ImgSmaller ImgSmaller

Compress PNG Online – Zero-Upload & Full Transparency

Free, private PNG compressor. Reduce file size without losing quality or transparency. 100% Zero-Upload: Your images never leave your browser.

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What is Zero-Upload?

All processing happens in your browser. No data is sent to our servers. Learn More

KB
Output:
EXIF / metadata:
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What this tool does

The Zero-Upload PNG Compressor That Preserves Transparency

 

The PNG (Portable Network Graphics) format is the best choice for web graphics, logos, and icons because it supports true lossless compression and the essential alpha transparency channel. However, unoptimized PNGs often have bloated file sizes.

ImgSmaller.com is engineered to give you the smallest file size possible while keeping the quality and, crucially, the transparent background you need—all with maximum privacy.

 

🔒 TRUE ZERO-UPLOAD PRIVACY MODE (Browser-Based)

 

Unlike other tools that send your files to a server, our PNG compression is processed entirely on your local device using advanced browser technology.

  • No Upload Required: Your images are loaded into your browser's memory, compressed, and downloaded directly back to your device.

  • 100% Private: Since the file never leaves your computer, there is zero risk of data interception or storage. This is the highest level of privacy available for an online tool.

 

✅ Key Features for Perfect PNG Optimization

 

Feature SEO & User Benefit
Full Transparency Support The compression algorithm respects and maintains the PNG's essential alpha channel, ensuring your backgrounds remain perfectly transparent for web use.
Lossy & Lossless Reduction Offers multiple optimization techniques, including true lossless compression and smart lossy compression (color palette reduction) for up to 70% greater savings with minimal quality impact.
Zero-Upload Mode The entire process happens locally, guaranteeing maximum privacy and faster processing times for smaller files.
Preserves Dimensions Reduces the file size (MB/KB) only. Your original width and height (resolution) remain untouched.

 

How to Compress Your PNG Images Privately

 

  1. Select Your PNGs: Click "Select Image Files" or drag-and-drop your PNG files into the box.

  2. Compress in Browser: The optimization begins instantly on your device. Watch the file size drop in real-time.

  3. Download Securely: Save your optimized, high-quality, and fully transparent PNGs back to your computer.

Does ImgSmaller’s PNG Compressor support Zero-Upload Mode? ›
Yes. The PNG compression is done 100% in your browser. Your images are never uploaded to our servers, ensuring maximum security and speed.
Will the compression affect the transparent background of my PNG file? ›
No. Our algorithms are specifically designed to preserve the alpha transparency channel in your PNG images, making it perfect for logos, icons, and web graphics.
Is the compression truly lossless? ›
We offer both lossless and a highly optimized "smart lossy" compression. Lossless removes only redundant data, while smart lossy (which yields the biggest reduction) slightly reduces the color palette—a change that is typically invisible to the human eye—while still preserving the full transparency.