PNG to WebP Converter — Free & Private

Convert PNG images to WebP for dramatically smaller files while preserving transparency. Runs entirely in your browser using the libwebp encoder — no uploads, no server processing.

Drag & drop PNG files here or

Supports .png files

85%

Converting...

Converted Images

Convert PNG to WebP Without Losing Transparency

PNG is a lossless format that handles transparency beautifully, but it tends to produce large files — especially for photographs, detailed illustrations, and high-resolution graphics. WebP delivers the same transparency support with 30–60% smaller files at visually identical quality. This free converter makes the switch in a single click, entirely inside your browser.

Why PNG to WebP Is Often the Right Move

  • Transparency preserved — WebP fully supports alpha channels just like PNG.
  • Dramatic file size reduction — typical PNGs shrink 30–60% converting to WebP.
  • Faster websites — smaller images mean faster page loads and better search rankings.
  • Broad browser support — all modern browsers (Chrome, Firefox, Safari 14+, Edge) support WebP with transparency.

Lossy vs Lossless WebP

This tool produces lossy WebP using the Quality slider — that’s where the big size savings come from. At 85% quality (the default), the output is visually indistinguishable from the PNG source on any screen, while being 30–60% smaller. If you need pixel-perfect fidelity, keep the PNG original; for web delivery, lossy WebP is almost always the right call.

How It Works

Your PNG file is decoded by the browser, then encoded as WebP using Google’s libwebp reference encoder compiled to WebAssembly. All transparency information is preserved perfectly. Batch-convert multiple files at once and download them all as a ZIP.

Privacy & Performance

No upload. No server. No account. Your PNG files never leave your device. Works offline after the first page load. There are no artificial file-size caps, usage limits, or watermarks. Safe for confidential logos, brand assets, product photos, and anything else you want to keep private.

FAQ

Frequently Asked Questions

WebP produces files 30–60% smaller than PNG while preserving transparency. For websites serving PNG images (logos, icons, graphics with alpha channels), switching to WebP significantly improves page load speed without sacrificing visual quality. All modern browsers support WebP natively with over 97% market share.

Yes. WebP supports full alpha transparency just like PNG. Any transparent or semi-transparent pixels in your PNG will be preserved exactly in the WebP output. This makes WebP an excellent replacement for PNG on the web, combining transparency support with much smaller file sizes.

This tool uses lossy WebP encoding controlled by the Quality slider, which produces the smallest files at high visual quality. At 85% quality (default), the output is visually indistinguishable from the PNG source in most cases while being 30–60% smaller. If you need pixel-perfect preservation, keep the original PNG.

No. All conversion happens entirely on your device using WebAssembly and the libwebp encoder. Your PNG files are never transmitted, uploaded, stored, or accessed by any server. The tool works offline after the initial page load.

All modern browsers support WebP: Chrome (since 2010), Firefox (since 2019), Safari 14+ (since 2020), Edge, and Opera. Browser market share for WebP-compatible browsers is over 97% as of 2025. For legacy browser fallback, keep your PNG originals and serve them via a `<picture>` element with WebP as the primary source.