Krunkit

Convert PNG to WebP

Get smaller files with WebP's superior compression. Keeps transparency and runs 100% in your browser.

Drop images here or click to browse (up to 10)

JPEG, PNG, WebP, AVIF up to 50MB each

PNG vs WebP: Why Convert

Compression

WebP offers 25-35% smaller files than PNG with lossless compression, or even more with lossy.

Transparency

WebP supports alpha transparency just like PNG, so no data is lost.

Browser Support

WebP is supported in all modern browsers including Chrome, Firefox, Safari, and Edge.

Best For

Web images, app assets, and anywhere you need small files with transparency support.

Achieving 30% Smaller Files Without Sacrificing Lossless Quality

WebP offers something unique for PNG users: a lossless compression mode that consistently produces files 26-34% smaller than PNG, according to Google's own comparative study of 1 million images. This is possible because WebP's lossless codec uses more advanced prediction techniques, including spatial prediction of pixels, cross-color transforms, and a custom entropy coding scheme called VP8L. Unlike PNG's row-based DEFLATE filtering, WebP analyzes 2D pixel neighborhoods, making it inherently better at compressing complex photographic content while remaining fully lossless.

Web developers are the primary beneficiaries of PNG-to-WebP conversion. With WebP now supported by 97% of browsers globally (including Safari since version 16), it has become the default recommendation in Google's Lighthouse performance audits. A typical landing page with 8 PNG assets totaling 3.2MB can be reduced to 2.1MB in lossless WebP — saving over 1MB without any visual quality loss. CDNs like Cloudflare and Fastly now offer automatic WebP conversion, confirming its status as the modern web standard.

For images requiring transparency, WebP handles alpha channels with significantly better compression than PNG. A PNG-24 icon with transparency might weigh 45KB, while the equivalent lossless WebP version comes in at 28KB. WebP also supports lossy compression with transparency — a combination PNG cannot offer — enabling transparent hero images at a fraction of the original size. This makes WebP particularly valuable for UI kits, icon sets, and overlay graphics used in modern web applications.

One consideration is metadata handling. PNG supports extensive text chunks (tEXt, iTXt) for embedding copyright, descriptions, and color profile data. WebP has more limited metadata support through EXIF and XMP containers. If your workflow relies on PNG metadata for asset management or accessibility descriptions, verify that critical metadata survives the conversion. For archival purposes, keep your original PNG files and use WebP exclusively for delivery.

Pro Tips

  • Choose Lossless Mode for Graphics, Lossy for Photos

    WebP supports both lossy and lossless compression, unlike JPG. For UI elements, logos, and illustrations originally in PNG, use lossless WebP to maintain pixel-perfect quality at 26-34% smaller sizes. Switch to lossy WebP (quality 80) only for photographic PNGs where a 70-80% size reduction outweighs minor quality loss.

  • Provide a PNG Fallback for Legacy Systems

    While 97% of browsers support WebP, native desktop applications, older email clients, and some CMS platforms still cannot open WebP files. Use the HTML picture element with a PNG fallback source for maximum compatibility. This way modern browsers get the smaller file while legacy systems still render correctly.

  • Leverage WebP's Superior Alpha Compression

    WebP compresses transparency data far more efficiently than PNG. A set of 50 UI icons with transparency can shrink from 2.8MB total in PNG to 1.6MB in lossless WebP. For app icon sheets and sprite maps with alpha channels, this conversion alone can meaningfully improve initial load performance.

Frequently Asked Questions

Does WebP support transparency like PNG?

Yes, WebP supports alpha transparency. Your transparent areas are preserved during conversion.

Is WebP better than PNG?

For web use, WebP typically provides 25-35% smaller files than PNG while maintaining comparable quality. PNG may still be preferred for print or archival use.

Can all browsers display WebP?

Yes, all modern browsers support WebP including Chrome, Firefox, Safari 14+, and Edge. Only very old browsers lack support.

Is the conversion done on a server?

No. Everything runs locally in your browser using WebAssembly. Your images are never uploaded anywhere.