PNG to WebP Converter

How to Convert PNG to WebP in 3 Steps

Converting PNG to WebP is quick, and the tool above does it without uploading anything. What makes this page different is that you see the payoff — the smaller size — before you commit to the download.

Here are the three steps.

1. 01
   Add your PNG

   Drag it in, click to browse, or paste with Ctrl+V. Add up to 50 files at once — nothing is uploaded, and the conversion starts on your device the moment the file lands.

2. 02
   Set quality, or go lossless

   Move the quality slider and the size updates live, so you can trade a few kilobytes for a little detail and see the result immediately. For crisp graphics, flip to Lossless instead.

3. 03
   Download your WebP

   The number in the meter is the file you get — click Download WebP and it saves. Transparency is carried over, and a batch downloads as one zip.

See How Much Smaller in Real Time

This is the part every other PNG to WebP converter skips. They let you pick a quality, convert, download, and then leave you to compare file sizes in your file manager.

That loop is slow and it hides the one fact you actually care about: did this help, and by how much? A PNG to WebP conversion is only worth doing if the file gets meaningfully smaller, and you should be able to see that answer before you commit.

Move the slider, watch the size

Here the size updates as you drag: 1.4 MB becomes 320 KB, and the meter says −77% before you download a thing.

The number in the meter is the exact WebP you will get, for your image, at your setting. So you can stop guessing what "quality 80" means and just watch it happen.

Drop 20 PNGs in and each one shows its own meter, because the right quality for a screenshot is not the right quality for a photo. Converting PNG to WebP one blind setting for the whole batch is how you end up with fuzzy text on some files and bloat on others.

When WebP won't actually help

WebP is not always smaller. A tiny, flat PNG — a simple logo, a two-colour icon — is already about as small as it gets, and its WebP twin can come out bigger.

When that happens, the meter says so plainly and suggests you keep the PNG. An honest "this won't help" beats a conversion that quietly made your file larger.

Lossless vs Lossy WebP: Which Should You Pick?

WebP comes in two flavours, and picking the right one is most of the job. The good news is that the picture usually decides for you.

What the quality slider really does

The default slider is lossy: it makes the file smaller by dropping detail your eye barely registers. Lower quality means a smaller file and, eventually, visible softness.

The Lossless switch is different — it keeps every pixel exactly and ignores the quality number entirely. It compresses less than aggressive lossy, but for the right image it is both perfect and small.

One surprise catches people out: lossless is not always the bigger option. For a screenshot or a logo, a lossless PNG to WebP conversion frequently beats the original PNG on size while changing nothing at all. Lossless does not mean uncompressed — it means no detail is discarded.

A simple rule you can follow

Screenshots, UI, and line art

Anything with sharp edges, flat colour, or text belongs in lossless — or lossy at quality 90 or above. Aggressive lossy frays crisp edges and makes small text look fuzzy.

Photos, gradients, and decoration

Smooth tones hide compression well, so lossy at quality 75–85 is the sweet spot. You get a large size cut with no difference most people can see. This is where converting PNG to WebP pays off the most.

A photo saved as PNG is the worst of both worlds: large, because PNG never throws anything away, and unnecessary, because no one needs a pixel-perfect copy of a photograph. That is the classic case for a lossy PNG to WebP conversion — the file shrinks dramatically and looks the same.

If you are unsure which flavour fits, try both. The meter re-encodes the moment you flip the switch, so comparing lossless against lossy for the same PNG takes one click, not two round trips through a server.

Does WebP Keep PNG Transparency?

Yes — and this is one of the best reasons to convert PNG to WebP rather than to JPEG.

Full alpha, preserved

WebP supports the same 8-bit alpha channel PNG does. Soft shadows, anti-aliased edges, and fully transparent backgrounds all survive. Nothing is flattened onto a white box.

A transparent WebP is smaller than a transparent PNG

A transparent PNG is often the single heaviest asset on a page. Its WebP version looks identical and weighs a fraction as much — which is exactly why browsers started shipping WebP in the first place.

Will Converting PNG to WebP Lose Quality?

Only if you tell it to, and only by as much as you allow.

Quality is a dial, not a switch

At high quality, a lossy WebP is visually identical to the PNG for almost everyone. At low quality, you trade sharpness for size. Choose Lossless and the answer is simple: no quality is lost, the file is just larger than it would be lossy.

Where lossy WebP shows its seams

Push the quality down and the first things to suffer are hard edges and text, which pick up a faint ringing. That is the reason for the rule above: reach for lossless when the image is built from sharp lines, and lossy when it is built from smooth tones.

Why Convert PNG to WebP?

The reason is almost always speed. WebP exists to make images on the web smaller without looking worse.

Faster pages and Core Web Vitals

Images are usually the heaviest thing a page loads, so smaller images mean a faster load and a better Largest Contentful Paint. If you are chasing a PageSpeed or Core Web Vitals score, converting PNG to WebP is one of the highest-leverage changes you can make.

A hero image or a product shot dropping from 1.4 MB to a few hundred kilobytes is felt on every visit, especially on mobile connections. That is the practical reason most people search for a PNG to WebP converter in the first place: the PNGs on their site are simply too big.

Icons, exports, and design handoffs

It is not only websites. Design tools and asset pipelines increasingly prefer WebP, so converting PNG to WebP keeps exports light without giving up transparency. And because this runs locally, you can do it to a whole folder of assets without sending any of them anywhere.

Browser support is basically universal now

WebP is supported by roughly 96% of users — Chrome 32+, Firefox 65+, Safari 16+, and Edge 18+. The old reason to avoid it is gone; for the rare ancient browser, a PNG fallback covers the gap.

Private by Design: Nothing Is Uploaded

Every conversion on this page runs locally. The PNG is decoded and re-encoded as WebP in your browser — it is never sent to a server.

Because there is no upload, the tool works offline, there is no queue, and there is no size cap pushing you toward a paid plan.

How to check we're telling the truth

Open your browser's developer tools, switch to the Network tab, and convert a PNG to WebP — you will not see your file leave. Or turn off your Wi-Fi and try again; it still works. That is what "in-browser" should mean.

For sensitive work — unreleased designs, client assets, internal screenshots — that guarantee matters more than a few kilobytes. A local PNG to WebP converter lets you shrink those files without ever handing them to someone else's server.

Frequently Asked Questions

More Free Converter Tools

This PNG to WebP converter is part of a family of free, in-browser tools on pngconvert.net — including its mirror image, the WebP to PNG converter. No accounts, no uploads: