Is PNG compression lossless?

We offer smart color palette optimization which achieves substantial size reduction while keeping alpha channels and sharp lines intact.

Zero Server Upload • Local RAM Only

100% Client-Side Lossless & Palette

Compress PNG

Optimize PNG images by reducing palette depth and metadata while keeping transparency intact.

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Processed 100% locally in your browser. Files never touch our servers.

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Max file size: 50 MB•Single file

Choose a PNG image file from your computer or phone.

Select between balanced palette quantization or high-fidelity mode.

Check the real size reduction and download your compressed PNG.

No. ZeroUpload.in preserves full alpha transparency channels during PNG compression.

Reduce JPG file size while keeping high visual clarity.

Convert PNG to JPG with customizable background color.

Change image dimensions by pixels or percentage quickly.

Crop JPG, PNG, and WebP with precision and aspect ratio presets.