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Utilboxes

PNG to JPG

Convert PNG images to JPG for smaller files. Pick the background colour that replaces any transparency.

Files never leave your device

How to use PNG to JPG

  1. 1Add one or more PNG images.
  2. 2Choose the background colour used where the PNG is transparent — white is the usual choice.
  3. 3Set the JPEG quality.
  4. 4Download the results.

How it works

JPEG has no alpha channel, so transparency has to be resolved before encoding. The canvas is filled with your chosen colour and the PNG is drawn on top, which flattens transparent regions onto that background rather than leaving them black — which is what happens if the fill step is skipped.

For photographic content the size saving is large: a PNG photo converted at quality 85 typically lands at a fifth of the original. For flat graphics, logos and screenshots the saving is smaller and the artefacts more visible, so PNG is often the better format to keep.

Images are decoded by the browser, redrawn on a canvas and re-encoded on your own machine. Nothing is uploaded, so there is no waiting on a queue and no copy of your photos anywhere else.

Frequently asked questions

What happens to transparent areas?
They are filled with the background colour you choose, because JPEG cannot store transparency. White is the default and suits most cases.
How much smaller will the JPG be?
For photographs, often 70–85% smaller. For flat graphics and screenshots the saving is much less, and PNG may be the better choice.
Should I convert screenshots to JPG?
Usually not. JPEG blurs the sharp edges of text and interface elements. Keep screenshots as PNG, or use WebP for a smaller lossless file.

Related tools

JPG to PNGConvert JPG photos to lossless PNG files.Image ConverterConvert between JPG, PNG and WebP in a single batch.Compress ImageCut image file size with a live before-and-after preview.WebP to JPGTurn WebP images into JPGs that any app can open.