Offcloud guide
PNG to WEBP converter: lighter images for a faster website
PNG files look great, but they can weigh down your web pages. Offcloud converts your PNGs to lightweight WEBP images for free, directly in your browser. Nothing is uploaded, no account is needed, and the result is often dramatically smaller.
Why convert PNG to WEBP?
PNG is a dependable format for screenshots, logos, and graphics with sharp edges, but that reliability comes at a cost: file size. WEBP delivers comparable visual quality at a fraction of the file size, which is why it has become one of the standard formats for images on the modern web. If your pages are full of PNG assets, converting them to WEBP is one of the easiest optimizations you can make.
For site owners, the payoff is concrete. Lighter images mean faster load times, a better Largest Contentful Paint score, and stronger Core Web Vitals overall — factors that shape both user experience and search visibility. Visitors on mobile connections feel the difference immediately, and every megabyte saved is bandwidth you no longer have to serve.
No upload, no server: how the conversion runs
Offcloud takes a different approach from most online converters: your image never leaves your computer. The conversion runs entirely in your browser using WebAssembly, so there is no upload, no server-side processing, and nothing stored online. When you close the tab, nothing remains — your files were never in anyone else's hands to begin with.
That architecture also removes the usual friction. There is no signup, no account, no watermark, and no fee. And because no server is involved, there is no arbitrary file-size cap either: the only practical limit is your device's memory, and Offcloud works in any modern browser on desktop or mobile.
What actually gets smaller — and what doesn't
One honest caveat: no conversion can improve on the original, and PNG to WEBP is no exception. What WEBP does well is preserve how an image looks while cutting its file size — a blurry screenshot will still be a blurry screenshot, just a much smaller one. Savings also vary from image to image: flat graphics and screenshots typically shrink the most, while files that are already well optimized see smaller savings.
Our advice for site owners: treat WEBP as your delivery format and keep the PNG originals as your masters, so you can always re-export later if standards change. Very large images simply take a little longer to process locally, so let the conversion finish rather than reloading the page. And as always, only convert images you own or have the rights to use.
Conversion steps
- Open Offcloud in your browser and select your PNG file, or drag and drop it straight onto the page.
- Choose WEBP as the output format for your image.
- Wait a moment while the conversion runs entirely in your browser — your PNG is never uploaded anywhere.
- Download your new WEBP file and compare its size with the original.
Frequently asked questions
How much smaller will my WEBP file be compared to the PNG?
It depends on the image, but the reduction is often substantial — screenshots, logos, and flat graphics tend to shrink the most. Visual quality remains comparable, though results vary from file to file.
Do all browsers display WEBP images correctly?
Yes. Every modern browser — Chrome, Firefox, Safari, and Edge — has supported WEBP for years, which is why it has become a standard format for web images.
Is the PNG to WEBP conversion really free?
Yes, completely. There is no account to create, no hidden fee, and no watermark added to your converted images.
Are my PNG files uploaded to a server during the conversion?
No. The entire conversion happens locally in your browser, so your images never leave your device and nothing is stored online — before, during, or after.
Can I convert a very large PNG, like a full-page screenshot?
Yes. Offcloud imposes no file-size limit because there is no server involved; the only constraint is your device's memory. Very large files simply take a little longer to process.