Browser-only image tool
PNG to WebP Converter
Convert PNG images to WebP format and get 25–34% smaller file sizes while keeping full transparency support. Perfect for web developers optimizing Core Web Vitals. No upload, no signup.
How to convert PNG to WebP (3 steps)
- Drop your PNG files. Files stay in your browser — nothing is sent to any server. Multiple files and transparent PNGs are fully supported.
- Choose WebP quality. At 80%, you get files 25–34% smaller than PNG. Transparency (alpha channel) is always preserved in the WebP output.
- Download your WebP. The output has a .webp extension. Drop it into your website, CMS, or CDN — it renders identically to the original PNG in all modern browsers.
PNG vs WebP — size comparison
| Image type | PNG size | WebP size (est.) | Saving |
|---|---|---|---|
| Logo with transparency (400×200) | 80 KB | ~59 KB | ~26% |
| UI screenshot (1280×800) | 450 KB | ~300 KB | ~33% |
| Product photo PNG (800×800) | 380 KB | ~250 KB | ~34% |
| Icon with alpha (64×64) | 12 KB | ~9 KB | ~25% |
Estimates at lossless WebP. Lossy WebP can achieve even greater savings.
Why WebP improves Core Web Vitals
Google's Core Web Vitals measure page experience quality, and image payload is one of the biggest factors in Largest Contentful Paint (LCP) — a direct ranking signal. Every PNG image replaced with an equivalent WebP reduces the data the browser must download before rendering the page. A site with 10 PNG images averaging 400 KB each saves 1.3 MB per page load by switching to WebP. Faster pages rank higher, reduce bounce rate, and convert better. WebP support at 97%+ means no browser compatibility risk on modern sites.
When to keep PNG vs switch to WebP
- Switch to WebP for all images served on your website or web app — product images, blog photos, logos, icons, UI illustrations.
- Keep PNG for master source files used in design software (Figma, Photoshop, Affinity), print production, or archival storage.
- Keep PNG if your platform or CMS explicitly requires PNG format (some legacy upload portals).
- Keep PNG if you need to share editable source files with collaborators who may not have WebP-aware tools.
FAQ
Does WebP support transparency like PNG?
Yes — WebP fully supports alpha channel transparency. When you convert a transparent PNG to WebP, the transparency is preserved. WebP is a direct drop-in replacement for PNG on the web with significantly smaller file sizes.
How much smaller is WebP vs PNG?
Typically 25–34% smaller at equivalent quality. Lossless WebP is about 26% smaller than PNG for logos and icons. Lossy WebP on photographic images can achieve 34% or more reduction. Exact savings depend on image content.
Is WebP supported in all browsers?
Yes — Chrome, Safari (since 2020), Firefox, Edge, and all modern mobile browsers support WebP. Global support exceeds 97% in 2025. Internet Explorer 11 is the only unsupported browser, with essentially zero market share today.
Will the conversion reduce image quality?
Only if you choose lossy WebP. Lossless WebP is pixel-identical to the source PNG. For logos and UI assets, use lossless. For photos, lossy WebP at 80–90% is visually indistinguishable from the original.
Should I replace all my PNG files with WebP?
For web delivery, yes. Keep original PNGs for editing and archiving. Never use WebP as a master source file — PNG or uncompressed formats are better for editing workflows.