PNG to JPEG Converter

PNGs that are really photos belong in JPEG

Photo PNGs commonly run 3-10 MB at 1080p. The same content at JPEG quality 85 drops below 500 KB with no visible change for a viewer at normal zoom. That's not PNG failing — PNG's lossless compression is built for flat color, crisp text, and alpha, and photographic content is the one case it was never designed to handle.

PNG (1080p photo)
3-10 MB
JPEG quality 85
300-500 KB
Reduction
10-30×

The moment you realize the file is a photo saved as PNG, JPEG is the right answer. It's exactly the content class JPEG was designed around — smooth gradients, natural noise, and frequencies the human eye can't track precisely.

What the JPEG quality slider actually controls

JPEG quality is a knob on the encoder's quantization tables — higher numbers preserve more of the fine frequency detail the DCT step would otherwise throw away. It's not a percentage of anything, and the curve is not linear. The default here is 85 because that's where most photographic content stops getting meaningfully smaller without picking up visible artifacts. In practice, the ranges behave like this on natural imagery:

  • 95-100: near-transparent to the source; file size barely drops versus a lossless export. Use when the JPEG will be re-edited or printed.
  • 85-90: the web and social sweet spot. Most viewers cannot tell a quality-85 export from the original at normal zoom.
  • 75-80: aggressive. Fine for thumbnails, email attachments, and low-bandwidth delivery.
  • Below 70: visible blocking in skies and smooth gradients, halos around high-contrast edges. Avoid unless file size is the only thing that matters.

I default to 85 on every PNG-to-JPEG job unless the destination tells me otherwise. If the export will ride through another editor or a print pipeline, bump to 92; if it's a bandwidth-sensitive hero on a slow mobile connection, 78 still looks clean.

When to keep the PNG instead

Not every PNG should convert. JPEG's compression model is tuned for continuous-tone photos, and it actively hurts a few content classes. If the source is any of the following, stay on PNG (or move to lossless WebP):

  • Transparency. JPEG has no alpha channel. Anything see-through gets flattened onto a solid color.
  • Screenshots of UI or text. JPEG's DCT compression smears sharp edges, which is exactly the content PNG's filtering is good at.
  • Logos and flat-color illustrations. PNG is already small on this content, and JPEG will introduce color bleeding around edges and mosquito noise in corners.
  • Working files you'll re-edit. Every JPEG re-save compounds artifacts. Keep a PNG master and export JPEG only as the final step.

If the PNG is a photograph, a scan, or a render with natural noise and gradients, JPEG is the right answer. If it's anything on that list, PNG is the right answer.

Transparency does not survive the trip

JPEG has no alpha channel. Anything transparent in the source PNG composites onto a solid background during export (white by default). If the background color matters, flatten intentionally in your editor against the destination color first so the edges land the way you want them.

Verify at 100% around hair, glass, fur, and anti-aliased type — those are where a bad alpha flattening shows up as a halo or a hard fringe. If you see either, go back and flatten against the right color instead of accepting the default.

PNG to JPEG questions, answered

Will PNG to JPEG lose quality?

Yes — JPEG is lossy by definition. At quality 85, the loss is below the threshold most viewers can detect on photographic content at normal zoom. On screenshots, text, or line art, the loss is visible and usually unacceptable; keep those as PNG.

What quality setting should I use for PNG to JPEG?

Quality 85 is the default for web and social delivery and matches what most photo pipelines ship. Use 90-95 if the JPEG will be re-edited or printed. Drop to 75-80 only when bandwidth matters more than clean edges. Below 70 you'll see blocking in skies and halos around high-contrast lines.

Does PNG to JPEG reduce file size?

Almost always on photographic content — expect a 10-30× reduction at quality 85. On screenshots, logos, or images with large flat-color regions, JPEG can actually produce a larger file than the original PNG while also looking worse. Check the source before assuming the conversion saves bytes.

Can I keep transparency when converting PNG to JPEG?

No. JPEG does not support an alpha channel. Transparent pixels are composited onto a solid color (white by default) during export. If you need transparency, convert to WebP or AVIF instead — both are widely supported in modern browsers and preserve the alpha channel.

Is converting PNG to JPEG reversible?

No. Once the JPEG is written, the frequency data the encoder discarded is gone. You can re-save the JPEG back to PNG, but you won't recover the detail JPEG dropped, and you'll usually end up with a PNG larger than one exported directly from the original source.