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Use the fields in the tool above and keep units and formats consistent.
Turn heavy PNG images into lighter JPGs for email, forms and websites. Choose a fill colour for transparent areas and set quality to balance size with detail.
Take a 1920 x 1080 product photo saved as PNG. It might weigh around 4 MB. Saved as JPG at quality 85, the same picture often drops to a few hundred kilobytes. Most viewers would struggle to spot the difference. That gap explains why a PNG to JPG converter is such a quick fix for slow pages and bounced attachments.
JPG gets there through lossy compression. It discards fine colour detail that people rarely notice, especially in photographs with soft gradients. The loss is permanent, so always keep the PNG as your editable master.
JPG has no alpha channel, so it cannot store transparency. Every see-through pixel must be filled with a solid colour during conversion. Most tools default to white. Some fill with black, which surprises people when a logo suddenly sits inside a dark box.
Pick the fill colour to match where the image will live. A logo going onto a white invoice should get white. A sticker for a dark website header should get that header's exact hex colour. Soft shadows and smooth edges blend into the fill, so match it closely to avoid a faint halo.
| Quality | Typical use | What to expect |
|---|---|---|
| 90-100 | Print, portfolios | Near-identical to the PNG, larger files |
| 80-89 | Websites, email | The best balance for most photos |
| 65-79 | Thumbnails, form uploads | Smaller files, slight softness on close zoom |
| Below 65 | Tight KB limits only | Visible blocks around edges and text |
Start at 85 and step down only if the file is still too large. Each drop of five points saves less than the one before, while artefacts grow faster.
Not every PNG should be converted. JPG handles photos well but struggles with hard edges and flat blocks of colour.
Transparent product cut-outs are a special case. If a marketplace demands a white background, converting to JPG with a white fill is exactly right. If your site places products on coloured sections, keep the PNG or use WebP instead.
For everything else, converting to JPG is the faster route to a lighter file. That includes camera photos saved as PNG by mistake.
Use the fields in the tool above and keep units and formats consistent.
Review the result shown in the output area.
Confirm that the result matches your situation before using it for a decision.
The source image is decoded and exported as JPEG.This describes the core logic used by the tool. Check any assumptions that may affect your result.
Use accurate inputs and keep units consistent.
Review the assumptions before using the result for a decision.
Compare important results with an independent or official source.
They become a solid colour, usually white, because JPG cannot store transparency. Some converters let you choose the fill. Pick the background colour of the page where the image will appear, so edges blend in cleanly.
Yes, slightly, because JPG uses lossy compression. At quality 85 or above, photographs look virtually the same to most viewers. Text, sharp lines and flat graphics show the loss sooner, often as faint blotches or fuzzy edges around letters.
For photographs, the JPG is often five to ten times smaller at good quality settings. Simple graphics with few colours shrink less and sometimes even grow. The saving depends on image detail, dimensions and the quality level you choose.
The converter filled the transparent pixels with black instead of white. This happens when empty pixels are read as zero colour values. Convert again and set the background to white, or to a colour that suits where the image will go.
For photographs shared online, JPEG is usually the better choice because it gives far smaller files with little visible difference. PNG is better for photos you are still editing, or when you need exact, lossless pixels for print or archiving.
You can, but keep quality high, around 90, so the text stays readable. Screenshots full of small writing compress poorly as JPG. If the PNG is already under a megabyte, sending it unchanged may give a cleaner result.
Start at quality 80 and lower it in steps of five while checking the size. If you reach 60 and are still above 100 KB, reduce the pixel dimensions instead. Shrinking dimensions keeps the image cleaner than very low quality settings.
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