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How to Convert PNG to JPG (and Back) — and Which One You Actually Want

2026-06-12

Short answer: To convert PNG to JPG (or JPG to PNG), ToolKoala's image converter does it in your browser — drop the image, pick the output format, download. No upload. One thing to know before you do it: converting PNG → JPG throws away transparency, because JPG can't store it. If your PNG has a see-through background, JPG will fill it with a solid color (usually white). For photos that's fine; for logos it's a problem.

How to convert (PNG ↔ JPG)

  1. Open the converter.
  2. Drop in your PNG or JPG.
  3. Choose the output format — JPG, PNG, or WebP.
  4. Download the result.

That's it. Because it runs locally, you can do a batch of screenshots without any of them touching a server — handy if they contain dashboards, account info, or anything you'd rather not upload. Check the Network tab in DevTools (F12) if you want to confirm nothing's leaving.

Which format do you actually want?

This is the part people get wrong. The formats aren't interchangeable:

  • PNG — lossless, supports transparency. Best for logos, icons, screenshots, and any image with text or sharp edges. Files are bigger.
  • JPG — lossy, no transparency, much smaller. Best for photographs and anything with smooth gradients. Re-saving repeatedly degrades it, so keep an original.
  • WebP — the modern middle ground: smaller than both and supports transparency. Best for images on a website you control. Older software and some email clients still choke on it, so it's not a safe "send to anyone" format.

Quick rule: photo → JPG (or WebP for web). Logo/screenshot/anything transparent → PNG (or WebP for web). Sending to a stranger who might use old software → JPG or PNG.

The transparency trap (and a fix)

Say you have a logo on a transparent background and convert it to JPG to make it smaller. You'll get an ugly white rectangle behind it. JPG simply has no transparency channel, so the converter has to flatten it onto a background.

If you need it small and transparent, convert to WebP instead of JPG. If you actually want the background gone — say it came on a solid color and you want it transparent — run it through remove background first, save as PNG or WebP, then you're set. And if your PNG is just too heavy, compress shrinks it without changing the format.

Honest alternatives

  • Preview (Mac) / Paint (Windows) — free, already installed. Open the image, "Export As" or "Save As", pick the format. Fine for one file; tedious for many, and Paint's PNG transparency handling is fiddly.
  • Photoshop "Export As" (~$23/mo) — full control over quality and color, overkill if converting is all you need.
  • Online converters — many work well but upload your image to their servers. Avoid for anything sensitive.

FAQ

Does converting PNG to JPG lose quality? JPG is lossy, so yes, a little — usually invisible for photos at high quality. The bigger loss is transparency, which JPG can't keep at all.

Should I use PNG or JPG for a logo? PNG (or WebP). Logos need sharp edges and usually transparency, and JPG blurs edges and can't do transparency.

What's the smallest format with transparency? WebP. It beats PNG on size and, unlike JPG, keeps the transparent background.

Can I convert without uploading my image? Yes — a browser-based converter like ToolKoala does everything on your device. Confirm with the DevTools Network tab.

— Milo 🐨