How much smaller will my file be after converting PNG to WebP?

WebP lossless compression is typically 25–34% more efficient than PNG. With lossy WebP at 80–90% quality, savings of 50–70% over PNG are common while maintaining excellent visual quality.

Is WebP supported in all browsers?

Yes. All major browsers support WebP: Chrome (since 2014), Firefox (since 2019), Safari (since iOS 14 and macOS Big Sur in 2020), and Edge. It is safe to use WebP for any modern web project.

Does converting PNG to WebP lose transparency?

No. WebP supports full alpha-channel transparency. Transparent PNGs are converted to transparent WebP, preserving your cutout subjects, logos, and icons.

Should I use lossy or lossless WebP?

For photos and complex images, lossy WebP at 80–90% quality gives the best size-to-quality ratio. For logos, icons, screenshots, and images with sharp edges or text, use lossless (set quality to 100%).

Can I use WebP in Next.js, Astro, or other frameworks?

Yes. Modern frameworks like Next.js, Astro, Nuxt, and SvelteKit have built-in image optimization that can serve WebP automatically. You can also convert your assets manually and reference them directly.

Yes. All conversion happens locally in your browser using the Canvas API. Your images are never uploaded to any server.

PNG to WEBP Converter — Free, Private, Browser-Based

Why Convert PNG to WebP?

PNG is an excellent lossless format — every pixel is stored exactly as encoded. But lossless storage comes with a price: PNG files are large. For web delivery, this directly affects page load speed, Core Web Vitals scores, and bandwidth costs.

WebP was designed by Google to solve exactly this problem. It offers:

25–34% smaller than PNG lossless for the equivalent lossless quality
50–70% smaller than PNG when using lossy WebP compression (at near-indistinguishable quality)
Full transparency support — WebP with alpha channel, just like PNG
Native support in all modern browsers — Chrome, Firefox, Safari, Edge

For web developers, converting PNG assets to WebP is one of the highest-leverage optimizations available. A 200 KB PNG served as a 90 KB WebP cuts load time by more than half for that asset, without any visible difference to the user.

When PNG to WebP Makes the Most Sense

Web publishing and content sites. If you manage a blog, e-commerce site, or any web property, replacing PNGs with WebP reduces page weight and improves Lighthouse scores. Google’s PageSpeed Insights explicitly flags large PNGs and recommends WebP.

Next.js, Astro, and modern frameworks. Most modern front-end frameworks can serve WebP automatically if you configure their image optimization components. Alternatively, convert your source assets to WebP and reference them directly for full control.

SVG alternatives for complex raster images. For complex screenshots, game assets, or UI illustrations that cannot easily be turned into SVG, WebP offers significant savings over PNG.

Product images in e-commerce. Product photos with transparent backgrounds (typical for white-background catalog images) can be served as WebP with alpha, replacing both the PNG original and any JPG fallback.

Email-embedded images (via CDN). If you serve images in HTML emails through a CDN, WebP-supported clients will load faster. Fallback PNGs can still be served to clients that don’t support WebP.

How This Converter Works

pixconv.io converts PNG to WebP entirely in your browser using the Canvas API:

Your browser decodes the PNG into pixel data.
The pixel data is drawn onto an offscreen HTML5 canvas, preserving the alpha channel.
The canvas exports the data as a WebP blob using canvas.toBlob('image/webp', quality).
The resulting WebP file is delivered to you as an immediate download.

No server, no upload, no processing queue. Conversion happens locally on your device in milliseconds.

Lossy vs. Lossless WebP

The quality slider controls whether the output is lossy or near-lossless WebP:

100% — Lossless WebP. Every pixel is preserved exactly. Best for logos, icons, UI screenshots, and images with text or sharp geometric shapes. Files are larger than lossy but smaller than equivalent PNG.
80–95% — Lossy WebP with excellent quality. Ideal for photographs and complex imagery. The difference from lossless is imperceptible in most cases. Files are 50–70% smaller than PNG.
60–79% — Lossy WebP with noticeable compression. Useful for thumbnails, previews, and background images where perfect fidelity is not required.

For most web use cases, 85% is a good starting point — it produces files that look identical to the PNG original on screen while cutting size by 50–60%.

Step-by-Step Guide

Step 1 — Add your PNG files. Drag and drop one or more PNG images into the drop zone, or click “Browse files.” You can add as many as you need in one batch.

Step 2 — Set quality. Use the quality slider to choose your compression level. For most web images, 85% offers an excellent size/quality balance. For icons and logos, 100% (lossless) preserves sharp edges.

Step 3 — Download. Click Download next to each converted file, or Download all as ZIP when you have multiple files ready.

Privacy and Security

Your images are processed entirely on your device. pixconv.io does not upload, store, or log your files. No login is required.

Tips for Best Results

Transparent PNGs. The alpha channel is preserved automatically — you do not need to do anything special. Check the output with a transparency checker if precision matters.
Screenshots and UI assets. Use quality 100% (lossless WebP) for screenshots with text, code, or UI elements. Lossy compression introduces visible artifacts on sharp edges.
Batch optimize a folder. Drop an entire directory’s worth of PNG files at once. The converter queues them sequentially to keep memory usage stable.
Check browser support for your audience. WebP is supported by 97%+ of global browsers as of 2024. If you need to support very old browsers (IE 11, old Safari), keep PNG fallbacks alongside WebP.
Serving WebP with HTML picture element. For maximum compatibility in legacy environments, serve WebP with a PNG fallback: <picture><source type="image/webp" srcset="image.webp"><img src="image.png"></picture>