Why convert PNG to WEBP?
WEBP is Google's image format designed specifically for the web. For most images it produces files 25–80% smaller than PNG while looking the same to the human eye. Smaller images mean faster pages, lower bandwidth bills, and better Core Web Vitals scores — which Google uses as a ranking signal.
PNG vs WEBP: when each wins
| PNG | WEBP | |
|---|---|---|
| File size | Baseline | 25–80% smaller |
| Transparency | Full alpha | Full alpha |
| Lossless mode | Always | Yes, optional |
| Lossy mode | No | Yes |
| Browser support | 100% | ~97% (2025) |
| Editing software | Universal | Photoshop 23+, GIMP 2.10+ |
| Best for | Master files, editing | Web delivery |
How to convert PNG to WEBP
- Drop your PNG files — drag onto the upload zone, click to browse, or paste from clipboard. Up to 30 at once.
- Pick lossy or lossless — lossy at 85% is the web default; lossless if you need pixel-perfect output (UI assets, logos).
- Click Convert — encoding happens locally with the Canvas API. Your files stay on your device.
- Download — one by one, or all at once as a ZIP.
Quality settings: what to pick
- 95–100%: archival, master assets, or when downstream editing is expected.
- 80–90%: the web sweet spot — visually indistinguishable from the source for almost all images.
- 60–75%: aggressive compression for thumbnails or where bandwidth matters more than fidelity.
- Below 60%: visible artifacts on photos. Acceptable only for previews/placeholders.
Serving WEBP with a PNG fallback
~3% of users are still on browsers without WEBP support. Use the <picture> element to serve both:
<picture>
<source srcset="hero.webp" type="image/webp" />
<img src="hero.png" alt="..." />
</picture>PNG to WEBP for web performance
Switching from PNG to WEBP is one of the highest-ROI optimizations for image-heavy pages. A 400 KB PNG icon can drop to 80 KB as lossless WEBP. A 1.2 MB product photo PNG can shrink to 250 KB as 85% quality WEBP — a 79% reduction that eliminates multiple seconds of load time on mobile connections. Google Lighthouse flags "Serve images in next-gen formats" when it detects PNG files that could be WEBP, so converting is a direct path to a better Lighthouse score.
PNG to WEBP in Next.js and modern frameworks
Next.js's built-in next/image component auto-converts and serves WEBP when the browser supports it — no manual conversion needed if you have a Next.js server. Astro, Nuxt, and SvelteKit have similar built-in image optimization. If you are using static exports or a framework without automatic image optimization, pre-convert your PNGs to WEBP with this tool and reference the .webp files directly. Add a <picture> fallback to PNG for the ~3% of users on older browsers.
PNG to WEBP in WordPress
WordPress does not convert PNGs to WEBP automatically. Options: the free WebP Express plugin converts uploaded images on-the-fly and serves WEBP to supporting browsers with a PNG fallback. ShortPixel and Smush do the same with more configuration options. For a manual approach, convert PNGs here, upload the .webp files to the Media Library, and reference them directly in your content.
PNG to WEBP for transparent images
WEBP supports the same full 8-bit alpha channel as PNG. Logos, icons, cutout product images, and UI elements with transparent backgrounds all convert to WEBP with their transparency intact. The result is typically 25–35% smaller than the PNG using lossless WEBP, and up to 60–70% smaller using lossy WEBP — without any visible change to the transparency or the opaque areas of the image.
Privacy
Every byte stays in your browser. No upload, no temporary server file, no log. The conversion runs in a <canvas> element using the browser's built-in WEBP encoder.