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convert PNG to WebP

Convert PNG to WebP: preserved transparency with smaller file

WebP supports the alpha channel (transparency) just like PNG — but with significantly better compression. A PNG logo with transparent background converted to WebP typically results in a file 25–40% smaller, maintaining exactly the same transparency. This is the ideal conversion for logos, icons, UI elements and any transparent image destined for the web.

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Why WebP beats PNG for web images with transparency

  • PNG uses lossless compression (DEFLATE) that preserves every pixel — great for quality but results in large files. Lossless WebP uses a more advanced prediction technique that produces files typically 26% smaller than equivalent PNG. Lossy WebP with alpha offers even greater reduction (40–60%) with minimal loss in the colored area — transparency remains exact.
  • For web interfaces with many icons and graphic elements, migrating from PNG to WebP can reduce asset weight by 25–40%. Modern browsers (Chrome, Firefox, Edge, Safari 14+) support WebP with transparency without needing a fallback. The HTML5 <picture> element allows serving WebP with PNG fallback for older browsers.

Typical PNG→WebP reduction

Logo with transparency 400×200

Input
PNG: 28 KB
Expected output
WebP lossless: ~18 KB (−36%)

Exact transparency preserved. Identical visual quality.

Interface icon 64×64 with alpha

Input
PNG: 3,2 KB
Expected output
WebP: ~1,9 KB (−41%)

Small savings per icon, but significant in design systems with hundreds of icons.

Full tool FAQ

Transparency is filled with white, because the JPEG format does not support an alpha channel. If you need to preserve transparency, convert to PNG or WebP. The tool automatically warns you when this situation occurs.

Frequently asked questions

Does WebP preserve PNG transparency?

Yes. WebP supports an 8-bit alpha channel, same as PNG. All partial transparency (semi-transparency, shadows, antialiased edges) is preserved with fidelity in the resulting WebP.

Is transparent WebP supported in all browsers?

Chrome, Firefox, Edge and Safari 14+ (2020) support transparent WebP. Internet Explorer does not support WebP. If your site needs to support IE or Safari < 14, use the <picture> tag with PNG as fallback.