How do I convert PNG to WEBP?

Upload your PNG images into the drop zone, adjust the quality slider if needed, then click "Convert all to WEBP". Download results individually or as a ZIP.

Are my images stored on the server?

Converted files are held temporarily on the server for download, then automatically deleted. No images are retained beyond your session.

How much does converting PNG to WebP improve Lighthouse image scores?

Lighthouse estimates savings per image when it flags the "Serve images in next-gen formats" opportunity. On a product page where six 200 KB PNG thumbnails are replaced with 80 KB WebP equivalents, the total image payload drops by roughly 60% -- around 720 KB. Depending on connection speed and the page's other resources, that translates to an LCP improvement of 0.3 to 0.8 seconds on simulated 4G. Pages where a PNG is the LCP element see the largest single-resource gain.

What quality setting produces the best size reduction for web delivery without visible degradation?

Quality 80 to 82 for photographic content: product photos, hero images, editorial photos. At this range the file size reduction versus PNG is typically 35 to 45 percent and no visual difference is detectable at normal viewing sizes. For UI screenshots, diagrams, and images with large flat-color regions, use quality 85 to 88 -- those image types have sharper edges where lower quality settings introduce visible ringing artifacts. For icons and logos, use lossless WebP or quality 90 and above; the size gain is smaller but edge clarity is preserved at all display densities.

How do I serve WebP to modern browsers while keeping a fallback for older ones?

Use the HTML picture element: . Browsers with WebP support (Chrome, Firefox, Edge, Safari 14+) fetch the WebP source. Browsers without it fall back to the img src PNG automatically, with no JavaScript or server logic required. Image CDNs like Cloudflare Images, Fastly Image Optimizer, and Imgix can negotiate the format automatically based on the browser Accept header, so you maintain one canonical image and the CDN delivers WebP or PNG per request.

My PNG logo has a transparent background. Does WebP handle it for web serving?

Yes. WebP supports alpha-channel transparency in both lossy and lossless encoding modes. Transparent PNG logos convert to WebP with the transparency layer intact. Before deploying to production, test the WebP against both a light and a dark background in your browser. At lower quality settings, anti-aliased edges can show faint compression artifacts that are not visible against white but become apparent on dark or saturated backgrounds.

Why is my WebP output occasionally larger than the PNG source?

This occurs with very simple graphics where PNG's DEFLATE compression is already highly efficient: flat-color icons, images with two or three distinct colors, and gradients with large uniform areas. For those cases, switch to lossless WebP encoding -- lossless WebP is typically 25 to 30 percent smaller than equivalent PNG even when lossy WebP provides no advantage. If lossless WebP also comes out larger on a specific image, PNG is the better format to serve for that asset.

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PNG to WEBP Converter

Q: Is the PNG to WEBP converter free?

Yes, completely free. No account, no subscription, and no watermarks are added to converted files.

PNG WEBP

Convert up to 5 PNG images to WEBP — drag, drop, download.

Last updated July 6, 2026

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About PNG → WEBP conversion

What is PNG?

PNG is a lossless image format that supports full transparency (alpha channel). Every pixel is preserved exactly, making it the preferred choice for logos, UI graphics, screenshots, and any image with sharp edges or flat areas of colour.

What is WEBP?

WEBP is a modern image format developed by Google. It delivers significantly smaller file sizes than JPG and PNG — both in lossy and lossless modes — while maintaining comparable visual quality, making it the standard for performance-focused websites.

About PNG

PNG's lossless storage model makes it the right source format for image assets that require precision: logos, icons, UI screenshots, diagrams with sharp text, and graphics where every pixel matters for editing. That same precision model makes PNG less suited for final web delivery than for authoring. Every pixel stored losslessly means larger files, and larger files mean slower page loads on mobile connections and higher CDN transfer costs on high-traffic properties.

When PNG is the right starting point for a WebP conversion

Converting PNG to WebP is a web-optimization step, not an editing step. You author and store images as PNG for quality assurance; you deliver them as WebP to web visitors for performance. UI components exported from Figma as PNG, product screenshots, and hero images that began as high-resolution PNGs are all candidates for WebP conversion before deployment to a web property. The PNG source stays unchanged; the WebP is the delivery artifact.

PNG transparency survives WebP encoding without loss. Transparent logos and interface elements convert to WebP with the full alpha channel preserved, eliminating the white-background artifact that JPEG conversion produces.

About WEBP

WebP was built specifically for web image delivery. It combines lossy and lossless encoding modes, supports alpha-channel transparency, and achieves file sizes that are 25 to 40 percent smaller than equivalent PNG at the same visual quality for photographic content, and 40 to 70 percent smaller for flat-color graphics, logos, and UI elements. For images where both file size and quality matter at web scale, WebP is the current standard.

WebP compression modes and when to use each

Lossy WebP (the default for photographic images) uses prediction coding derived from the VP8 video codec. It eliminates detail that human vision is least sensitive to, producing smaller files than JPEG at the same perceived quality. Lossless WebP uses spatial prediction and entropy coding to reduce file size without discarding any data, and produces files about 26 percent smaller than PNG on average. For logos and icons where pixel accuracy is required, lossless WebP preserves the source exactly while still reducing bandwidth cost.

WebP browser support covers Chrome, Firefox, Edge, and Safari 14 and later. For the small percentage of visitors on older browsers, the HTML picture element provides a PNG fallback without any JavaScript or server logic: the browser selects WebP if it can, PNG otherwise.

