JPG vs PNG: use the format that matches the image.

The short answer

Use JPG for photographs and other continuous-tone images when smaller files and broad compatibility matter. Use PNG for screenshots, interface graphics, logos, diagrams, text-heavy images, and anything that needs transparency or lossless storage.

The choice is not about which format is universally higher quality. It is about whether the image benefits from lossy photographic compression or needs every pixel edge preserved exactly.

Why JPG is usually smaller for photos

JPG uses lossy compression. Instead of storing every pixel exactly, it simplifies visual information in ways designed to be less noticeable to the human eye. This works especially well for photographs, where neighboring pixels often contain gradual changes in color and brightness.

The trade-off is that some information is discarded. At sensible quality settings, the difference may be difficult to notice. At aggressive compression levels, you can see blockiness, ringing around edges, banding, or smeared texture. Re-saving the same JPG repeatedly can compound those artifacts because each new lossy encoding works from an already compressed image.

Why PNG is better for screenshots and graphics

PNG is lossless. When an image is encoded and decoded as PNG, the stored pixel values are preserved rather than approximated. That makes it useful for screenshots, icons, line art, charts, UI captures, and images containing small text or sharp color boundaries.

PNG also supports an alpha channel for transparency. That is important for logos, overlays, stickers, interface assets, and other graphics that need to sit cleanly on different backgrounds. Standard JPG does not preserve transparency; transparent areas must be flattened against a color when converting to JPG.

When converting PNG to JPG makes sense

PNG-to-JPG conversion is useful when a PNG is actually photographic content and the file is much larger than necessary, or when a service only accepts JPG uploads. A screenshot or transparent logo usually gains little from this conversion and may lose useful properties.

Before converting a transparent PNG to JPG, decide what background color should replace transparency. If a converter simply flattens the image, the result may use a default background that does not match your intended design.

When converting JPG to PNG makes sense

Converting JPG to PNG does not restore quality that was already lost to JPG compression. The new PNG can prevent additional lossy recompression during later edits, but it cannot reconstruct missing detail.

JPG-to-PNG can still be practical when a design tool or workflow expects PNG, when you plan to add transparency after editing, or when you want subsequent saves to remain lossless. Just expect the PNG file to be larger than the original JPG in many cases.

Which should you use for websites?

For general websites, JPG is still a dependable option for photos and PNG remains useful for transparency and pixel-sharp graphics. However, modern formats such as WebP and AVIF can often reduce file size further. The right web strategy depends on browser support, your image pipeline, fallback requirements, and how much complexity you want to manage.

A simple decision checklist

• Photograph: JPG is usually the simpler choice.
• Screenshot or UI image: PNG is usually better.
• Needs transparency: choose PNG rather than JPG.
• Needs repeated lossless editing: keep a lossless master such as PNG where appropriate.
• Uploading to a service that requires JPG: convert a copy and preserve the original.