How to Convert JPG to PNG Online

Why convert JPG to PNG?

JPG and PNG are different image formats designed for different needs. JPG is commonly used for photographs and often produces smaller files. PNG uses lossless encoding and can support transparency, making it useful for graphics, screenshots, logos, and images where preserving the source pixels matters.

Converting JPG to PNG changes the file format, but it does not restore detail that was already lost when the image was saved as a JPG.

How to convert JPG to PNG

1. Select a JPG or JPEG image.
2. Open ToolAlto's JPG to PNG Converter.
3. Choose the image and select Convert to PNG.
4. Download the resulting PNG file.
5. Open the PNG and check that its dimensions and appearance are correct.

What happens during conversion?

The JPG image is decoded by your browser and drawn onto a canvas. The canvas is then exported as a PNG image. The output keeps the original image dimensions, while the file itself uses PNG encoding.

Because the conversion is performed in your browser, the image does not need to be uploaded to a ToolAlto server for conversion.

Does JPG to PNG improve image quality?

No. PNG is lossless, but converting an already-compressed JPG to PNG cannot recreate details that were removed by the earlier JPG compression. PNG can prevent another round of lossy compression, but it is not a quality-restoration method.

Will the PNG have a transparent background?

No. A JPG does not contain an alpha transparency channel, so converting a JPG to PNG does not magically make its existing background transparent. If you need to remove a background, that requires a separate image-editing process.

JPG vs PNG: which should you use?

• Choose JPG when you mainly need a compact format for photographs.
• Choose PNG when lossless encoding, sharp graphics, screenshots, or transparency support is important.
• Keep the JPG when converting would only make the file larger without providing a useful benefit.

For a fuller comparison, read JPG vs PNG: Which Image Format Should You Use?.

What if the PNG file is too large?

PNG files can be larger than JPG files, especially for photographs. If the converted image is too large, try ToolAlto's Image Compressor. If you need specific pixel dimensions too, use the Image Resizer.

Common mistakes to avoid

• Expecting JPG to PNG conversion to restore lost detail.
• Assuming every JPG can become transparent just because PNG supports transparency.
• Converting photographs to PNG when the larger file size provides no practical benefit.
• Forgetting to check the converted image before uploading or sharing it.
• Changing image dimensions unintentionally during a separate editing step.

Frequently asked questions