JPG vs. PNG: Which Format Should You Use?

JPG and PNG are the two most common image formats on the web, and picking the wrong one is a common, easily avoidable mistake.

The core trade-off

JPG uses lossy compression — it discards some image data to achieve a much smaller file size, which is barely noticeable on photos but adds visible artifacts to sharp edges and text. PNG uses lossless compression — no data is discarded, so quality is perfect, but the file size is typically much larger for photo-like images. PNG also supports transparency; JPG does not.

When to use JPG

Photographs and photo-like images with lots of colors and gradients.
Anywhere file size matters more than pixel-perfect accuracy — most web images, email attachments, general sharing.

When to use PNG

Images that need transparency (logos, icons, overlays).
Graphics with flat colors and sharp edges — screenshots, diagrams, text-heavy images — where JPG's compression artifacts are most visible.
Any case where you need lossless quality, even at a larger file size.

How to convert between them

Have a JPG but need transparency or lossless quality? Use JPG to PNG.
Have a PNG (like a screenshot) but want a smaller file for sharing? Use PNG to JPG — note this fills any transparent areas with a white background, since JPG doesn't support transparency.

A quick way to decide

Ask: does this image need transparency, or is it mostly flat colors and text? If yes to either, use PNG. Otherwise — especially for photos — JPG will usually give you a much smaller file with no visible quality loss.

FAQ

Can I convert a JPG to PNG and get transparency automatically? No — a JPG has no transparency data to begin with, so converting it to PNG just changes the file format; the image stays fully opaque. You'd need to manually remove a background in an image editor to add real transparency.

Will converting PNG to JPG make my file smaller? Usually yes, often significantly, especially for photo-like PNGs — that's the main reason to make the conversion.

Is there a format that gets the best of both? WebP offers both lossy and lossless modes plus transparency support in one format — see our WebP vs. JPG guide for more on that trade-off.

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