. PNG also supports alpha transparency, making it essential for logos, icons, and any graphic that needs to sit on different backgrounds.

The tradeoff is file size. PNG photographs are 5-10x larger than JPEG equivalents. This is acceptable for design work and editing workflows, but wasteful for web delivery of photographs. For screenshots, text-heavy images, and graphics with large areas of flat colour, PNG actually compresses quite well.

Best for: screenshots, technical diagrams, logos, icons, text overlays, images that will be edited multiple times, design assets that need transparency.

Avoid for: photographs on websites (use WebP), email attachments where file size matters.

Compress PNG images with MiniPx →

WebP: the best of both worlds

WebP was created by Google in 2010 and has been gaining adoption steadily. In 2026, over 97% of browsers support WebP (source: caniuse.com). It supports both lossy and lossless compression, plus alpha transparency. At equivalent visual quality, WebP produces files 25-35% smaller than JPEG and 26% smaller than PNG.

For websites, WebP is now the clear default choice. WordPress supports it natively since 5.8. Shopify, Squarespace, and most modern CMSes accept WebP uploads. The only holdouts are some email clients, older social media upload forms, and legacy enterprise software.

Best for: website images (photographs, product photos, blog images, hero banners), any web content where file size matters.

Avoid for: email attachments (some clients do not support it), social media uploads (most platforms do not accept WebP), print production.

Compress WebP images with MiniPx →

Browser support in 2026

What about AVIF?

AVIF (AV1 Image File Format) offers even better compression than WebP — roughly 20% smaller at similar visual quality. It supports transparency and HDR. But browser support is ~92% globally in 2026, and encoding is slower than WebP. For most websites, WebP remains the practical choice. AVIF is worth adopting for sites with Chrome/Firefox-dominant audiences and progressive enhancement setups.

Decision tree: which format to use

Is it a photograph or complex image?

→ For website: WebP

→ For email / social / documents: JPEG

Is it a logo, icon, or graphic with transparency?

→ For website: WebP (or PNG for max compatibility)

→ For design / editing: PNG

Is it a screenshot or text-heavy graphic?

→ PNG (lossless preserves text sharpness)

Is it a simple vector graphic (logo, icon, illustration)?

→ SVG (resolution-independent, smallest file size)

Convert between formats with MiniPx

MiniPx converts between all three formats in your browser — no upload, no signup, no limits. Select your files, choose the output format, compress, and download. Supports batch conversion for entire image libraries.

PNG to JPG · JPG to WebP · PNG to WebP · WebP to JPG · WebP to PNG · JPG to PNG · SVG to PNG · BMP to JPG

Frequently asked questions

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