PNG Compressor Tool

PNG is a lossless compression format, meaning it doesn't discard image data like JPG does. Our client-side PNG compressor primarily reduces file size through:

• Color Reduction (Posterization): This is the main technique. By reducing the number of distinct colors in your image (e.g., from millions to a few hundred or less), the PNG encoder can often find more efficient ways to store the data, leading to smaller files. This is especially effective for graphics, illustrations, or images that don't require a full 24-bit color palette.
• Resizing: Making the image dimensions smaller (width/height) directly reduces the number of pixels, which is a very effective way to decrease file size for any image format.
• Browser Optimization: When an image is drawn to an HTML canvas and then exported as a PNG, the browser's internal PNG encoder applies its own set of lossless compression techniques. This process also naturally strips most metadata.

For more advanced PNG optimization (like fine-tuning DEFLATE settings or using sophisticated palette generation), server-side tools like OptiPNG or pngquant are typically used. This tool provides effective client-side strategies for common use cases.

1. Upload PNG Files: Drag and drop your PNG images, or click to select files.
2. Adjust Compression Settings (Optional):
   • **Color Reduction:** Enable "Reduce Colors (Posterize)" and use the slider to set the desired number of color levels per channel. Fewer levels generally mean smaller files but more noticeable color changes.
   • **Resize:** If needed, enable resizing and specify new dimensions or a percentage.
   • **Naming:** Add a prefix or suffix for the output filenames.
3. Compress: Click the "Compress PNGs" button.
4. Download: Download your optimized PNG files.