offlineconvert
png-to-webp
Your files never leave this device — 100% in-browser

PNG to WebP Converter

Convert heavy PNG assets to WebP — transparency included — without your files ever leaving the browser.

Heavy PNG screenshots and UI assets become lossy WebP at a fraction of the size, with transparency preserved — no white boxes. For pixel-exact needs (pixel art, technical imagery) stay with PNG; for web delivery, this conversion is nearly free bandwidth.

Last verified 2026-08-15 — this tool passed 79 automated end-to-end checks

→ JPG
quality 92%
⇪
Drop PNG images here, or click to browse
converts to WebP · batch supported · up to 100 MB each
01 — ALPHA KEPT
WebP supports full transparency, so logos and UI assets convert without white boxes appearing behind them.
02 — PRIVATE
Unreleased product shots and design assets are converted on your device. Nothing is uploaded to any server.
03 — INSTANT
No upload/download round-trip. Your browser already has the encoder; most images convert in well under a second.

How to use

  1. Drop your file(s) into the box above — or click it to browse.
  2. Conversion starts immediately; the tabs switch to a different output format. Adjust the quality slider to re-encode instantly.
  3. Click Download on each finished file — or Download all (.zip) for a batch. Nothing was uploaded at any point.

The PNG problem on the web

PNG earned its place through losslessness and transparency, but on the web it's frequently the wrong tool: a full-screen PNG screenshot easily weighs 1–3 MB, and a photographic PNG can be 10× the size of an equivalent WebP. Since every modern browser renders WebP, shipping PNGs today mostly just burns bandwidth and slows your Largest Contentful Paint.

The one thing to know: this tool produces lossy WebP at quality 0.92 — the variant with the big size wins. For photos and screenshots the difference from the PNG is imperceptible. For pixel-art or images where every pixel must survive exactly, stay with PNG or use a lossless-WebP pipeline instead.

PNG vs WebP at a glance
PNGWebP (lossy)
CompressionLosslessLossy (quality 0.92 here)
TransparencyYesYes — preserved by this tool
Screenshot, typical1–3 MB100–400 KB
Best forMasters, pixel-exact graphicsWeb delivery of the same graphics

Transparency survives

Unlike a PNG-to-JPG conversion, nothing gets flattened here: WebP carries a full alpha channel, so transparent logos, stickers and UI elements keep their transparent background — at a fraction of the PNG's size. This is the main reason PNG → WebP beats PNG → JPG for interface assets.

When NOT to convert PNG to WebP

  • Pixel-exact assets (sprites, pixel art, medical/technical imagery) — lossy WebP will smooth single-pixel detail.
  • Screenshots dense with small text that must stay razor-sharp — inspect the result before shipping; text is where lossy artifacts show first.
  • Files headed into design tools — Figma, Sketch and older Photoshop handle PNG far more predictably.
  • In Safari — Safari cannot encode WebP from canvas; use Chrome, Edge or Firefox for this page.

Frequently asked questions

Is the transparency really preserved?

Yes. WebP has native alpha support and the canvas encoder carries it through — no flattening, no white background.

Is this lossless WebP?

No — it is high-quality lossy WebP, which is where the dramatic size savings come from. Keep the PNG as your lossless master.

Why is my converted file barely smaller?

PNGs that are already tiny (icons, flat-color graphics) compress well in PNG form; WebP wins biggest on screenshots and photographic content.

Related conversions

JPG → WEBP WEBP → PNG PNG → JPG SVG → PNG HEIC → JPG TTF → WOFF