Convert PNG to WebP Online

Convert PNG files to WebP lossless — 26% smaller files with full transparency support, right in your browser. Free, private, no upload.

Convert PNG to WebP Free →Free · No signup · No upload

PNG is a great format for images with transparency, but it produces large files. Converting PNG to WebP lossless typically reduces file size by about 26% while preserving every pixel — including transparency. For web assets like logos, icons, and UI graphics, WebP is the modern, high-performance replacement for PNG. Resizor makes the conversion instant, private, and free.

The conversion runs entirely in your browser via WebAssembly (wasm-vips) — no server, no upload. Lossless WebP preserves the alpha channel so your transparent backgrounds convert perfectly. If you're converting photo-like PNGs without transparency, lossy WebP will give you even smaller files. Batch convert entire folders of PNGs and download them all as a ZIP.

How It Works

Upload Your PNG

Drop one or more PNG files into the tool — including PNGs with transparent backgrounds.

Select WebP Output

Choose WebP. Use lossless mode to preserve transparency and every pixel, or lossy for smaller files.

Download WebP Files

Download your converted WebP images — smaller files, transparency intact, ready for the web.

Why Choose Resizor?

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Fully Private

Conversion runs entirely in your browser with WebAssembly. Your images never leave your device.

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Transparency Preserved

WebP lossless fully supports alpha channel, so transparent PNGs convert perfectly.

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26% Smaller Than PNG

WebP lossless is typically 26% smaller than equivalent PNG with identical pixel-perfect quality.

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Free, No Limits

Batch convert unlimited PNG files to WebP — no account, no watermarks, completely free.

Frequently Asked Questions

Does WebP support PNG transparency?

Yes. WebP lossless supports full alpha channel transparency, just like PNG-24. Your transparent backgrounds, drop shadows, and semi-transparent overlays will all convert correctly.

Is WebP lossless smaller than PNG?

Yes, typically by about 26%. WebP lossless uses more advanced compression algorithms than PNG's DEFLATE compression, resulting in smaller files at identical quality.

When should I use WebP lossy vs lossless for PNG conversion?

Use lossless WebP when converting logos, icons, screenshots, or any image with sharp edges or transparency where pixel accuracy matters. Use lossy WebP when converting photo-like PNGs to achieve even smaller file sizes.

Can I batch convert PNGs to WebP?

Yes. Drop multiple PNG files into Resizor and they'll all be converted at once. Download the results individually or as a ZIP file.

Will all browsers display my WebP images?

Yes. All modern browsers including Chrome, Firefox, Edge, Safari (14.1+), and Opera support WebP. It's safe to use on any modern website.

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