PNG to WEBP Converter

If you have ever run a page speed test and gotten dinged for "serve images in next-gen formats," this is usually what that message is pointing at. WEBP is a newer image format from Google that, in most cases, produces noticeably smaller files than PNG while still supporting transparency and looking essentially identical. PNG is not going anywhere, and there are still good reasons to keep it around, but for a lot of everyday use — website images, app assets, icons with transparent backgrounds — WEBP just gets the same job done with a lighter file. This tool takes your PNGs and converts them to WEBP without you needing to install anything or send a single file to a server.

You can drop in one image or a whole batch of them at once, up to twenty at a time. Each one gets converted separately, so you are not stuck waiting on a single huge job to finish before you can grab anything. Once the conversion is done, you can download files one at a time by clicking on them, or grab everything together as a single ZIP file if you are dealing with more than a couple of images.

The whole thing runs using your browser’s own image handling, the same canvas technology that already powers a lot of what you see on the modern web. That is actually worth mentioning because it means the conversion is not done by some server-side script guessing at settings on your behalf — it is your actual browser doing real WEBP encoding, the same encoder Chrome or Edge would use anywhere else. Nothing gets uploaded anywhere in the process. Your images stay on your device the entire time, get processed locally, and the download you receive at the end never touched a server.

There is a quality slider if you want more control. Lower settings shrink the file size further but start to introduce visible compression artifacts, especially on images with fine detail or text. Higher settings keep more of the original detail at the cost of a bigger file. Ninety percent of the time the default setting is a solid middle ground, but if you are working with something like a logo where text sharpness really matters, it is worth nudging the slider up and comparing the result before you commit to it.

Transparency is preserved automatically. If your PNG has a transparent background, the resulting WEBP will too — there is no separate toggle needed for that, it just works because the underlying canvas already understands alpha channels. After each conversion you will see the before-and-after file size along with a rough percentage showing how much smaller (or, rarely, how much bigger) the WEBP version turned out to be, so you are not just guessing whether the conversion was worth it.

This gets used for a lot of practical, slightly boring reasons, which is honestly the best kind of tool to have around. Site owners use it to shrink image assets before uploading them to speed up page load times. Developers use it to batch-convert icon sets or UI assets ahead of a build. Store owners convert product photos to keep a catalog page from feeling sluggish. None of that requires anything fancy, just a reliable way to turn a folder of PNGs into WEBP without fiddling with desktop software or waiting on an upload to a remote converter.

FAQ

Will my transparent PNGs stay transparent after converting to WEBP?
Yes. WEBP supports an alpha channel just like PNG does, and the conversion carries that transparency over automatically without any extra steps.

How many images can I convert at once?
Up to 20 PNGs per batch, each up to 10 MB. Each file converts on its own, and you can download them individually or bundle the whole batch into one ZIP.

What does the quality slider actually change?
It controls how much the WEBP encoder compresses the image. Lower values make smaller files but can introduce visible blur or blockiness, especially around sharp edges or text. Higher values keep more detail at the cost of file size. The default sits at a level that works well for most photos and graphics.

Is my image ever sent to a server during conversion?
No. Everything happens locally using your browser’s built-in canvas and image encoding features. Your files never leave your device.

Why is my WEBP file bigger than the original PNG in some cases?
This can happen with very small or very simple images, like tiny icons with only a few flat colors, where PNG compression was already close to optimal. For most photos and detailed graphics WEBP comes out noticeably smaller, but it is not guaranteed for every single image, which is exactly why the tool shows you the size comparison instead of just assuming it worked out.

Does this work in every browser?
It needs a browser with WEBP encoding support, which covers current versions of Chrome, Edge, and Firefox without any issue. If your browser cannot encode WEBP, the tool will let you know instead of silently failing.

Is there any cost or limit on how often I can use this?
No, it is free with no account needed and no cap on repeat use.

Drop your PNGs in above, adjust the quality if you want to, and you will have WEBP versions ready to download within a few seconds.