JPG ↔ PNG Converter
Convert between JPG and PNG in your browser with quality control, no upload.
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How it works
Your image is drawn onto an HTML5 canvas and re-encoded to the format you choose using canvas.toBlob. Converting to JPG exposes a quality slider (lossy compression) and flattens any transparency onto a white background, since JPG has no alpha channel. Converting to PNG produces lossless output that preserves transparency. The before-and-after file sizes are shown so you can judge the trade-off, then download the result. The image never leaves your device — all encoding happens locally on the canvas.
Common use cases
- Converting a transparent PNG logo to JPG to shrink its file size.
- Turning a JPG photo into PNG for an editor that needs lossless input.
- Re-saving a screenshot in the format a form or upload accepts.
Frequently asked questions
What happens to transparency when I convert PNG to JPG?
JPG does not support transparency, so transparent areas are flattened onto a white background during conversion. If you need to keep transparency, convert to or stay on PNG instead.
Does converting JPG to PNG improve quality?
No. PNG is lossless, but it cannot restore detail already discarded by JPG compression. The PNG will look identical to the JPG and usually has a larger file size.
Is my image uploaded to a server?
No. Decoding and re-encoding happen on a canvas inside your browser. The file is never transmitted, which makes it safe for private or unreleased images.