PNG to WebP Converter

A PNG to WebP converter re-encodes a .png as a .webp to cut the bytes a page has to send. PNG is lossless, which is exactly what you want while you are making an image and exactly what you do not want when a browser is downloading it. A hero image, a screenshot or a product shot kept as PNG carries every pixel faithfully and charges the visitor for the privilege. WebP was designed to be the web delivery format instead, which is why page-weight audits keep pointing at the PNG files.

Conversion here is client-side. The PNG is decoded and re-encoded by your own browser, so nothing is uploaded, and a folder of assets can be converted without handing a client project to a third party.

Work through one. A 1920 x 1080 screenshot is 2,073,600 pixels, and PNG has to describe every one of them without approximating, which is how a plain screenshot ends up in the megabytes. Drop it here and it converts straight away at the default Quality of 90. The row prints the PNG size, an arrow, the WebP size and the percentage change, so the saving is a number you read rather than a claim you take on trust. Move the slider to 70 and the file converts again, so you can compare the two sizes before you decide what to ship.

On the question people ask most: the Quality slider runs from 10 to 100 and 100 asks the browser encoder to keep as much detail as it can, but the output is whatever that encoder produces and is not guaranteed to be a bit-exact copy of the PNG. Treat the PNG as the master and the WebP as the delivery copy. Transparency does come through intact, so cut-outs and logos keep their alpha channel instead of gaining a white background.

WebP is also the wrong answer sometimes, and it is cheaper to know that now. Email attachments, print shops, older CMS installs, Word documents going to a client and desktop tools that predate the format will all be happier with a PNG or JPG. An animated PNG is treated as a still here, so the output does not animate. EXIF, GPS coordinates and colour profiles are dropped in the re-encode. Images over 100 megapixels are refused with a message, empty files are refused, there is no byte-size limit, and a daily conversion limit applies. The tool is free, no signup.

• PNG files are decoded and re-encoded as WebP client-side by the browser's Canvas API. Unreleased designs and client assets are never uploaded.
• The pre-batch limit check sends the tool name, a device identifier and, if you are signed in, your account token. It carries no image data.
• The usage record sent after a batch contains a file count, a total size in bytes and the output format, never file names or pixels.
• The conversion does not depend on that request succeeding, so it keeps working offline once the page has loaded.
• EXIF fields, GPS coordinates and embedded colour profiles are not carried into the WebP, which also trims a little weight you were not using.
• Converted files stay in the tab's memory until you remove them, press Clear All or close the page.