PNG to WebP Converter
Convert PNG images to WebP for faster websites and smaller downloads. Keep transparency, resize the image, and adjust compression quality before saving.
Upload PNG image
Choose a PNG screenshot, graphic, logo, illustration, or product image.
オリジナルPNG
オリジナルのプレビュー
WebP result
Converted preview
Private browser processing
Your files stay in your browser. ImageConver processes the file locally and does not upload it to a conversion server.
Balance quality and file size
Adjust WebP quality and pixel dimensions. Transparent PNG areas remain transparent in WebP output.
Built for web performance
WebP commonly reduces image weight compared with PNG, helping pages load faster while retaining transparency.
仕組み
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1
Upload the source
Upload the PNG image you want to optimize for a website or app.
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2
Choose settings
Choose WebP quality and resize the image to its real display dimensions.
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3
Convert and download
Preview the converted image, check its dimensions and file size, then download it.
How to optimize PNG images for the web
Resize the source to the largest size it will actually display. Exporting a 3000 pixel image for a 600 pixel content area wastes bandwidth even after conversion.
Start around 80 to 85 percent WebP quality. Logos and interface graphics may need a higher setting, while photos and illustrations often tolerate more compression.
Frequently asked questions
Does PNG to WebP keep transparency?
Yes. WebP supports alpha transparency, so transparent PNG backgrounds remain transparent.
Is WebP always smaller than PNG?
Often, but not always. Very small graphics or simple indexed PNG files can already be compact. Compare the output size and visual quality.
What WebP quality is best for websites?
Start around 80 to 85 percent, then inspect the image. Use a higher setting for sharp text, logos, and detailed interface graphics.
PNG to WebP last reviewed: Jun 9, 2026.