PNG to WebP Converter

PNG is the format the web uses for anything with crisp edges or transparent backgrounds — logos, icons, screenshots, UI mockups. 

The trade-off is size a high-resolution PNG can easily run 1-3 MB, and dozens of them on a single page is one of the fastest ways to tank your Core Web Vitals score. WebP was built specifically to solve this.

It supports the same lossless quality and full alpha channel transparency that PNG gives you, but with a compression engine that’s roughly a decade newer.

In real-world testing, converting PNG to WebP usually cuts file size by 70 to 90% with zero visible quality loss. Drop your PNG files below and you’ll see it on your own images in a few seconds.

PNG to WebP Converter

Why PNG files are so big in the first place

PNG uses a lossless compression algorithm called DEFLATE — the same one used inside ZIP files. It was state-of-the-art in 1996, when PNG was standardized. The catch is that DEFLATE has no awareness of images; it just looks for repeated byte patterns. That works fine for a flat-color logo, but the moment a PNG contains a photograph, a gradient, or anti-aliased text on a busy background, DEFLATE has very little repetition to work with — and the file balloons.

Try this experiment: take a screenshot of a webpage. If the screenshot is mostly UI (toolbars, blocks of solid color), it’ll save as maybe 80 KB. Take a screenshot of a YouTube video paused on a complex frame and the same dimensions can produce a 2 MB file. Same format, same dimensions, 25× the size — that’s the DEFLATE limitation showing through.

WebP, designed in 2010, uses predictive coding from the VP8 video codec. Instead of looking for byte repetition, it predicts each pixel from its neighbors and only stores the difference. This works dramatically better on photographic content and gradients, while still being competitive on flat graphics.

How much smaller will my PNGs actually get?

The savings depend heavily on what’s inside the PNG. Rough guide based on real conversions:

• Screenshots of UIs / mostly-flat graphics: 30–60% smaller
• Logos and icons with transparency: 40–70% smaller
• Photographic PNGs (e.g. portraits saved as PNG): 80–95% smaller
• Detailed illustrations with gradients: 60–85% smaller

If you’ve ever exported “for retina” from Figma or Sketch and ended up with a 4 MB PNG, that file is probably going to come back as 200–400 KB as a WebP. The difference is most dramatic on the files where it matters most.

Before & After

The example below shows a PNG image compared to the same image converted to WebP with the quality slider set to 85%. The original PNG file is 51KB, while the WebP version is just 3KB. Despite the file size being reduced by more than 94%, there is virtually no noticeable difference in image quality. This is one of the reasons WebP has become the standard image format for modern websites. It delivers significantly smaller file sizes while maintaining excellent visual quality, helping pages load faster and reducing bandwidth usage without affecting the user experience.

Same visual quality with a 94% smaller file size.

Lossless or lossy — which should you pick?

WebP is unusual in that it supports both modes in the same file format. The default we use here (quality 90) is lossy, which is almost always the right answer for PNGs that contain photographs, gradients, or anything visually complex. The result is visually identical to the original at a fraction of the size.

If your PNG is a UI element, logo, or anything where every pixel needs to be exact (especially text or sharp edges), set the quality slider to 100, which switches WebP into its lossless mode. You’ll still get meaningful savings — usually 20–40% — without touching a single pixel.

A practical rule of thumb: if you’re not sure, leave it at 90. Open the result and compare. If you can’t see a difference (you almost never will), keep the WebP. If it’s a logo on a busy background and you spot any softness, redo it at 100.

Will WebP keep my transparency?

Yes — and this is the single biggest reason people choose WebP over JPEG for PNG replacement. JPEG has no transparency support at all, so converting a PNG with a transparent background to JPEG forces you to flatten it onto a solid color (usually white). WebP supports the full 8-bit alpha channel, the same as PNG, including soft edges, semi-transparent shadows, and gradients that fade to transparent.

If you’ve got a logo with a soft drop shadow over a transparent background, the WebP version will look pixel-perfect identical to the PNG, just much smaller.

Where can I actually use WebP?

Browser support has been universal since late 2020, when Safari 14 finally added it. That means every modern browser — Chrome, Firefox, Safari, Edge, Opera, Samsung Internet — renders WebP natively. WordPress 5.8+ supports WebP uploads out of the box. Most CMSs (Shopify, Webflow, Squarespace) have supported it for years.

A few places where WebP doesn’t work yet:

• Some older Microsoft Office versions (2019 and earlier) won’t insert WebP into Word/PowerPoint
• A handful of email clients render WebP as a broken image (Outlook desktop is the usual culprit) — for email, stick with PNG or JPG
• Some print workflows expect TIFF or PNG; WebP isn’t a print format

For anything that’s going on the web, WebP is now the default-correct choice.

WebP is usually the best starting point for most websites.
Compare it with AVIF to see when you should switch:
AVIF vs WebP: full comparison guide

How to convert PNG to WebP with this tool

1. Drop your PNG files into the upload area above (or click to browse). You can do up to 10 at a time.
2. Quality is preset to 90, which is the sweet spot for almost every use case. Drag it to 100 if you need lossless, or down to 75 if file size matters more than perfection.
3. Click Convert. Each file processes in a couple of seconds.
4. Download files individually, or hit Download all as ZIP to grab the lot.

No signup, no email, no watermark, no daily limit beyond the 10-files-per-batch cap.

Frequently asked questions

Will I lose transparency when converting PNG to WebP?

No. WebP supports the same full alpha channel that PNG does, including soft edges and semi-transparent pixels. Your transparent backgrounds and drop shadows come through exactly as they were.

Why is my converted WebP only slightly smaller than the original PNG?

This usually means your PNG was already heavily optimized or it’s a tiny image where WebP’s overhead eats most of the savings. Both are good outcomes — your file was already efficient.

Can I convert WebP back to PNG later if I need to?

Yes, with no quality loss as long as you originally converted at quality 100 (lossless mode). Use our WebP to PNG converter when you need to.

Are my PNG files uploaded to a server?

They’re processed on our server briefly so we can deliver consistent results across browsers and operating systems, then automatically deleted within 2 hours. Nothing is stored permanently, shared, indexed by search engines, or used to train any AI.

What’s the largest PNG I can convert?

20 MB per file, with up to 10 files in a single batch. If you regularly need bigger, let us know — we can raise the limit for power users.

Should I convert all my existing PNGs to WebP?

For images that live on a website, almost certainly yes — your pages will load noticeably faster. For images you’re storing as masters (e.g. design files, source assets), keep the PNGs as your originals and serve WebP copies on the web. That way you keep a lossless master and still get the size benefits where they matter.

Does converting to WebP affect SEO?

Indirectly, in your favor. Google’s Core Web Vitals — specifically Largest Contentful Paint — reward fast-loading images. Smaller images load faster, so switching from PNG to WebP typically improves your LCP score, which is a direct ranking factor. Google itself recommends WebP in its PageSpeed Insights reports.