JPEG vs PNG: Understanding the difference.

Lossless vs. lossy compression.

It’s important to understand the different compression processes each file type uses when considering whether to use JPEG or PNG as your file type.

JPEGs are designed to efficiently store high-quality digital photos packed with detail and colour. They compress large images into much smaller file sizes, making them easier to share and upload online. But this comes at a price.

JPEGs use a lossy compression process — meaning some data from the image is permanently deleted when it’s made smaller. This could compromise the quality of your file in the long term because each time you edit and save it, you lose more data. Because of this, some professional photographers prefer using uncompressed raw files.

In contrast, PNG files benefit from lossless compression. This means no data is lost when the image is compressed — the quality stays the same no matter how many times you edit and save the file. The image won’t become blurry or distorted, making PNGs ideal for sharp logos and graphs containing lots of figures.

In summary:

- JPEG = lossy compression → smaller size, reduced quality

- PNG = lossless compression → larger size, preserved quality

This core difference between JPG and PNG affects performance, editing, and image integrity across different use cases.

File sizes.

They may compromise on quality with their lossy compression, but JPEGs can crunch large images down into more manageable file sizes. This is helpful if you don’t have a huge amount of disc space to play with — and can speed up page loading times, too.

The trade-off with PNGs is that their lossless compression creates bigger files, since they retain much more information. They’re generally larger than JPEGs and GIFs, use up additional storage space and potentially slow down the responsiveness of web pages.

When choosing between PNG vs JPG, consider whether smaller size or higher image fidelity is more important for your project.

Transparency.

One of the major differences between JPEG and PNG files is their ability to handle transparency in images.

JPEGs don’t support transparent backgrounds. Non-rectangular logos and graphics featuring lots of text are unlikely to work well in this format as a result. JPEG images will also struggle to blend seamlessly with web pages that feature different background colours.

PNG files, on the other hand, do support transparency. Web designers can apply transparent backgrounds to their images - and even different degrees of transparency. It means PNG images integrate better with different background colours on a page and text is easier to read.

This transparency support is a key difference between PNG and JPG files — especially for design-heavy formats like logos, icons, and overlays.

Digital photos vs. web graphics.

JPEGs are hugely popular with photographers and businesses that manage large image libraries. Their smaller file size allows multiple digital photos to be shared and downloaded simultaneously. By making efficient use of storage space, JPEGs can keep an image library relatively streamlined, with no long wait times for files to open.

Given their widespread usage, JPEG files are viewable and editable across a vast array of operating systems and programs — so you’re unlikely to need specialised software to work on them.

In comparison, PNGs aren’t really built to store high-quality photos. They specialise in handling detailed, high-contrast web graphics. They’re often the default format for screenshot images since they can provide a highly accurate representation of your desktop and don’t compress pixels together. A huge colour palette and lossless compression ensure that they retain plenty of detail — making them a popular choice for illustrations and charts.

The ability of PNGs to handle transparent images also gives them an edge over JPEGs when designing logos. For example, you can create a company logo with a transparent background, then seamlessly layer it on top of other images or webpages.

As with JPEGs, you can open PNGs in many programmes and web browsers. PNGs were specifically designed to be an upgrade on the older GIF format — meaning they’re patent-free and offer a much broader choice of colours.

To summarise:

- Use JPEG for digital photos, photo storage, and web sharing

- Use PNG for transparency, illustrations, and screenshots

The choice between JPEG vs PNG depends on whether image quality, compression, or design flexibility is your top priority.

Use JPEG when:

• You’re working with full-colour photographs or realistic images with gradients and complex shading
• You need to compress images for faster loading on webpages or sharing over email and messaging platforms
• You’re storing large volumes of images and want to save disk space without noticeable loss in quality
• You need to include EXIF data such as camera settings or GPS information
• You’re preparing images for print, especially photographic content

Use PNG when:

• You’re working with graphics that require transparency, such as logos, icons, and overlays
• You want crisp, lossless image quality for detailed line art, charts, UI elements, or text-heavy graphics
• You’re saving screenshots, scanned documents, or digital illustrations where accuracy is important
• You’re designing for the web and need clear image edges and sharp contrasts
• You need to preserve image quality through multiple edits and saves, with no degradation over time

In short, JPEG is ideal for full-colour photos where reduced file size is key, while PNG is best for graphics that require sharpness, transparency, or repeated editing. Both formats have their strengths, and choosing the right one depends on the visual content and how it will be used.