Converts PNG to JPG; since JPG has no transparency, transparent and semi-transparent areas are flattened onto a white background.
Introduction
PNG and JPG solve different problems. PNG is lossless and can carry a transparent background; JPG is lossy and has no concept of transparency at all. Converting a PNG to JPG means giving up both of those things in exchange for a smaller, more universally accepted file — a real trade-off, not just a change of file extension.
How the Conversion Works
This tool decodes your PNG's pixel data and re-encodes it as a JPG. It accepts .png files up to 15 MB; there's no separate dimension limit beyond that file-size cap.
What Happens to Transparency
This is the single most important thing to understand before converting: PNG's format specification includes an alpha channel, letting part of an image be fully or partially see-through — commonly used for logos, icons, and diagrams with no background. JPG has no equivalent; every pixel in a JPG is fully opaque. This tool handles that by placing your PNG onto a plain white background before saving it as a JPG, so transparent and semi-transparent areas are designed to come out white in the result. If your PNG was built to sit on a coloured page, a dark background, or another image, expect those transparent regions to turn white instead — not to disappear or stay see-through. A PNG that's fully opaque already (a screenshot, a scanned page, an exported photo) isn't affected by this at all.
What Actually Happens to Image Quality
Unlike converting an image to a PDF page, which can wrap a JPG's existing pixel data without compressing it again, converting to JPG always applies a fresh round of JPEG's lossy compression — there's no way to write a JPG file without it. This tool saves at a high default quality setting, so the difference usually isn't obvious to the eye on a single conversion, but it is a genuine, real compression pass applied on top of whatever was already in your PNG — not a lossless format change.
After the Conversion
The result shows whether the JPG came out smaller or larger than your original PNG, labelled as compression or expansion. JPG's lossy compression is generally more effective on photographic content than PNG's lossless compression, so a size reduction is common — though a PNG that was already small (a simple icon or diagram, mostly flat colour) may not shrink much, or could even grow slightly once general-purpose JPEG compression is applied to it.
What to Check Before You Use the Result
- Transparent backgrounds turn white. As covered above, this is the main thing to check before relying on the output — anything that depended on transparency to look right needs a second look.
- A real compression pass is applied. This isn't a lossless format change; a JPEG quality trade-off happens every time, even if it's set high enough not to be obviously visible.
- Only .png files are accepted, up to 15 MB, and the file has to genuinely be a PNG. Validation checks the actual PNG binary signature, not just the file extension — renaming a different image format to end in
.pngwon't get it past validation. For WebP images, use Webp To JPG instead. - Multiple files convert separately. Drop several PNGs at once and each becomes its own JPG; "Download all" bundles the separate results into one ZIP file rather than combining the images.
When This Is the Right Tool
- A destination only accepts JPG: some upload systems, printing services, or older software only take JPG files, regardless of what the original image needs.
- The PNG is already fully opaque: a screenshot, scanned page, or photo saved as PNG converts cleanly, since there's no transparency for the white-background step to change.
- File size matters more than transparency: for photographic content specifically, JPG's compression usually produces a meaningfully smaller file than the PNG it replaces.
If your PNG relies on a transparent background — a logo or icon meant to sit on top of other content — converting it here will flatten that transparency to solid white, which usually isn't what you want. Keep it as a PNG in that case, or check whether the destination genuinely requires JPG before converting.
Example
A student has a PNG screenshot of a completed worksheet — a plain background, no transparency involved — and needs to attach it somewhere that only accepts JPG files. Converting it here produces a JPG that looks the same as the screenshot, since there's no transparent area for the white-background step to change, at a file size that's typically smaller than the original PNG.
FAQs
What PNG files can I convert?
.png files, up to 15 MB. There's no separate dimension limit beyond that file-size cap.
Why did my transparent PNG turn white?
JPG has no transparency channel, so this tool places your image onto a white background before saving it as a JPG. Any transparent or semi-transparent areas take on that white background instead of staying see-through.
Will converting to JPG reduce my image's quality?
Yes, to some degree — every JPG conversion applies a fresh round of lossy compression, though this tool uses a high default quality setting so the effect is usually minor on a single conversion.
Is my file kept afterward?
No. Files are processed only to complete the conversion and are automatically deleted within 2 hours — see the Privacy Policy for details.
What if I need to go the other way?
Use JPG To PNG to convert a JPG to PNG. For WebP images, see Webp To JPG.
