Image

How to Convert PNG to WebP

Dev Nexus4 min read

A step-by-step guide to converting PNG images to WebP for smaller, faster web pages, right in your browser.

PNG is a fantastic format for logos, icons, and screenshots, but its files are heavy. Ship a page full of PNGs and your load times suffer. WebP was built to fix exactly this - it delivers the same crisp images, including transparency, at a fraction of the size.

This guide walks you through converting PNG to WebP online, in just a few clicks. It runs entirely in your browser, so even a private image never leaves your device.

The Problem

PNG uses lossless compression, which keeps every pixel perfect but makes files large - a single full-width screenshot can weigh a megabyte or more. On a page with several images, that adds up fast, slowing your site and hurting Core Web Vitals scores that search engines care about.

You could compress the PNGs, but lossless compression only goes so far. What you really want is a format that keeps the quality and transparency of PNG while cutting the byte count dramatically - without uploading your assets to a server you do not control.

The Solution

The fix is to convert your PNGs to WebP. WebP supports both lossless and lossy modes plus transparency, and it typically produces files undefined to undefined percent smaller than PNG at the same visual quality. The Image Converter does this locally: it reads your PNG, re-encodes it as WebP, and hands you the smaller file.

Because the conversion runs in your browser, nothing is uploaded - safe for unreleased designs and internal assets. The result drops straight into your site or app. If you want to squeeze out even more, run the WebP through Compress Image afterwards.

Step-by-Step Guide

1
Open the tool and add your PNG
Go to Image Converter and drop your PNG onto the drop zone, or click to browse for it. The file loads instantly and stays on your device - nothing is sent to a server.
2
Choose WebP as the output
Select WebP as the target format. Your transparent PNG keeps its transparency because WebP supports an alpha channel, unlike JPG.
3
Set the quality
For photographic or complex images, a lossy WebP around quality undefined gives a big size drop with little visible change. For flat graphics and text, a higher setting keeps edges crisp.
4
Convert and download
Run the conversion and save the WebP file. Compare it to the original PNG - you should see a noticeably smaller file with the same appearance.
5
Add a fallback if needed
If you support very old browsers or email clients, keep the original PNG as a fallback and serve WebP to everyone else using the picture element or your CDN.

Common Mistakes

Cranking quality too high or too low
Maxing out quality gives files barely smaller than the PNG; setting it too low introduces visible artifacts. Around undefined is a good starting point for most images.
Forgetting a fallback for old software
WebP works in every modern browser, but some legacy apps and email clients cannot open it. Keep a PNG or JPG fallback where compatibility matters.
Converting text-heavy graphics with lossy WebP
Lossy compression softens sharp edges. For screenshots with fine text or flat icons, use lossless WebP or a higher quality setting to keep edges clean.
Uploading unreleased assets to random converters
Many online tools send your file to a server. For unpublished designs or internal graphics, use a browser-based converter like Image Converter that keeps files on your device.

Frequently Asked Questions

How do I convert PNG to WebP for free?

Open the Image Converter, add your PNG, choose WebP as the output, and download the result. It is free and runs in your browser with nothing uploaded.

Does WebP keep PNG transparency?

Yes. WebP supports an alpha channel, so transparent areas in your PNG stay transparent after conversion - unlike JPG, which fills them with a solid colour.

How much smaller is WebP than PNG?

WebP is typically 25 to 35 percent smaller than a comparable PNG, and often much smaller for photographic images, while keeping similar visual quality.

Is it safe to convert private PNGs?

With Dev Nexus, yes. The conversion happens entirely in your browser and the file is never uploaded, so unreleased or internal images stay on your device.

Do all browsers support WebP?

All modern browsers support WebP. A few older apps and email clients do not, so keep a PNG or JPG fallback if your audience includes legacy software.