Compress PNG Image Online — Lossless, Free
100% Private — files never leave your device
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Supports: PNG
How to Reduce PNG File Size
Vizua is a free online PNG compressor powered by OxiPNG, a modern PNG optimizer. Unlike server-based tools, Vizua processes your images entirely in your browser — no files are ever uploaded.
To compress a PNG, drop your file into the tool above and Vizua will automatically optimize it. OxiPNG tests multiple compression strategies and selects the smallest output, achieving 10-50% file size reduction with absolutely zero quality loss. Every pixel remains identical to the original.
Why Compress PNG Files?
- Faster page loads — smaller PNGs improve website performance and Core Web Vitals scores
- Save bandwidth — reduce data transfer costs for websites serving thousands of images
- Meet size limits — many platforms cap upload sizes for icons, logos, and screenshots
- Preserve transparency — unlike JPEG, PNG supports alpha channels, making it the go-to format for logos and UI elements
Lossless Optimization — No Quality Trade-Off
Vizua's PNG compression is purely lossless — your image data is never altered. OxiPNG finds more efficient ways to store the exact same pixels, often producing smaller files than other optimizers — especially on complex images with gradients or transparency.
This is fundamentally different from tools that reduce colors from millions to 256 to shrink PNGs — those produce smaller files but at a visible quality cost. With Vizua, every pixel stays identical to the original.
When to Use PNG vs JPEG or WebP
PNG is ideal for images that require transparency, sharp text, or pixel-perfect reproduction — screenshots, logos, icons, diagrams, and UI elements. For photographs without transparency, JPEG or WebP will typically produce much smaller files. Vizua offers compressors for all three formats.
100% Private — No Upload Required
Every PNG you compress stays on your device. Vizua runs OxiPNG locally in your browser without any network requests. This makes it perfect for proprietary designs, client work, or any image you need to keep private. You can disconnect from the internet and Vizua continues to work.
Frequently Asked Questions
How do I reduce PNG file size?
Drop your PNG into Vizua and it will be optimized automatically. The tool reduces file size by removing unnecessary metadata and finding more efficient ways to store the same image data — all without changing a single pixel.
Does compressing a PNG lose quality?
No. Vizua's PNG compression is 100% lossless — every pixel in the output is identical to the original. It achieves smaller files by finding more efficient ways to store the same data, similar to how a ZIP file works. Your image quality is completely preserved.
What is OxiPNG and how does it work?
OxiPNG is a modern PNG optimizer that tries multiple compression strategies and keeps the smallest result. Vizua runs OxiPNG directly in your browser, so your files stay private and never leave your device.
How much smaller will my PNG file be?
Typical reduction is 10-50% depending on the image content and how the original was saved. PNGs exported from design tools like Figma or Photoshop often have suboptimal compression and see the largest gains. Screenshots and simple graphics also compress well.
Can I compress multiple PNG files at once?
Yes. Drop as many PNG files as you need — Vizua processes them all in parallel using Web Workers and lets you download each individually or as a single ZIP archive. There is no file limit.