PNG to WebP is a web delivery decision measured in file size and load time. WebP's compression produces files that are 25 to 40 percent smaller than equivalent PNG for photographic content, and 40 to 70 percent smaller for images with flat-color areas, hard edges, and transparency -- the image types that PNG is most commonly used for. Smaller files mean faster downloads, which reduces Largest Contentful Paint (LCP) time and cuts CDN bandwidth costs at scale.

A Lighthouse performance audit on a page with several PNG images will flag a "Serve images in next-gen formats" opportunity showing an estimated savings figure in kilobytes and seconds. On a product category page serving 30 PNG thumbnails averaging 150 KB each, converting to WebP at quality 82 typically reduces total image weight by 1.5 to 2 MB per page load. On 500,000 daily loads, that reduction translates directly to CDN transfer cost savings and faster page rendering for users on mobile connections.

Serving WebP with a PNG fallback

WebP has above 97 percent global browser support as of 2026. The remaining 3 percent -- very old Android WebViews, Internet Explorer, and some non-standard browsers -- cannot render WebP natively. The correct pattern for production serving is the HTML picture element:

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

Modern browsers request the WebP source. Older environments fall back to the PNG img tag. Image CDNs -- Cloudflare Images, Fastly Image Optimizer, Imgix, AWS CloudFront with Lambda@Edge -- can handle format negotiation based on the browser Accept header, so you maintain one canonical image file and the CDN delivers the right format per request.

Choosing the right quality setting

Quality 80 to 82 is the correct starting point for photographic content at typical screen display sizes. For images containing text labels, sharp lines, or high-contrast edges -- diagrams, UI screenshots, annotated product photos -- use quality 85 to 90 to prevent ringing artifacts at edges. Lossless WebP is the right encoding for icons, logos, and graphics where pixel-level accuracy is required and any lossy artifact would be visible at the target display density.

WebP to PNG (reverse conversion) · PNG to AVIF (better compression ratios where browser support is confirmed)

When to convert PNG to WEBP

Resolving a Lighthouse "next-gen formats" audit finding: A developer runs a Lighthouse performance audit on a product landing page and sees a "Serve images in next-gen formats" warning covering four PNG hero images. Converting each to WebP at quality 82 drops combined image weight from 1.3 MB to under 560 KB. The Lighthouse re-run shows the opportunity cleared and the LCP decreases from 3.1 to 2.3 seconds on a simulated mid-tier mobile connection.
Cutting CDN bandwidth costs across a high-traffic product catalog: An e-commerce platform serves 40 PNG product thumbnails per category page, each averaging 130 KB. Equivalent WebP files at quality 82 average 55 KB. On 500,000 daily category page loads, the format switch reduces image bandwidth by approximately 37 GB per day -- a measurable reduction in CDN transfer costs with no change to visual quality at any supported viewport size.
Optimizing static site image output before deployment: A developer building a documentation site with Hugo or Eleventy converts all PNG source images to WebP before the build step. The build output references WebP files directly, reducing each page's image payload by an average of 38 percent with no server-side processing at request time and no changes to the HTML templates beyond adding picture element fallbacks.
Preparing high-resolution app screenshots for marketing page delivery: A product team updates their marketing site with new app screenshots exported as PNG at 2x resolution. Each screenshot is around 420 KB. Converting to WebP at quality 85 reduces each to approximately 175 KB without visible degradation at retina display density, keeping the page within Core Web Vitals recommended image payload thresholds.
Replacing legacy PNG assets in a WordPress media library for bandwidth reduction: A site running WordPress without server-side format negotiation has several years of uploaded PNG images. Converting the highest-traffic images to WebP and re-uploading them reduces per-page image payload on those templates and cuts shared hosting bandwidth consumption during traffic spikes, without requiring plugin or server configuration changes.

PNG to WEBP — frequently asked questions

Does converting PNG to WebP measurably improve page load speed?

Yes, measurably. WebP files are typically 25 to 40 percent smaller than PNG at equivalent visual quality. Fewer bytes to transfer means earlier render completion for image resources. The LCP improvement is largest on pages where a PNG is the Largest Contentful Paint element -- hero images, above-the-fold product photos, and featured thumbnails. On pages where images are not the LCP element, the reduction in total page weight still improves overall load metrics.

Does a PNG with a transparent background convert to WebP correctly for web serving?

Yes. WebP supports alpha-channel transparency in both lossy and lossless encoding modes. Transparent PNG images -- logos, UI components, cutout product photos -- convert to WebP with the transparency intact and ready for browser rendering. Before deploying to production, test the output against both light and dark page backgrounds using browser developer tools to confirm anti-aliased edges render correctly at the target display size.

Do I need to change my server or CDN configuration to serve WebP?

Not for the picture element approach -- the browser requests whichever format matches the source type declared in the markup, no server logic required. For CDN-level format negotiation, where the CDN automatically selects WebP or PNG based on the browser Accept header, configuration varies by provider: Cloudflare Images, Fastly Image Optimizer, and Imgix support automatic format selection as a feature toggle or rule; AWS CloudFront requires Lambda@Edge or CloudFront Functions for format routing.

What quality setting is right for a hero image on a high-traffic marketing page?

Quality 80 to 82 is the right starting point for photographic hero images on standard displays. At this range the size reduction versus PNG is typically 35 to 45 percent with no perceptible visual difference at normal screen viewing distance. For hero images displayed on retina or high-DPI displays, test at quality 85 before deploying -- high-density pixel displays at 2x scale can reveal compression artifacts at lower quality settings that are invisible at 1x. Test on an actual device before committing to a quality setting for production.

Is the PNG to WebP converter free?

Yes. No account required, no watermarks on output, no per-file usage cap beyond the 20 MB file size limit.

Also see: WEBP to PNG, JPG to WEBP, Compress Image.

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