Technical Process and Supported Formats

This image converter leverages the power of the browser’s native Canvas API. When you upload an image, it is loaded into an in-memory HTML5 Canvas element. The conversion is then executed by calling the internal canvas.toBlob() method, which handles the necessary image encoding based on the MIME type you select. This approach is fundamental to ensuring security and speed.

Supported Output Formats:

• JPEG (image/jpeg): Ideal for photographs, as it uses lossy compression to achieve small file sizes. Quality is adjustable (controlled by the “High Quality” checkbox).
• PNG (image/png): Best for graphics, logos, and images with text, as it uses lossless compression and supports transparency.
• WEBP (image/webp): A modern format offering superior lossless and lossy compression compared to JPEG and PNG. Widely supported by contemporary browsers.
• BMP (image/bmp): An older, uncompressed format resulting in large file sizes. Primarily supported for compatibility purposes.

Note on Quality: For JPEG and WEBP, the “High Quality” checkbox adjusts the compression level used by the browser’s encoder. A higher quality setting means less compression, resulting in a larger file size but better visual fidelity. For PNG and BMP (which are lossless formats), this setting has minimal or no effect.

Privacy and Security Protocols

A major advantage of using a client-side tool like this is the inherent security model. Since the entire application runs locally within your browser tab, your images never leave your computer. The workflow is strictly as follows:

1. The file is selected from your hard drive.
2. The file is loaded directly into your browser’s Random Access Memory (RAM).
3. The image conversion (Canvas drawing and re-encoding) occurs entirely within the browser’s memory.
4. The resulting file is immediately downloaded back to your local machine.

There are no server uploads, no temporary storage, and no tracking of your files. This method guarantees 100% privacy for all your conversion tasks, making it a trustworthy tool for handling sensitive or personal imagery.

Current Technical Limitations

Due to limitations in current web technologies and licensing restrictions, certain complex formats cannot be supported in a 100% client-side, zero-dependency environment. It is important to acknowledge these constraints when using this tool:

• HEIC/HEIF Support: Currently, this tool cannot directly convert Apple’s High Efficiency Image Format (HEIC). Decoding HEIC files requires specialized JavaScript libraries that cannot be bundled easily within the strict constraints of this single-file utility. If you need to convert an iPhone photo (which is often HEIC), it must be manually converted to JPG or PNG before uploading here.
• Bulk ZIP Download: To avoid reliance on third-party libraries (like JSZip), the bulk download button is unavailable. You must download each converted image individually from the results grid.
• Maximum File Size: Processing occurs in the browser’s memory (RAM). Converting large batches of images, or very high-resolution images (e.g., greater than 100 megapixels), may cause the browser tab to slow down or crash due to memory exhaustion. It is advised to process files in small batches.

We recommend using up-to-date browsers (Chrome, Firefox, Edge, Safari) for the best performance and widest support for all listed output formats, especially WEBP and BMP.