Most people never choose between PNG and JPG on purpose. The phone, the screenshot tool or the website decides for them, and the file just lands in your gallery. The difference matters more than you think, because it decides how big the file is and whether a form accepts it.
What JPG is good at
JPG throws away tiny details your eye barely notices, and in return the file becomes very small. That is why photos and anything with lots of colours are almost always JPG. A picture that takes 8 MB as PNG can be under 1 MB as JPG.
What PNG is good at
PNG keeps every pixel exactly as it was and supports a transparent background. It suits logos, screenshots, charts and anything with sharp text. The price is size: PNG files grow fast, especially for photos.
How to choose
Use JPG for photos and for anything you must upload to a form or send on WhatsApp. Use PNG when you need transparency or crisp lines. If a site rejects your PNG for being too large, converting it to JPG is usually the quickest fix, as long as you do not need a see-through background.
A quick test you can do
Take a screenshot and a phone photo, and save both as PNG and as JPG. The photo will be several times larger as PNG with no visible gain, while the screenshot will look crisper as PNG. That small experiment explains the whole topic better than any chart.
Why repeated saving ruins JPGs
Each time you edit and re-save a JPG, a bit more detail is thrown away. After several rounds you notice blocky patches and smeared edges around text. PNG does not suffer from this. So if you plan many edits, work in PNG and export a JPG only at the end.
What about WebP and HEIC?
Newer formats such as WebP and HEIC are smaller still, but they are not accepted everywhere. For anything you share or upload, JPG and PNG remain the safe pair. Use the newer ones only inside apps or websites that clearly support them.
Logos and product pictures
If you sell products, keep your logo as PNG so it sits cleanly on any coloured background, and use JPG for the product photos. Mixing the two in the right places gives you sharp branding and fast-loading pages.
Rules of thumb
Photo of people, places or food: JPG. Logo, icon, diagram or screenshot with text: PNG. Needs a transparent background: PNG. Must be under a size limit: JPG. When two answers seem possible, make both and keep the smaller one that still looks good.
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Open PNG to JPGCommon questions
Does converting PNG to JPG lower quality?
Slightly, because JPG is a lossy format. At a normal quality setting you will not see the difference on a photo, but text and thin lines can look a little softer.
What happens to a transparent background when I convert to JPG?
JPG cannot be transparent, so the empty area is filled with a solid colour, usually white. Check the result if your image is a logo.
Also useful: Image Compressor.
Topics
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