JPG vs PNG: which image format should you use?

The practical difference between JPG and PNG

JPG uses lossy compression. When a JPG is saved, some image information is discarded to reduce file size. At sensible quality settings the visual change can be hard to notice, especially in photographs with gradients, texture and natural detail. Repeatedly opening and re-saving a JPG can gradually introduce artifacts such as blockiness, ringing around sharp edges or loss of fine detail.

PNG uses lossless compression for the image data it stores. The pixels are preserved without the same type of quality loss caused by JPG compression. That makes PNG useful when exact edges, text, flat colour or repeated editing matters. The trade-off is that PNG files can become much larger than JPG files when the source is a photograph or another image with lots of subtle colour variation.

When JPG is the better choice

Use JPG for photographs, camera images, product photos, travel pictures and other scenes containing many colours and smooth tonal changes. A well-compressed JPG can be substantially smaller than an equivalent PNG while still looking good at normal viewing sizes.

JPG also works well when you need a broadly compatible image for email, social platforms, presentations or websites. If the image does not require transparency and does not contain lots of tiny text or very sharp geometric lines, JPG is often the practical default. For web use, start with a high enough quality setting to preserve detail and reduce it only if the file is still larger than you need.

When PNG is the better choice

Use PNG for logos, icons, screenshots, diagrams, interface captures and graphics containing text. These images often include hard edges and flat areas where JPG artifacts are easy to notice. PNG also supports transparency, making it useful for graphics that need to sit cleanly over different backgrounds.

PNG is also a sensible intermediate format when you want to keep a lossless working copy before creating smaller delivery versions. That does not mean every image should be stored as PNG. A full-resolution photograph saved as PNG can consume much more storage and bandwidth than necessary.

Transparency and background removal

A common reason to choose PNG is transparency. If a logo, product cut-out or graphic must have a transparent background, standard JPG is not suitable because JPG does not store an alpha transparency channel. Converting a transparent PNG to JPG requires filling the transparent area with a solid colour, usually white or another chosen background.

If you convert JPG to PNG, the conversion does not automatically create transparency. The result will still contain the original background unless you separately remove it with an image editing or background-removal tool.

What happens when you convert between them

Converting JPG to PNG does not restore detail that was already lost in the JPG. The new PNG can preserve the current pixels without additional JPG-style loss, but it cannot recreate information that is no longer present.

Converting PNG to JPG usually reduces file size, particularly for photographic or complex images, but it removes transparency and introduces lossy compression. This can be a good trade when the destination is a website, email attachment or platform where small files matter more than pixel-perfect preservation.

A simple decision rule

For a photograph with no transparency requirement, choose JPG. For a logo, screenshot, graphic with text or image requiring transparency, choose PNG. For a website, also consider modern delivery formats such as WebP when you want a smaller image while maintaining good visual quality.

QuickConverterLab provides dedicated JPG to PNG and PNG to JPG tools as well as the general image converter. The conversion runs in the browser for supported images, so you can test both versions and compare appearance and file size before deciding which one to keep.

Frequently asked questions