CodeKitHubWhat Is This Tool?
PNG and JPG store images differently: PNG is lossless and supports transparency, which makes it big — especially for photos. JPG is a lossy photographic format that gets the same visual result at a fraction of the size, but supports no transparency. Converting PNG to JPG is one of the most common image tasks: forms and websites that only accept JPG, email attachments that are too large, and photo PNGs wasting disk space.
The conversion re-encodes the pixels into JPG at your chosen quality. Since JPG can't represent transparency, any transparent regions are composited onto a white background — the standard behavior you also get when printing.
Why Use It?
- Runs locally in your browser — images are never uploaded, so it's fast and private.
- Batch conversion: drop dozens of PNGs at once.
- Transparent areas correctly become white instead of black (a common bug in naive converters).
- Quality slider with live output sizes — see exactly what you save.
- Free, no watermark, no account, no file limits.
How to Use
- Click the box or drag your PNG files onto it.
- Adjust output quality if needed (92% default keeps full visual quality).
- Each converted file appears with its new size and a thumbnail preview.
- Click Download next to each JPG.
Example
Input
screenshot.png — 2.4 MB, with transparent cornersOutput
screenshot.jpg — 310 KB, corners whitePhotographic PNGs typically shrink 5–10×; the transparency is filled with white.
From our own testing
The transparency handling on this page isn't taken on faith. Before launch we converted a PNG with a transparent region, then sampled the output JPG's pixels programmatically: the formerly transparent area reads exactly (255, 255, 255) — pure white — and the colored region survived within codec tolerance. We test this specifically because it's the classic failure mode of quick canvas converters: forget to paint the background first and every transparent logo comes out on black. If you've been burned by that elsewhere, that's the bug, and this page doesn't have it.
Frequently Asked Questions
What happens to transparent parts of my PNG?
They're filled with white. JPG simply has no concept of transparency, so every converter must pick a background; white matches what you'd see on paper or a typical web page. If you need to keep transparency, stay with PNG or use WebP.
Will converting reduce quality?
JPG is lossy, so technically yes — but at the default 92% quality the difference is invisible for photos. Screenshots with sharp text show JPG artifacts sooner; use 95%+ quality for those, or reconsider whether JPG is the right target.
Why is my JPG so much smaller than the PNG?
PNG stores photos losslessly, which costs a lot of bytes. JPG throws away detail your eye can't see. A 5–10× reduction is normal for photographic content — that's exactly why JPG is the standard for photos.
Can I convert many PNGs at once?
Yes — select or drop as many as you like. Each file is converted independently and gets its own download button. There's no batch limit because everything runs on your device.
Are my images uploaded to your server?
No. The conversion uses your browser's canvas API locally. The images never leave your computer — you can even use the tool offline once the page is loaded.