PNG Compressor

Reduce PNG file size instantly using smart color quantization.

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PNG Compressor
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Upload Image

Browse for a PNG file or drag & drop it here.

80%
Smaller Size Better Quality

Adjusting the level reduces the number of colors in the image.

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About the PNG Compressor

We created this PNG Compressor to help developers and designers reduce the file size of their transparent images without sacrificing quality. While standard compression tools often struggle with PNGs, our tool uses advanced color quantization algorithms to selectively reduce the number of colors in the image palette. This method can reduce file sizes by up to 80% while keeping the image looking virtually identical to the human eye.

The highlight of this tool is its real-time comparison slider. You don't have to guess if the quality is "good enough." You can instantly see the difference between the original and compressed versions side-by-side. This ensures you can push the compression as far as possible to maximize website speed without making your graphics look pixelated or washed out.

Your privacy is paramount. Unlike many other online compressors that upload your images to their servers, our tool runs entirely within your web browser using JavaScript. Your images are processed locally on your computer, meaning your data is safe, secure, and the compression happens instantly.

How to Use the Tool

  • Upload your PNG file by clicking the browse box or dragging and dropping it.
  • The tool will analyze the image and apply a default compression level.
  • Use the interactive slider on the image to compare the "Original" (right) vs "Compressed" (left) versions.
  • Adjust the "Compression Level" slider. Lower values mean fewer colors and smaller files, while higher values keep more detail.
  • Check the "Savings" badge to see exactly how much smaller your file has become.
  • Click "Download Compressed PNG" to save the optimized file to your device.

Frequently Asked Questions

How does PNG compression work?

PNG is a lossless format, but our tool creates "lossy" PNGs by using color quantization. This process converts 24-bit or 32-bit images into 8-bit images by reducing the number of unique colors (similar to how GIFs work) while preserving the full alpha channel transparency. This results in massive file size savings.

Will I lose transparency?

No. Our compressor is specifically designed to preserve the alpha channel. You can compress logos, icons, and graphics with transparent backgrounds, and they will remain transparent in the output file.

Why does the quality look bad at low settings?

When you set the quality slider very low (e.g., below 40%), the tool forces the image to use very few colors (e.g., 32 colors or less). This causes "banding" in gradients and loss of detail. We recommend a setting between 70% and 80% for the best balance of size and quality.

Can I compress existing WEBP or JPG files?

While this tool is optimized for PNG output, you can upload JPG or WEBP files. The tool will convert them to PNG and then apply the compression. However, converting JPG to PNG usually increases file size, so this is best used for source images that need to be PNG.

Is my data secure?

Absolutely. All processing happens locally in your browser using advanced WebAssembly and JavaScript libraries. We never see, store, or upload your images to any server.

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