Convert PNG to JPG
Convert PNG files into much lighter JPG images, ideal for email, websites and forms. Transparency is filled with a white background, and nothing is ever uploaded.
100% private: files are processed in your browser and never uploaded to any server.
How it works
- Drop one or more PNG files into the box above.
- Each image is converted to JPG at high quality; transparency becomes white.
- Download the converted files — they are usually several times smaller.
What you gain and what you give up
PNG stores every pixel exactly as it was, which makes it perfect for screenshots, logos and line art — and wasteful for photographs. A photograph saved as PNG can easily be five to ten times larger than the same picture as a JPEG at a quality nobody would question, because PNG has no way to discard the fine detail your eye ignores. Converting a photographic PNG to JPEG is usually the single largest size reduction available to you.
The trade is that JPEG is lossy and has no transparency. If the image is a photograph, the loss is almost always invisible at sensible quality and the size saving is dramatic. If it is a logo with crisp edges, or a screenshot of text, JPEG is the wrong destination: sharp boundaries are exactly what its compression handles worst, producing faint halos around lettering.
What happens to transparency
JPEG has no alpha channel, so transparent areas cannot survive the conversion. They have to become some actual colour, and the conventional choice is white — which looks correct on a white page and obviously wrong on a dark one, where a transparent logo becomes a white rectangle.
If your image genuinely depends on transparency, converting to JPEG is not the right move: keep the PNG, or use WebP, which offers both real compression and an alpha channel. Convert to JPEG when the image is a photograph, or when transparency is incidental — a screenshot with transparent corners, say — rather than load-bearing.
When the conversion is worth doing
The clearest case is an upload form with a size limit that a PNG cannot meet. The second is a website: photographic PNGs are one of the most common causes of slow pages, and converting them is a one-step improvement with no visible cost. The third is compatibility with systems that only accept JPEG, which is still surprisingly common in older institutional software.
Everything runs in your browser, so a folder of PNGs converts as quickly as your machine can encode them, with nothing uploaded and no limit on batch size.
Good to know
The saving here is often dramatic: a photographic PNG typically drops 60–90% when converted to a high-quality JPG, because PNG cannot use lossy compression and pays full price for every pixel of a photograph.
The trade-off is transparency. JPG has no alpha channel, so any transparent area is filled with white. If you need the transparency, convert to WebP instead, which supports both transparency and lossy compression.
Keep the PNG when the image is a screenshot, a logo or anything with sharp text: those have hard edges, and JPG smudges them. The rule is simple — photographs to JPG, graphics stay PNG.
Frequently asked questions
What happens to transparent backgrounds?
JPG does not support transparency, so transparent pixels are filled with white. If you need to keep transparency, stay with PNG or use WebP.
How much smaller will my file be?
Photographic PNGs typically shrink by 60–90% when converted to JPG at high quality. Graphics with few colors shrink less and may look slightly softer.
Does converting reduce image quality?
JPG is lossy, but at the high quality level this tool uses the difference is invisible for most images. For pixel-perfect graphics, keep PNG.
Is there a file limit?
No. Convert as many PNGs as you want; everything runs on your device.
Will converting back to PNG afterwards restore the quality?
No. Once JPEG has discarded detail it is gone; converting back produces a lossless copy of the degraded image, usually at a larger file size. Keep the PNG original if you might need it.
Can I choose the background colour instead of white?
Transparent areas are filled with white, the convention that matches most documents and forms. If you need a different background, composite it before converting.