Convert PNG to WEBP Online
Shrink PNG files into modern WebP without giving up transparency. WebP keeps a full alpha channel while cutting size, making it ideal for web graphics and faster pages.
How to Convert PNG to WEBP in Three Steps
Upload one PNG or a batch, set the WebP quality you want, then download your optimized files separately or bundled in a ZIP.
Step 1
Add Your PNG
Drag in a single PNG or choose several files for batch conversion.
Step 2
Set Quality
Move the quality slider to balance WebP file size against visual detail.
Step 3
Download WEBP
Save each WebP file, or export the entire batch as one ZIP.
Why Convert PNG to WebP — Smaller Files That Keep Full Transparency
PNG has carried transparency on the web since 1996, but it is lossless only, and that rigidity makes files heavy. WebP arrived from Google in 2010 with something PNG never offered: a choice. It supports both a lossy mode and a lossless mode, and crucially both of them carry a full eight-bit alpha channel. That combination is why WebP has become the default recommendation for modern web delivery. PNG, by contrast, forces you into lossless whether you need it or not, which is the main reason a transparent PNG ends up heavier than the same artwork saved as WebP.
The practical payoff is size. WebP lossless typically lands twenty-five to thirty-five percent smaller than an equivalent PNG, and WebP lossy is dramatically smaller again while still supporting transparency. For a site serving hero images, product cutouts or sprite sheets, that reduction shows up directly in Largest Contentful Paint and in the Core Web Vitals report. This converter exposes a quality slider so you can dial in exactly where you want to sit on that curve. Because WebP keeps alpha in both modes, transparency is not something you have to sacrifice to get the size win.
Mechanically, the process is straightforward and completely local. Your PNG is decoded, drawn onto a canvas, and encoded to WebP through the browser’s own encoder. Because WebP has an alpha channel, there is no background flattening step, unlike converting to JPG, so transparent edges survive untouched. You can process many files in a single run and download the whole set in one ZIP, with no watermark on anything.
Scenarios where this conversion earns its keep are easy to find. E-commerce teams convert transparent product cutouts to WebP so category pages load quickly. Marketing teams shrink banner and hero artwork before a campaign launch. Developers convert icon sets and UI sprites without losing alpha. Agencies hand clients optimized assets that look identical while weighing far less, and everyone benefits from lower bandwidth costs on mobile connections. Any page where images dominate the transfer size is a page where this conversion pays for itself immediately.
There are still situations where PNG remains the right answer. If your audience includes browsers older than Safari 14, or a workflow touches legacy publishing and print systems, WebP support may be incomplete. Email clients are also inconsistent. The safe habit is to keep the PNG as your master and generate WebP as a delivery format, which is exactly what this tool is designed for.
Alpha Preserved
WebP carries a full alpha channel, so transparent PNG edges stay perfectly intact.
Lossy Or Lossless
Dial quality down for smaller files, or keep high settings for near-lossless WebP output.
Built For Speed
Smaller image weight means faster page loads and stronger Core Web Vitals scores.
Batch Export
Convert many PNGs at once and download every WebP in a single ZIP.
Runs Locally
Encoding happens locally, so no file is uploaded or stored on a server.
No Watermark
Every exported WebP is clean, with no branding added to your image.
FAQ
Frequently Asked Questions
WebP delivers the same visual result at a smaller file size while still supporting transparency. That means faster page loads, better Core Web Vitals scores and lower bandwidth use, without the compromise you would face converting to JPG, which cannot store an alpha channel at all.
Yes. WebP carries a full eight-bit alpha channel in both its lossy and lossless modes, so transparent and semi-transparent areas of your PNG are preserved. Unlike converting to JPG, there is no background flattening step and no need to choose a fill color.
WebP lossless is typically twenty-five to thirty-five percent smaller than an equivalent PNG. WebP lossy is smaller again, often by seventy percent or more, depending on the image and the quality setting. Flat-color graphics and logos tend to see the largest reductions.
It can be, depending on how you set the quality slider. WebP supports true lossless encoding as well as lossy encoding. If you need pixel-exact output, use a high quality setting and compare the result against your source PNG before committing to it.
All current versions of Chrome, Edge, Firefox, Opera and Safari 14 or later support WebP, which covers the overwhelming majority of web traffic today. Older browsers, some email clients and certain legacy desktop applications may still fail to open these files.
Yes. Add several PNG files in one go and each is encoded to WebP in the same run. You can download the results individually or collect them all in a single ZIP archive, which is the fastest way to optimize an entire asset directory before a site launch.
Yes, and it is worth being deliberate about it. Keep PNG as your lossless master for editing and for destinations with uncertain WebP support, then generate WebP copies for delivery. This also lets you re-encode later if you decide a different quality setting suits your site better.
No. Your PNG is decoded and re-encoded entirely within your browser using the Canvas API. Nothing is transmitted anywhere, nothing is retained after the tab closes, and no account or email address is needed. Open the Network tab in developer tools and you will see no image requests.
The converter itself sets no cap on file size or pixel dimensions. Because every step runs in your browser, the real limit is your device memory: very large images take longer and may fail if the tab runs out of memory. For huge batches, convert in groups.
Stay with PNG for print, legacy software, email campaigns or any destination where WebP support is uncertain. PNG is also the safer archival master, because it is universally readable and fully lossless. Keep both copies and serve WebP to capable browsers, falling back to PNG elsewhere.