JPG to PNG Converter

Summary

This tool converts JPG or JPEG images to lossless PNG format directly in your browser using the HTML5 Canvas API. No files are ever sent to a server — everything is processed locally on your device. You can convert multiple images at once and download each PNG individually.

How it works

1. Click "Choose Images" or drag and drop one or more JPG/JPEG files onto the drop zone.
2. The tool reads each file using the FileReader API and draws it onto an HTML5 Canvas.
3. The canvas is exported as a PNG data URL using toDataURL("image/png").
4. A preview thumbnail and file size are shown for each converted image.
5. Click "Download PNG" next to any image, or "Download All" to save everything at once.

Use cases

• Convert product photos from JPG to lossless PNG before uploading to design tools.
• Convert screenshots saved as JPG when a workflow or design tool requires PNG format.
• Batch-convert a set of JPG images to PNG without installing any software.
• Prepare images for web use where PNG is required by a CMS or design specification.
• Convert JPG icons or logos to PNG for better quality when overlaid on colored backgrounds.
• Process images privately without sending files to a third-party server.

Frequently Asked Questions