Convert PNG to WebP online while preserving transparency and cutting size. Batch conversion, processed locally.
TL;DR: Free PNG to WebP converter: keeps transparency while shrinking files, batch and local.
This tool runs entirely in your browser. Open DevTools → Network panel and search your input — it appears in no request.
使用指南
Convert PNG to transparency-preserving WebP: transparent images often shrink 50-70% (PNG alpha compression is famously poor). Batch, local, zero upload — the first pick for web asset diets.
1. Conversion flow
- Drop PNG images (transparent or opaque).
- Quality defaults to 90%; push to 80% for extreme sizes.
- Compare and download in one click.
2. The transparency size miracle
PNG uses lossless deflate even with alpha — fine for flat screenshots, but gradient/photo PNGs with transparency easily run multi-MB. WebP lossy-with-alpha typically lands at a third of the size at equal visual quality. Batch-converting decorative PNGs to WebP is an immediate site performance win.
3. When not to convert
- Pixel-perfect assets (medical imaging, technical comparisons) should stay PNG — lossy WebP changes pixel values.
- Images headed for WebP-blind legacy systems stay PNG or become JPG.
FAQ
Yes. WebP natively supports alpha; transparent PNG areas stay transparent.
Transparent images typically shrink 50-70% (PNG compresses alpha poorly); opaque photos about 25-35%.