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Lossless PNG Optimizer

Make PNG files smaller without changing a single pixel. Free, no account - and your file never leaves this browser tab.

Drop your image here

or click to browse — pasting a screenshot works too

PNG up to 25MB · select multiple files with Pro
Processed on this device. Never uploaded.
Batch processing is Pro

Process the whole folder at once.

You selected multiple files — we loaded the first one for free. GenClean Pro processes the entire batch locally and hands you one ZIP, with no ads.

  • Batch queues and one-click ZIP export
  • No ads, ever
  • Every future tool included
  • One payment - $9 lifetime
Unlock Pro - $9
How it works

Optimize PNG in 4 steps

  1. Drop a PNG file onto the optimizer or click Choose File.

  2. Choose Balanced for everyday assets or Maximum when every byte matters.

  3. Compare the original and optimized file sizes; the pixels and transparency stay unchanged.

  4. Download the losslessly optimized PNG.

When to use it

Use this when the file must remain a PNG. OxiPNG tests more efficient filters and compression settings around the same pixel data, so dimensions, transparency, and visual quality remain unchanged. Savings are usually modest because PNG is already compressed, but the result is a genuine smaller .png rather than a WebP conversion.

  • Reduce PNG website assets while preserving their exact format and alpha transparency.
  • Clean up oversized PNG exports from design, screenshot, and illustration apps.
  • Optimize app icons and UI graphics without introducing color banding or blur.

Format & quality notes

  • This is lossless PNG-to-PNG optimization: it does not resize, reduce colors, or convert the file to WebP.
  • Already optimized PNGs may save only a few bytes; screenshots and editor exports often have more room to shrink.
  • Maximum effort can take longer on large files because the optimizer evaluates more compression combinations.
FAQ

Questions about the Lossless PNG Optimizer.

Does the optimized file remain a PNG?

Yes. The input and output are both .png files. Transparency, dimensions, and decoded pixels are preserved.

Is lossless PNG optimization the same as PNG compression?

Not always. Many PNG compressor pages create WebP or reduce the color palette. This tool only repacks the existing PNG data more efficiently, so there is no visual quality loss.

Why are the savings smaller than PNG to WebP?

PNG is already a lossless compressed format. Better filters and DEFLATE settings can remove overhead, but keeping every pixel and keeping PNG places a firm limit on savings.

Is my PNG uploaded for optimization?

No. OxiPNG runs as WebAssembly inside your browser. The file is read from your device and the optimized copy is created locally.

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