PNG Optimizer
Optimize and compress your PNG images directly in your browser.
Drag & Drop PNG files here
or click to browse
PNG Optimizer — Smaller PNGs, Same Look
PNG files are heavy, and heavy images slow down websites. Drop your PNGs into this free optimizer and shrink them in your browser with the UPNG engine — choose from lossless 256-color down to maximum 16-color compression.
A live console narrates each step, and every optimized file gets its own download button with the size savings shown. Your images never leave your device.
Five compression levels
From lossless 256 colors through balanced 64 to maximum 16 — pick the trade-off between file size and fidelity that fits your use.
Batch optimization
Drop multiple PNG files at once. Each one is processed in turn with its own result row and download button.
Private by design
Compression runs entirely in your browser with UPNG and pako — no uploads, no queues, no waiting on a server.
How to use
- Drag and drop your PNG files into the drop zone.
- Choose an optimization level (256 down to 16 colors).
- Watch the console as each file is optimized.
- Download the smaller PNGs from the results list.
Frequently Asked Questions
How does PNG optimization work?
The tool reduces the number of colors in the image palette (for example, 256 down to 64), which shrinks the file while keeping it visually close to the original.
Is the 256-color mode truly lossless?
The 256-color level preserves the full palette — for most PNGs this keeps the image visually identical while still trimming metadata overhead.
Can I optimize multiple PNGs at once?
Yes. Drop several files and each is optimized and listed with its own download button.
Are my images uploaded anywhere?
No. Optimization runs entirely in your browser using the UPNG engine.
Is the PNG optimizer free?
Yes, free with no signup.
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