Convert PNG to WEBP Online Free

Q: How much smaller is WEBP compared to PNG?

WEBP files are typically 25-35% smaller than equivalent PNG files with no visible loss in quality. For a 5 MB PNG image, you can expect the WEBP version to be around 3-4 MB. The savings are even more dramatic for photographs, where WEBP's lossy mode can achieve much higher compression.

Q: Does WEBP support transparency like PNG?

Yes. WEBP fully supports alpha transparency, just like PNG. When you convert a PNG with transparent areas to WEBP using AllConvert, the transparency is perfectly preserved. This makes WEBP an excellent replacement for PNG on websites.

Q: Do all browsers support WEBP images?

Yes, all modern browsers including Chrome, Firefox, Safari, and Edge support WEBP. Safari added support in version 14 (2020). The only browsers that do not support WEBP are Internet Explorer and very old versions of Safari, which together represent less than 1% of web traffic.

Want smaller image files without sacrificing quality or transparency? AllConvert converts your PNG images to WEBP format instantly in your browser. No upload, no account, no software to install. Your files never leave your device.

Why convert PNG to WEBP?

WEBP is a modern image format developed by Google that delivers significantly smaller file sizes than PNG. On average, a WEBP file is 25-35% smaller than an equivalent PNG with no visible difference in quality. For website owners, this translates directly to faster page loads, lower bandwidth costs, and better Core Web Vitals scores. Google explicitly recommends serving images in WEBP format for optimal web performance, and Google PageSpeed Insights will flag PNG and JPG images as opportunities for improvement.

Transparency preserved

One of the biggest advantages of WEBP over JPG is that WEBP supports alpha transparency, just like PNG. When you convert a PNG logo, icon, or graphic with transparent areas to WEBP, the transparency is fully preserved. This means you can replace every PNG on your website with WEBP without worrying about losing transparent backgrounds. The result is the same visual appearance at a fraction of the file size.

Ideal for web optimization

If you run a website, blog, or online store, converting your PNG images to WEBP is one of the easiest performance wins available. Every major browser now supports WEBP, including Chrome, Firefox, Safari, and Edge. For the rare visitor using an unsupported browser, you can use the HTML picture element to provide a PNG fallback. AllConvert makes the conversion effortless: drop your files, convert, and your optimized WEBP images are ready to use.

How to convert

Drop your PNG into the converter box at the top of this page, or click it to browse.
The WEBP is encoded on the spot — the conversion runs on your device, not a server.
Click the download button that appears and save your new WEBP file.

The entire process runs locally in your browser. Nothing is uploaded, and there are no file size limits beyond your device's memory. It works on desktop and mobile, in Chrome, Firefox, Safari, and Edge.

Other formats? The main converter handles 60+ conversions

Lossless doesn't mean same size

Most conversions on this site trade some quality for a smaller file. PNG to WEBP is unusual, because WEBP has its own lossless mode, built on a different prediction and entropy-coding scheme than PNG's DEFLATE, and it typically packs the same pixel data tighter. So a lossless WEBP can be pixel-for-pixel identical to the source PNG and still come out noticeably smaller — no artifacts, no color shift, just a more efficient container for the same lossless data. That's separate from WEBP's lossy mode, which trades a bit of quality for even bigger savings, the way JPEG does.

Frequently asked questions

How much smaller is WEBP compared to PNG?
Typically 25-35% smaller with no visible quality loss — a 5 MB PNG often becomes roughly 3-4 MB as WEBP. Photos can shrink further using WEBP's lossy mode.

Does WEBP support transparency like PNG?
Yes, fully. Converting a PNG with transparent areas to WEBP keeps the alpha channel intact, which is why WEBP works as a drop-in replacement for PNG on the web.

Do all browsers support WEBP images?
Yes, every modern browser does — Safari added support in version 14, back in 2020. Only Internet Explorer and very old Safari versions lack it, a sliver of traffic today.