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

Choosing the right image format can cut your file size in half — or double it. WebP, JPEG, and PNG each have strengths, and picking the wrong one means wasted bandwidth, slower pages, and unnecessarily large files. Here's a practical guide to when each format makes sense.

Quick comparison

JPEG: the photo workhorse

JPEG has been the default image format since 1992. It uses lossy compression — meaning it discards some visual data to reduce file size. For photographs, this works well because the human eye doesn't notice the removed detail at reasonable quality levels (70-85%).

Use JPEG when:

• You're working with photographs or complex images with many colors
• You need maximum compatibility (email clients, old CMS platforms)
• Transparency is not needed

Avoid JPEG when:

• Your image has text, sharp lines, or flat colors — JPEG creates visible artifacts around hard edges
• You need a transparent background
• You're re-saving the same file multiple times (quality degrades with each save)

PNG: pixel-perfect graphics

PNG uses lossless compression — it preserves every pixel exactly. This makes it ideal for images where precision matters: logos, icons, screenshots, diagrams, and anything with text or sharp edges.

Use PNG when:

• You need transparency (alpha channel)
• Your image has text, lines, or flat colors
• You need lossless quality — no compression artifacts
• Screenshots and UI mockups

Avoid PNG when:

• The image is a photograph — file sizes will be 5-10x larger than JPEG for no visible benefit
• File size matters and WebP is an option

WebP: the best default for web in 2026

WebP was developed by Google and released in 2010. It supports both lossy and lossless compression, transparency, and animation — combining the best features of JPEG and PNG in a single format. At the same visual quality, WebP files are typically 25-35% smaller than JPEG and up to 26% smaller than PNG.

In 2026, WebP is supported by over 97% of browsers worldwide, including Chrome, Firefox, Safari, Edge, and all major mobile browsers. The "browser support" argument against WebP no longer holds.

Use WebP when:

• You're publishing images on the web — it's the best general-purpose format
• You want the smallest file size without visible quality loss
• You need transparency with smaller file sizes than PNG
• You're optimizing page speed and Core Web Vitals

Avoid WebP when:

• You're sending images via email to recipients who may use very old software
• You need to print the image (use TIFF or high-quality JPEG instead)
• A specific platform explicitly requires JPEG or PNG

How to convert between formats

The easiest way to convert images to WebP is with a browser-based tool. Crunch's WebP converter converts JPEG, PNG, and other formats to WebP entirely in your browser. No upload, no server — your files stay private.

You can also compress your images before converting to squeeze out even more savings. And if your images contain sensitive EXIF metadata, strip it before sharing.