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Runs in your browser · nothing is uploaded

Convert PNG to WebP

PNG in, WebP out, in a second or two — processed on your device, nothing uploaded.

Processed on your device · nothing uploaded

Output format

Quality92%

What this tool does

It decodes your PNG file and re-encodes the pixels as WebP at the quality you choose (92% by default — visually identical for photos). The file is read, converted and offered back as a download without touching the network.

About PNG

PNG is the lossless raster format of the web: every pixel is stored exactly, with an optional alpha channel for transparency. It was designed in 1996 as a patent-free replacement for GIF and is supported by literally everything that shows images. It is good for screenshots, logos, icons, UI graphics, anything with sharp edges, flat colour or text, and anything that needs a transparent background; less good for photographs — a photo saved as PNG is typically 5–10× larger than the same photo as a good-quality JPEG with no visible benefit. Universal: every browser, OS, editor, office suite and messaging app since the late 1990s.

About WebP

WebP is Google's web image format: it does lossy compression like JPEG and lossless like PNG, supports transparency in both modes, and files come out 25–35% smaller than the equivalent JPEG or PNG. Most websites now serve WebP, which is why you increasingly download images in it. It is good for anything on a web page — it is the practical default for the web today; less good for sending to people or programs that may not open it: older versions of Photoshop, many print shops and some office and e-mail tools still expect JPEG or PNG. All current browsers (Safari since 14 in 2020) and operating systems; patchy in older desktop software and some photo-printing services.

What changes going from PNG to WebP

  • Transparency is kept. Both formats support an alpha channel.
  • Quality: WebP is lossy. At the default 92% nothing is visible; lower the slider for smaller files.
  • Size: Small for flat graphics, very large for photos (a 12-megapixel photo is 20–30 MB as PNG) vs. about a quarter to a third smaller than JPEG at the same visual quality; lossless WebP is typically 25% smaller than PNG.
  • Metadata: EXIF (camera, date, GPS) is not carried over — the browser decodes pixels, not tags. That is a privacy plus for sharing and a minus if you rely on dates in the file.

The web performance move

This is the conversion web developers do in bulk: PNG icons, screenshots and illustrations become 25–80% smaller as WebP with transparency preserved. The tool uses lossy WebP at the chosen quality; at 90% a UI screenshot is indistinguishable from the PNG and typically a third of the size. If you need bit-perfect output, keep the PNG or use the compressor with PNG selected.

How to convert PNG to WebP

  1. Drop the PNG file on the panel above or click to choose it.
  2. WebP is pre-selected; adjust the quality slider if you need a smaller file. Press Convert to WebP.
  3. Download. The file is named after the original with a .webp extension.

Frequently asked questions

Is my PNG file uploaded?

No. The page is static and has no upload endpoint; your browser does the work on your own device and the result is saved straight back to your disk. The site's Content-Security-Policy only allows it to talk to its own origin, so it cannot send your file anywhere even by accident. Load the page, disconnect from the internet, and it still works.

Does PNG to WebP lose quality?

WebP is a lossy format, so strictly yes — but at the default 92% quality the difference from the PNG is invisible at normal viewing size. Lower the slider only if you need a smaller file.

Will transparency survive?

Yes — WebP supports an alpha channel, so transparent areas of the PNG stay transparent in the output.

Is it free? Any limits or watermark?

Free, no account, no watermark, no daily quota. Because nothing runs on our servers there is nothing to meter. The only limits are your device's memory — anything up to roughly 50 megapixels is fine on a modern phone or laptop.

Can I do several files at once?

One file at a time at the moment — drop the next one as soon as you have downloaded the first. Batch processing with a ZIP in and out is planned.

Does it work on my phone?

Yes — iPhone, iPad and Android browsers all run it. Large files take a few seconds longer on a phone than on a laptop.