Why convert PNG to JPG
PNG files usually reach you from a screenshot, a design app export or an image saved from a website. They are lossless, which is great for editing, but it also makes them large: a photo saved as PNG is often several times the size of the same photo as JPG. That is when upload forms start refusing the file, emails bounce, or a site that only accepts "JPG or JPEG" won't take it at all.
When JPG is the right format — and when it isn't
| What's in the image | Better as | Why |
|---|---|---|
| Photographs, scans of photos | JPG | Much smaller file, no visible difference at high quality |
| Screenshots with text | Usually PNG | JPG can blur letters and may even come out larger |
| Logos and icons with transparency | PNG or WebP | JPG has to fill the transparent background |
| Flat illustrations, charts, diagrams | Usually PNG | Large areas of one colour compress well losslessly |
| Anything a form says must be JPG | JPG | Use Maximum quality if it contains text |
You don't have to guess. Every converted file shows its size before and after, with a percentage badge. A green minus means the JPG is smaller; a plus means it came out larger, which is a strong hint that the image was better off as a PNG.
What happens to transparency
A PNG can have see-through areas — the empty space around a logo, or a soft shadow that fades out. JPG has no way to store that, so each transparent pixel has to become a solid colour. Many converters don't make that decision for you and the background comes out black. Here it is filled with white by default, which matches most documents and web pages. Choose black for dark designs, or pick a custom colour to match the slide, page or banner the image will sit on. Semi-transparent edges are blended with that colour, so anti-aliased outlines stay smooth instead of turning jagged.
If you need to keep the transparency itself, JPG is the wrong target. Switch the output to PNG, WebP or AVIF above — all three keep the background see-through, and WebP and AVIF are much smaller than PNG.
Choosing a quality setting
JPG quality is a trade between file size and detail. High (85%) is the default and is the right choice for most photos. Maximum (95%) is worth it for screenshots, scanned documents and anything with small text, where compression shows first as smudges around edges. Medium (75%) and Small file (60%) help when an upload form has a strict limit; if you need to hit an exact number of kilobytes, the image compressor on this site does that directly.
Convert a whole folder at once
Select or drop as many PNG files as you have. They convert one after another as soon as they are added, and a single ZIP download appears when there is more than one result. Some online converters stop a batch at 20 files because every file costs them server time; this one has no such limit, since the work happens on your own device.
Nothing is uploaded
The PNG is decoded and saved as JPG inside your browser tab. The image is never sent to a server, there is no account to create, and closing the tab removes everything. That matters for screenshots in particular, which often contain messages, account details or other things you would rather not hand to a website.