Convert PNG to WebP — Free, Browser-Based, Lossless or Lossy

How to convert PNG to WebP

Drop your PNG (or JPG) files into the box above. You can mix PNG and JPG inputs in a single batch.
Adjust the quality slider. Our default of 80 is a solid balance for the web. Raise it for visually critical images, drop it for thumbnails.
Download the WebP files. Each input is converted individually with the quality you chose.

The conversion happens entirely in your browser via the native WebP encoder. No upload, no signup, no file-size cap.

What is WebP?

WebP is a modern image format developed by Google and released in 2010. It supports both lossy and lossless compression, transparency, and animation, all in a single format. Safari was the last major holdout and added support in version 14 (September 2020), which is the moment we started recommending it as a safe default.

The selling point is file size:

WebP lossless files typically run 26% smaller than equivalent PNGs.
WebP lossy files typically run 25–35% smaller than equivalent JPEGs at the same visual quality.

On a typical content site, switching to WebP shaves hundreds of kilobytes off every page load with no perceptible quality loss. That translates directly into faster Core Web Vitals scores, lower bandwidth bills, and a better experience for users on slow connections.

Why convert PNG to WebP?

PNG is a fine format, but it was designed in the 1990s for use cases that no longer dominate the web. Modern sites serve photographs and complex graphics where PNG’s lossless preservation is overkill. Converting to WebP gets you:

Smaller files without visible quality loss.
Transparency support equivalent to PNG (so you can swap transparent PNGs one-for-one).
Universal modern browser support. WebP works in Chrome (since 32), Firefox (since 65), Edge, Safari 14+, and Opera. In 2026 that’s roughly 99% of real-world traffic.
Better Core Web Vitals. Smaller images mean faster Largest Contentful Paint, the metric Google watches most closely.

The only reason to keep PNG today is if you’re specifically targeting users on Internet Explorer or Safari 13 and earlier, which together are a rounding error.

Lossy vs lossless WebP

WebP has two compression modes:

Lossy WebP uses a VP8-based encoder to discard information your eye won’t notice. The result is much smaller files at a slight quality cost. This is what we use for photographs and complex images.
Lossless WebP uses a different encoder that preserves every pixel exactly. The result is larger than lossy WebP, but still typically 26% smaller than the equivalent PNG.

Our tool uses the browser’s native WebP encoder. The quality slider controls the lossy encoder’s quality parameter directly. For lossless behavior, set the slider to its maximum and accept that files will be a bit larger.

When to use WebP (and when not to)

Reach for WebP when:

You’re serving images on a website to modern browsers.
File size matters for performance, SEO, or bandwidth costs.
You need transparency without the bulk of a full PNG.
You want a single format that handles photos, graphics, and animations.

Don’t use WebP when:

You’re sending images via email. Many older email clients still don’t render WebP. Use JPEG or PNG instead.
Your audience runs on ancient browsers (IE, Safari 13 and below). For most 2026 audiences this isn’t a concern, but double-check your analytics.
You need an editing-grade master. Use PNG, TIFF, or your editor’s native format, and only export WebP at publish time.

How our converter protects your privacy

Like all our tools, the PNG-to-WebP converter runs entirely inside your browser. The browser already ships with a fast, native WebP encoder. We just call it from JavaScript via the standard <canvas> API.

That means:

Your files never leave your computer. No upload to a third-party server.
There are no file-size or batch limits beyond what your browser’s memory can hold.
There’s no account, no login, no rate limiting. Use the tool as often as you like.
It keeps working offline. Once the page loads, you don’t need an internet connection to convert files.

You can verify all of this by opening DevTools, switching to the Network tab, and watching while you process a file. There will be no outbound requests.

Tips for converting PNG to WebP

Don’t double-compress. If your PNG has already been optimized, the WebP gain comes from the format change, not from re-compressing information that’s already gone.
Pick lossy unless you have a reason not to. Lossy WebP at quality 80 is visually indistinguishable from the original at a fraction of the size. Lossless is only necessary for archival or pixel-perfect work.
Resize first. WebP is more efficient than PNG, but it can’t make a 4000-pixel-wide image small if you only need 800 pixels.
Provide a fallback in HTML. Use <picture> with both WebP and PNG/JPEG sources for the rare browser that still lacks WebP:

<picture>
  <source srcset="image.webp" type="image/webp">
  <img src="image.png" alt="...">
</picture>

PNG to WebP