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

The Three Pillars of Web Images

Every image you see on the web is encoded in a specific format, and each format was designed to solve a different problem. JPEG, PNG, and WebP are the three formats that power the vast majority of images online today. Choosing the right one for each situation can dramatically reduce your page load times and bandwidth costs while maintaining visual quality.

JPEG: The Everyday Champion

JPEG (Joint Photographic Experts Group) has been the default format for photographs and complex images since 1992. It uses lossy compression, which means it permanently discards some image data to achieve smaller file sizes. For photographs, this trade-off is excellent — the human eye barely notices the difference between a high-quality JPEG and an uncompressed original, even though the file might be 90% smaller.

JPEG excels at photographs, gradients, and images with millions of colors. It does not support transparency, which means any transparent areas become solid (usually white or black). It also struggles with sharp edges, text, and flat-color graphics — these tend to develop visible artifacts called "ringing" around hard boundaries.

A high-quality JPEG at 80-85% quality is the sweet spot for most photographs. Below 60%, artifacts become noticeable. Above 90%, the quality improvement is negligible but file sizes increase significantly.

PNG: Pixel-Perfect Precision

PNG (Portable Network Graphics) was created in the mid-1990s as a patent-free replacement for GIF. It uses lossless compression, which means every single pixel is preserved exactly as it was in the original. This makes PNG ideal for screenshots, logos, icons, text overlays, and any image where precise edges matter.

PNG supports full alpha transparency, which means you can have partially transparent pixels — essential for logos and UI elements that need to sit on top of different backgrounds. PNG files also support a wider color depth, including 8-bit indexed color (similar to GIF) and full 24-bit or 32-bit color with transparency.

The downside is file size. A photograph saved as PNG will be three to ten times larger than the same image saved as a high-quality JPEG. This is the cost of lossless compression on complex imagery. For simple graphics with large areas of flat color, PNG actually compresses very efficiently.

WebP: The Modern Contender

WebP was developed by Google and released in 2010. It supports both lossy and lossless compression, plus transparency and even animation. In lossy mode, WebP typically achieves 25-34% smaller files than JPEG at the same visual quality. In lossless mode, it beats PNG by about 26%.

Browser support for WebP is now universal — all major browsers have supported it since 2020. The remaining concern is ecosystem support: some email clients, older image editors, and certain content management systems may not handle WebP natively. But for the web specifically, WebP is a strong default choice.

WebP does have a maximum resolution of 16,383 x 16,383 pixels, which is rarely a practical limitation. It also does not support progressive loading the way JPEG does, though this matters less with modern connection speeds.

When to Use Each Format

Use JPEG for photographs and complex images where file size matters more than pixel-perfect accuracy. Use PNG for screenshots, logos, icons, and any image with text or sharp edges that need to remain crisp. Use WebP when you need the smallest possible file size and your delivery platform supports it — which for the web is essentially everywhere.

For a compression tool like TinImg, the best approach is to try multiple formats and compare the results. A photograph might compress best as WebP, while a screenshot with text might actually be smaller as a well-optimized PNG than as a lossy WebP.