JPG vs PNG vs WebP: Which Image Format Should You Use?

Picking the right image format keeps your website fast and your graphics crisp. While JPG and PNG have been web standards for decades, WebP is now supported by every modern web browser.

Here is how each format works, where it shines, and how their file sizes compare on real test images.

When to Use JPG

JPG (or JPEG) is the standard format for digital photography. It uses lossy compression, which removes color details that the human eye struggles to notice.

JPG works best for:

• Digital camera photos and phone pictures
• Complex artwork with continuous color tones and gradients
• Email attachments and photo albums where storage space is limited

Because JPG does not support transparent backgrounds, any transparent areas turn solid white or black when saved. If you have iPhone photos in Apple's newer format, read our guide on what a HEIC file is to learn how it compares to standard JPG.

When to Use PNG

PNG is an uncompressed or losslessly compressed format designed for graphics that require crisp lines.

PNG works best for:

• Company logos and icon graphics with transparent backgrounds
• Screenshots with sharp text, user interfaces, or code snippets
• Medical scans, architectural plans, and charts where data cannot be lost

The downside of PNG is file size. A detailed photograph saved as PNG is often three to six times heavier than the same image saved as a high-quality JPG.

When to Use WebP

Google developed WebP specifically for the modern web. WebP supports both lossy and lossless compression, along with transparent backgrounds and animations.

WebP works best for:

• Website hero images, banners, and article covers
• E-commerce product photos where page speed affects conversion rates
• Replacing heavy transparent PNG icons with lightweight modern assets

Every major browser, including Safari, Chrome, Edge, and Firefox, supports WebP.

Real Benchmark: File Size Comparison

We tested three distinct image types across all three formats. Each image measured 1600×1066 pixels:

As shown in our tests, WebP produced the smallest file across every test category without visible degradation at normal viewing distances.

How to Convert Between Formats

When you need to switch formats for an upload form or design program, you can convert files directly in your browser: