Is PNG or JPG better?

Neither is universally better; they suit different content. JPG is better for photographs because it compresses them far smaller, while PNG is better for logos, icons, text, and anything needing transparency because it stays perfectly sharp.

Why is my PNG so much bigger than a JPG?

PNG uses lossless compression and keeps every pixel, which is great for graphics but inefficient for photographs. A photo saved as PNG can be several times larger than the same image as JPG with no visible benefit.

Can JPG have a transparent background?

No. JPG does not support transparency and always fills the background with a solid colour. If you need part of the image to be see-through, use PNG or WebP instead.

Which format should I use for a logo?

Use PNG for logos. It keeps sharp edges crisp and supports transparency so the logo sits cleanly on any background, whereas JPG would add fuzzy artefacts around the edges and could not be transparent.

PNG vs JPG: Which to Use? | tinyimgcompress

PNG and JPG are the two most common image formats on the web, and choosing between them confuses a lot of people. They look similar in a file browser, but under the hood they work in completely different ways. Pick the wrong one and you either bloat your files needlessly or lose quality you cannot get back. Pick the right one and your images stay sharp, small, and fast.

This guide cuts through the jargon and gives you a simple mental model for deciding every time. We will look at how each format stores an image, where each one shines, and the handful of rules that cover almost every real situation. Along the way you can put the advice into practice with the friendly tools at tinyimgcompress, whichever format you land on.

How JPG Works

JPG, also written JPEG, was designed for photographs. It uses lossy compression, which means it deliberately discards detail the human eye barely notices in order to make files dramatically smaller. A photo saved as JPG can be a fraction of the size of the same image in other formats while looking essentially identical on screen.

The trade-off is that JPG does not handle sharp edges or flat areas of solid colour well. Text, logos, and line art can develop fuzzy halos called artefacts because the compression smooths things it should leave crisp. JPG also cannot store transparency, so it always fills the background with a solid colour. For continuous-tone photographs, though, it is superb and supported absolutely everywhere.

How PNG Works

PNG takes the opposite approach. It uses lossless compression, so every pixel is preserved exactly as it was. Nothing is thrown away, which makes it perfect for images where precision matters: logos, icons, screenshots of text, diagrams, and anything with crisp edges. PNG also supports full transparency, letting parts of an image be see-through so it can sit cleanly over any background.

The cost of that perfection is size. Because PNG keeps every detail, a photograph saved as PNG can be several times larger than the same photo as JPG, with no visible benefit. PNG files can still be optimised losslessly to strip overhead, which our guide on how to reduce PNG file size explains in detail, but they will never match JPG on a complex photo.

There is one more PNG strength worth knowing about: it supports varying levels of transparency, not just fully opaque or fully invisible. This is called alpha transparency, and it allows soft shadows, glows, and feathered edges that blend smoothly into whatever sits behind the image. JPG cannot do any of this, which is why designers reach for PNG whenever an element needs to float convincingly over a coloured or patterned background. For a watermark, a product cut-out, or a logo with a soft shadow, that capability is decisive and no amount of JPG quality can substitute for it.

The Simple Rule for Choosing

Once you understand how each format behaves, the decision becomes easy. Here is the rule that covers the vast majority of cases.

Use JPG for photographs and any image with lots of colours and smooth gradients, such as scenery, portraits, or product shots without transparency.
Use PNG for graphics with flat colour, sharp edges, or text, such as logos, icons, charts, and screenshots, and for anything that needs transparency.

If you remember nothing else, remember photo equals JPG, graphic equals PNG. That single distinction will steer you correctly almost every time. For a broader look at how the newer formats fit in, our article on the best image format for the web rounds out the picture.

Side-by-Side Comparison

Here is how the two formats stack up across the qualities that matter most.

Compression type: JPG is lossy; PNG is lossless.
Best for: JPG suits photos; PNG suits graphics and text.
Transparency: JPG cannot do it; PNG supports it fully.
File size on photos: JPG is far smaller; PNG is bloated.
File size on flat graphics: PNG is efficient; JPG can look fuzzy and is not always smaller.
Editing repeatedly: PNG stays perfect; JPG loses a little quality each save.

Notice that neither format is simply better. They are tools for different jobs, and a good workflow uses both where each fits. A single web page often contains both at once: photographic banners and product shots saved as JPG, alongside a transparent logo, a set of icons, and a few screenshots saved as PNG. Mixing them deliberately, rather than forcing everything into one format, is what keeps a page both light and crisp.

It also helps to think about how the image will be edited in future. Because JPG is lossy, every time you open a JPG, make a change, and save it again, the format throws away a little more detail. PNG does not suffer this, since it is lossless, so it makes a far better working format while you are still adjusting a graphic. A common professional pattern is to keep the editable master as a PNG or a layered design file and only export a compressed JPG at the very end, when the image is final and headed for the web.

How to Pick and Optimise: Step by Step

Here is a quick process to choose the right format and then make the file as small as it can be.

Identify the content. Is it a photograph, or a graphic with flat colour and edges? Does it need transparency?
Choose the format. Photo to JPG, graphic or transparent image to PNG.
Resize to display dimensions. Use the resize tool so you are not storing pixels the page will never show.
Compress accordingly. Run photos through the image compressor at around 80 percent quality, and run graphics through the PNG compressor for lossless savings.
Consider WebP. If you control the site, the WebP converter can often beat both for size while keeping transparency.

This sequence guarantees you start from the right format and then squeeze it as far as it sensibly goes.

Common Mistakes With Format Choice

Saving photos as PNG. The most common and costly mistake, bloating files several times over for zero visible gain.
Saving logos and text as JPG. This introduces fuzzy artefacts around crisp edges that PNG would keep sharp.
Re-saving a JPG many times. Each lossy save degrades it a little further. Keep an original and export once.
Forgetting transparency needs. If part of the image must be see-through, JPG is simply not an option.

Steering clear of these four traps puts you ahead of most people who choose a format by habit rather than by what the image needs. If you do find yourself with a heavy photographic PNG, the fix is to convert it; our guide on how to compress images without quality loss shows how to do that gently.

Conclusion

PNG and JPG are not rivals so much as specialists. JPG compresses photographs beautifully and keeps files small, while PNG preserves graphics, text, and transparency perfectly. Match the format to the content, resize to display size, and compress, and your images will always be as small and sharp as they can be. Put it into practice now by dropping a photo into the image compressor and seeing how small a well-chosen JPG can get.

PNG vs JPG: Which Image Format Should You Use?