PNG to WEBP Converter
Convert PNG images to WEBP and keep what makes PNG useful — including transparency — at a dramatically smaller file size. Upload your PNG below and download an optimized WEBP seconds later.
This is the go-to conversion for web developers: logos, icons, screenshots and UI images that were traditionally PNGs can usually ship as WEBP at 50–80% smaller with no visible difference.
How the PNG to WEBP conversion works
Filembly decodes your PNG and re-encodes it as WEBP at your chosen quality (default 85). Crucially, WEBP supports an alpha channel, so transparent and semi-transparent regions survive the conversion intact — unlike converting to JPG, where transparency is flattened to white.
How to convert PNG to WEBP
- Upload your .png image above.
- Confirm WEBP as the destination; tweak the quality slider if you want.
- Click Convert.
- Download the WEBP — transparency included.
Limitations to know about
- The default conversion is lossy (that's where the size savings come from). At quality 85+ the difference is invisible for almost all images, but pixel-critical work like medical imaging should stay lossless.
- A few older desktop applications still can't open WEBP files, though all modern browsers can.
Privacy and security
Your file is uploaded over HTTPS, converted entirely in memory and streamed straight back to your browser. It is never written to disk, never logged and never retained after the conversion — there is nothing to delete because nothing is stored. Files are validated by extension, type and content signature, and uploads are never executed. Read more in our privacy policy.
Frequently asked questions
Does WEBP keep my PNG's transparency?
Yes — WEBP fully supports alpha transparency, including partial (semi-transparent) pixels. This is the key advantage over converting PNG to JPG, which flattens transparency onto a white background.
How much smaller is WEBP than PNG?
For typical web graphics — logos, screenshots, UI images — expect 50–80% smaller files at visually identical quality. Photographic PNGs shrink even more dramatically since PNG is a poor fit for photos to begin with.
Is the conversion lossless?
Filembly uses lossy WEBP encoding at your chosen quality, which is what produces the large size savings; at the default of 85 the result is visually indistinguishable for normal use. If you require mathematically identical pixels, keep the original PNG as your master copy.