Lumagely
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Convert PNG to WebP

Shrink PNGs dramatically by converting them to WebP — transparency intact, often 60–80% smaller. Right in your browser, no uploads.

  • No uploads — 100% on-device
  • Fast in-browser processing · WASM codecs
  • Unlimited files · up to 256MB each

Drop images here

or Browse files

Tip: paste images directly with Ctrl+V

HEIC · PNG · JPEG · WebP · AVIF · GIF · SVG

WebP delivers the same transparency as PNG at a fraction of the size, which is why it’s the go-to format for fast websites. Lumagely re-encodes your PNGs to WebP locally with WebAssembly codecs — no upload, whole batches at once.

How to convert PNG to WebP

  1. 1Drop your PNG files in.
  2. 2WebP is already the selected output; pick Lossless if you need a perfect copy.
  3. 3Download the WebP files, or a ZIP of the batch.

Good to know

  • WebP supports transparency, so alpha channels are preserved.
  • Set quality to 100 for truly lossless WebP, or lower it for the smallest files.
  • Every modern browser supports WebP.

PNG to WebP — questions

How much smaller is WebP than PNG?

For typical graphics WebP is 60–80% smaller than PNG at the same visual quality, with transparency preserved.

Does WebP keep transparency?

Yes. WebP fully supports alpha transparency, just like PNG.

Can I convert WebP back to PNG?

Yes — use the WebP to PNG tool to go the other way.

Everything you can do

A complete image toolkit — compress, convert, resize, crop, rotate and watermark — all running privately in your browser.

  • Smart compression

    Shrink PNG, JPEG, WebP and AVIF with WebAssembly codecs — Smart Auto, lossy, near-lossless or fully lossless.

  • Target file size

    Set a limit in KB and Lumagely finds the best quality that fits — ideal for upload caps and email attachments.

  • Convert & HEIC to JPG

    Convert between PNG, JPEG, WebP and AVIF, turn iPhone HEIC photos into JPG, and modernize old GIFs.

  • Resize, crop & rotate

    Resize by pixels or percentage, crop to any aspect ratio, and rotate or flip — across the whole batch.

  • Batch watermark

    Stamp a text or logo watermark onto every image, with full control over position, size, opacity and margin.

  • Private & offline

    Everything runs on your device in Web Workers — no uploads, no sign-up, and it keeps working offline.

Supported formats

Compress, convert and optimize the formats the modern web runs on.

  • HEIC

    Convert iPhone HEIC photos to JPG, PNG, WebP or AVIF.

  • PNG

    Lossless compression with OxiPNG.

  • JPEG

    High-quality photos with MozJPEG.

  • WebP

    Smaller photos & graphics, lossy or lossless.

  • AVIF

    Next-gen format with the best compression for photos.

  • SVG

    Minify vectors, or trace raster images into SVG.

  • GIF

    Convert GIFs to modern, smaller formats.

Why Lumagely?

100% private

Your images are processed on your device and never uploaded to any server.

Fast & modern

WebAssembly codecs (MozJPEG, OxiPNG, libwebp, libavif) run at near-native speed in your browser.

Free & unlimited

No sign-up, no forced watermarks, no limits — optimize as many images as you like.

Browser-based vs. upload-based

Typical upload tools

  • Images are uploaded to a server
  • Sign-up or usage limits are common
  • Often split across separate tools
  • Privacy depends on the provider

Lumagely

  • Images stay on your device
  • No sign-up — unlimited files
  • Compress, convert, resize and social export in one place
  • Private by design — nothing leaves your browser

More image tools

One-tap tools for the most common image jobs — all free, all in your browser.