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ConvertBox

Image Converter

Convert images between JPG, PNG, WebP and HEIC in your browser. Batch up to 50MB per file, lossless or quality-controlled output — no uploads, no signup.

🖼️

Select image files

Supports all image formats including JPG, PNG, GIF, WebP

Max file size: 50MB • Multiple files allowed

or drag and drop · press Enter to browse

Supported formats

JPEG

Compressed format ideal for photos. Small file size with adjustable quality

PNG

Supports transparent backgrounds. Lossless compression ideal for logos and graphics

WebP

Modern web standard. 30% smaller than JPEG, supports transparency

How to Use

  1. Select image files to convert
  2. Choose the target format
  3. Download the converted images
  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

You can convert between JPEG, PNG, WebP, and other common image formats.
Yes, batch conversion is supported for processing multiple files simultaneously.
It depends on the target format. PNG and WebP lossless are lossless, while JPEG applies compression.
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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