PNG → WebP

This free online PNG to WebP converter batch-converts PNG files to WebP while automatically keeping transparency intact — the one thing converting a transparent PNG to JPG can never do — and adds a drag-to-compare slider on every file so you can visually confirm the size savings didn't cost you anything you can actually see.

PNG is lossless, which is exactly right for logos, icons and graphics, but it means the files are often far larger than they need to be — WebP can typically compress the same image significantly smaller while still supporting the same full transparency PNG does. That combination — real compression plus kept transparency — is something JPG structurally cannot offer, which makes WebP the more capable modern replacement for PNG in almost every situation where file size matters: product thumbnails with a transparent background, icon sets, UI graphics, or any transparent image destined for the web. Smaller images mean faster page loads, and Google's Core Web Vitals — a direct ranking factor — reward exactly that, so converting a folder of transparent PNGs to WebP before uploading is a quick, concrete win for page speed and search ranking.

Because compression on a lossy format like WebP is still a trade-off, every file gets a magnifier button that opens a before/after slider comparing the original PNG against the WebP result — drag across fine edges and transparency boundaries to confirm the cutout and detail both held up at your chosen quality, rather than trusting the file-size number alone. The quality slider and live per-file savings readout let you dial in the right balance across the whole batch, from an aggressive smallest-file preset up to a near-lossless setting when quality matters more than a few extra kilobytes.

Every conversion, alpha check and comparison happens locally in your browser using the HTML canvas API — nothing is ever uploaded to a server, so it's instant, works identically on a phone or a laptop, and is completely private.