Compress PNG images online

Shrink PNG files while preserving transparency. Free, private, no signup needed.

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Pre-configured for PNG optimization

Compress PNG Online — Free, Fast & Private

PNG files are popular for graphics, logos, screenshots, and any image that needs transparency. However, they can be significantly larger than JPEG files because PNG uses lossless compression by default.

MiniPx reduces PNG file size by converting the color space and applying optimized compression. For maximum reduction, you can convert your PNG to WebP format, which supports transparency and typically produces files 25-35% smaller than PNG.

All processing happens in your browser. Your PNG files are never uploaded to any server, making MiniPx the most private PNG compressor available.

How it works

  1. Upload your PNG: Drag and drop or click to select your PNG files. Transparent PNGs are fully supported.
  2. Choose settings: Select your compression level. For PNGs, converting to WebP offers the best size reduction while keeping transparency.
  3. Compress: Click the Compress button. Your browser handles all processing locally.
  4. Download: Save your compressed files individually or all at once.

Frequently asked questions

Can I compress PNG without losing transparency?
Yes. When you output as PNG or WebP, transparency is fully preserved. Only JPEG output removes transparency (replacing it with a white background).
How much smaller will my PNG get?
It depends on the image. Simple graphics with few colors can be reduced by 50-70%. Complex photographic PNGs may see 20-40% reduction. Converting to WebP typically saves an additional 25-35%.
Is PNG or WebP better for my website?
WebP is generally better for websites. It produces smaller files than PNG while supporting transparency, and is now supported by all major browsers including Safari.
Does MiniPx upload my PNG files?
No. All compression happens in your browser using JavaScript. Your files never leave your device. You can verify this by using MiniPx offline.

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