PNG to WebP Converter

How it actually works

WebP is worth understanding before you convert. It is a prediction-based format from the VP8 video codec family: instead of compressing each block independently the way JPEG does, it predicts a block from its neighbours and stores only the difference, which is why it typically reaches the same visual quality at roughly 25 to 35% fewer bytes.

This tool decodes each PNG you drop in, up to 20 files at 10MB each, paints it onto a canvas and re-encodes it with canvas.toBlob using image/webp plus your quality value, from 0.1 to 1 with a default of 0.85. The alpha channel is carried through the canvas, so transparency survives. Optional width and height fields resize in the same pass, and a batch downloads as one ZIP.

What that means for your results

Lossy WebP with alpha is one of the best trades available on the modern web: a transparent logo or product cut-out at 85% is often a third the weight of the PNG it came from, and the eye rarely objects. Flat colour regions stay clean, and edges keep their softness instead of the halo a palette-reduced GIF would produce.

Be aware that lossy alpha is not perfectly transparent at the very edge, so a thin dark fringe can appear against a light page background on tightly cropped artwork. If that shows up, nudge the quality up or keep that one asset lossless.

Canvas WebP encoding is a browser capability, and older Safari releases never implemented it, so confirm the output actually opens in the browser you work in.

Where it falls short — honestly

Converting a PNG to lossy WebP is generation loss. The pixels are quantised and the original data is discarded, so keep the PNG as your master and treat WebP as a delivery copy. If the file has fewer than about 256 colours, a well-optimised PNG can rival WebP anyway, so compare both before you commit.

Animation is out of scope: an animated PNG or a GIF belongs in GIF Maker instead, and documents that must print exactly should go to Image to PDF rather than a raster web format.

A real end-to-end workflow

The typical web-performance job: cut the background out in Background Remover, export the transparent PNG, size it to the real display width in Image Resizer, then convert here at 85% and serve it with a fallback so no visitor gets a broken image.

For a logo that must be razor sharp at small sizes, convert at 95% or keep the PNG, and generate the tiny tab-bar versions separately in Favicon Generator, where several fixed sizes come out of one upload.