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ConvertBox

JPG to PNG

Convert JPG to PNG online — keep full transparency, batch up to 50MB per image, process locally in your browser. Free, no upload, no watermark.

🖼️

Select Image Files

You can convert multiple files at once

Max file size: 50MB • Multiple files allowed

or drag and drop · press Enter to browse

Fast Conversion

Convert instantly in browser

Secure Processing

Files are never sent to a server

Batch Conversion

Process multiple files at once

How to Use

  1. Select JPG files to convert
  2. Files are automatically converted to PNG
  3. Download individual files or all at once
  4. Verify the output file in your device's download folder.
  5. You can adjust settings and process new files immediately without any restrictions.

All processing is done in your browser, and files are never sent to a server.

Frequently Asked Questions

PNG supports transparency and lossless compression, making it ideal for graphics, logos, and images that need a transparent background.
PNG files are typically larger than JPG because PNG uses lossless compression. The trade-off is better quality preservation.
Yes, you can select and convert multiple JPG files to PNG simultaneously.
No. All operations are processed entirely inside your browser's local sandbox using client-side APIs (like WebAssembly, pdf-lib, or HTML5 Canvas). Your files and data never leave your device.
The tool is completely free with no usage limits. However, since processing occurs in your browser's memory, we recommend keeping file sizes under 50MB (especially for heavy files like PDFs or videos) to ensure stability.
No. All tools on ConvertBox are 100% free. We do not insert watermarks, limit features, or require any registration or payment.
Yes. Once the page and its local library dependencies are loaded in your browser, the conversion logic runs completely offline without needing an active internet connection.

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