PNG to WebP Converter — Shrink Images for the Web

Drop PNG images here

or click to browse — each file converts to WebP on your device with the exact size saving shown next to it.

Choose images

Quality

0.850

Optimising a whole site's worth of images?

Kaizen builds offline-first Windows tools for exactly this kind of grind — Kaizen OCR & PDF batch-processes images and PDFs locally, with no cloud round-trips slowing you down.

See features

Also handy: Compress Image squeezes files without changing format.

Why WebP is worth it

Every major browser has supported WebP since 2020, and the size difference against PNG is dramatic: photographic PNGs routinely shrink 80–90%, flat graphics 50–70% — with transparency intact, something JPG can't offer. Smaller images mean faster Largest Contentful Paint, happier Core Web Vitals, and less bandwidth burned on mobile.

Reading the savings readout

Each converted file shows original → new size and the % saved. Use it to tune the quality slider: drop to 0.8, re-drop the file, compare. For most site imagery 0.80–0.85 is visually indistinguishable from the PNG; only zoom-in comparisons reveal the difference. If a file shows a small or negative saving, it was already tiny or extremely flat — keep the PNG.

Where to keep using PNG

Working masters you'll edit again — stay lossless until final export.
Print assets — print pipelines want PNG or TIFF, not web formats.
Pixel-perfect UI specs — designers comparing builds need exact pixels.
Legacy destinations — a few uploaders and email clients still reject .webp; when one does, run the reverse WebP to PNG converter.

A quick web-performance workflow

Resize to the largest size actually displayed (the Resize Image tool does this in-browser).
Convert to WebP here at quality 0.85.
Serve with <img srcset> or a <picture> fallback if you must support very old browsers.

Photos coming from a camera as JPG? Convert those with JPG to WebP — and for mixed batches in any direction, the general Image Converter does PNG, JPG and WebP both ways.

Frequently asked questions

How much smaller is WebP than PNG?

For photos, 80-90% smaller is typical at quality 0.85. Flat graphics and screenshots save 50-70%. The exact figure appears next to each file after conversion, so you never have to guess.

Does WebP keep transparency?

Yes — WebP supports full alpha transparency, so logos and cut-outs convert perfectly. This is WebP's big advantage over JPG for graphics.

Do all browsers support WebP in 2026?

Every current browser — Chrome, Safari, Firefox, Edge, Opera, and their mobile versions — has supported WebP for years. Only museum-piece browsers like Internet Explorer don't.

What quality setting should I use?

0.80-0.85 for site imagery, 0.90+ for photography portfolios where detail is the product. Below 0.7, fine texture starts to soften. Convert, inspect, adjust — the savings readout makes iterating quick.

Is this lossless like PNG?

The slider produces lossy WebP, which is where the big savings live. The visual difference at 0.85 is negligible for web use, but keep your PNG master if you'll edit the image again.