Convert PNG to WebP for Faster Websites
If your site still serves PNG images, you are leaving speed on the table. Switching to WebP cuts file sizes by 25–80% with no visible quality loss. Here is what you need to know and how to do it in seconds.
Why PNG is slowing your site down
PNG is a lossless format — it stores every pixel exactly. That precision comes at a cost: PNG files are large. A 1200px-wide PNG banner might be 400KB to 1MB. Multiply that across a page with five images and you have a multi-megabyte payload before any code loads.
Google's PageSpeed Insights and Lighthouse flag oversized images as one of the most common performance problems on the web. The specific audit is “Serve images in next-gen formats” — and it almost always means WebP.
How much smaller is WebP?
Google's own benchmarks show lossless WebP files are 26% smaller than PNG on average. For lossy encoding (comparable to JPEG quality), WebP files are 25–34% smaller than JPEG — which is already smaller than PNG. In real-world tests on photographs, a 500KB PNG can often become a 60–90KB WebP at quality 85 with no visible difference.
For graphics, logos, and illustrations — the kind of thing you would typically keep as PNG — lossless WebP is the safe choice. You get a smaller file with pixel-perfect quality and transparency preserved.
What about transparency?
WebP supports full transparency (alpha channel), just like PNG. If your PNG has a transparent background, the WebP conversion preserves it. This is the key advantage WebP has over JPEG for things like logos, icons, and product photos with cutout backgrounds.
Browser support in 2025
WebP is supported by every major browser: Chrome, Firefox, Safari (since 14), Edge, Opera, and Samsung Internet. Global support is above 95%. The only remaining edge case is Internet Explorer, which has been out of support since 2022. For virtually every website built today, WebP is safe to use without fallbacks.
If you do need to support old browsers, the HTML <picture> element lets you serve WebP to modern browsers with a PNG fallback for others:
<picture> <source srcset="image.webp" type="image/webp"> <img src="image.png" alt="Description"> </picture>
How to convert PNG to WebP for free
Use the PNG to WebP Converter above. Drop your PNG file, adjust the quality slider (85% is recommended for most web images), and download the WebP. The conversion runs in your browser — your image is never uploaded anywhere.
Convert PNG to WebP now
Drop your PNG, set quality, download the smaller WebP. No upload, no sign-up.
Use PNG to WebP Converter →Frequently asked questions
Why should I convert PNG to WebP for my website?
WebP files are 25–80% smaller than PNG files at equivalent visual quality. Smaller images mean faster page load times, better Core Web Vitals scores, and lower bandwidth costs — all of which affect user experience and search rankings.
Does converting PNG to WebP affect image quality?
At quality 85–90%, a lossy WebP is visually indistinguishable from the original PNG for most images. Lossless WebP (which exactly preserves every pixel) is also 26% smaller than PNG on average. For web images, lossy WebP at 85% is the standard recommendation.
Do all browsers support WebP?
Yes. WebP has been supported by Chrome since 2010, Firefox since 2019, Edge since 2018, and Safari since version 14 (2020). Global browser support is now above 95%. If you need to support very old browsers, serve WebP with a PNG fallback using the HTML picture element.
Does WebP support transparency like PNG?
Yes. WebP supports full alpha channel transparency, just like PNG. This makes it a direct replacement for transparent PNGs — logos, icons, and graphics with transparent backgrounds all convert correctly.
How much can PNG to WebP conversion improve my PageSpeed score?
It depends on how many large images your page has. Google Lighthouse flags PNG images as 'Serve images in next-gen formats' when WebP would save more than 10KB. Switching a single hero image from PNG to WebP can reduce total page weight by hundreds of kilobytes and meaningfully improve LCP scores.
Should I convert all PNGs on my site to WebP?
For most web images — photos, banners, thumbnails, illustrations — yes. The exception is images that need maximum compatibility with non-browser tools, like email attachments or images shared to social media platforms that don't yet support WebP fully. For anything displayed in a browser, WebP is the better choice.