PNG’s web problem, WebP’s answer
Designers export PNG because it is lossless and supports alpha. Browsers then download 200 KB for a logo that could be 40 KB. Multiply that across icons, badges, and category thumbnails and you have a silent performance tax. WebP handles both lossy and lossless modes and, unlike JPEG, it can store an 8-bit alpha channel. That combination is why PNG to WebP is one of the highest-leverage conversions on a marketing site: you keep the cutout and you drop the weight.
This is not the same job as PNG to JPG. JPEG would fill transparent pixels with white or black and smear anti-aliased edges. WebP can keep the halo that makes a logo sit on any background. If your PNG is a photograph with no alpha, you will still usually win on size, but JPG to WebP or a straight compress may be simpler. The distinctive reason to be here is graphics with holes.
Lossy versus “looks lossless”
A 24-bit PNG of a simple logo contains a lot of redundant flat color. WebP can encode that almost losslessly at a fraction of the bytes. Busy illustrations, photographic cutouts, and PNGs with heavy drop shadows benefit more from a slight lossy pass—you will not notice the difference on a phone, and the file may shrink 50–80%. If you are shipping a brand mark that legal wants pixel-identical, compare zoomed-in edges before you replace the PNG everywhere. Keep the PNG in the design repo either way; WebP is a delivery format.
Indexed PNGs (8-bit palette) are already small. Converting those to WebP can go either way. Pixel art with a tiny palette sometimes prefers PNG or GIF. Always check the byte count instead of assuming WebP wins.
Older Outlook, some ebook readers, and a few social networks still dislike WebP. If the file is going into a Word header, an email signature, or a marketplace that lists PNG/JPG only, stay on PNG. If it is going into a Next.js or Shopify storefront, WebP is the default you want.
What happens on ToolPin
Conversion is in-browser. The PNG never uploads to toolpin.online. That is the right model for unreleased brand assets and app mockups. The cap is 250 MB per file. Very wide @3x marketing PNGs can stress memory; resize to the largest size you actually render (for example 2× the CSS width) before converting if a machine struggles.
Canvas encoding may flatten exotic PNG features: 16-bit channels, animation (APNG), and some color profiles. You get a still WebP with standard 8-bit color and alpha. No watermark is applied. No account is required.
Metadata in PNG is lighter than JPEG EXIF but can still include timestamps or software tags. Browser re-encode typically drops them. If you must publish a graphic with no residual tags, run Strip Image Metadata on a copy.
A delivery checklist
Use WebP for on-site images. Keep PNG for the source file, for print-adjacent PDFs, and for partners who cannot open WebP. For maximum compression on photographic cutouts, PNG to AVIF is the next step—AVIF can go smaller, with slower encode and the need for a WebP/PNG fallback. For email, do not switch until you have tested the client list. And never convert, then screenshot the WebP back to PNG “for quality”; you only add another generation of damage.