Converting PNG files to WebP is one of the fastest wins available for website speed. WebP lossless images are 26% smaller than PNG on average. For most websites still serving PNG, switching to WebP cuts page weight without touching a single line of code.
This converter runs entirely in your browser, handles multiple files at once, and never sends your images to a server.
How to Convert PNG to WebP
Drop your PNG files into the grey upload area or click it to open a file picker. You can select as many files as you want in one go. The converter accepts standard PNG files including those with transparent backgrounds.
Once your files appear in the queue, adjust the quality slider if needed, then click Convert All. Each file processes in sequence. When a file finishes, a Save button appears next to it. Download files one at a time or click Download All to get everything at once.
The entire process runs inside your browser using the Canvas API. There is no upload step, no waiting for a server response, and no file size limit imposed by a server. Conversion speed depends on your device and image dimensions.
The Quality Slider
The quality slider controls the trade-off between file size and visual quality. It is the most important setting to understand before converting.
At 100%, the output is as close to lossless as WebP’s lossy encoder allows. File size savings are smaller but quality is highest.
At 85% (the default), most people cannot see any difference from the original at normal viewing size. This is the recommended setting for most web images.
Below 60%, compression artifacts become visible on detailed images, particularly around edges and text. Fine for thumbnails and background images, but not for product photography or hero images.
| Quality Setting | Typical File Size vs PNG | Best For |
|---|---|---|
| 100% | Similar or slightly smaller | Archiving, print-ready web assets |
| 85% | 20–35% smaller | General web images, photos |
| 70% | 35–50% smaller | Blog images, social previews |
| 50% | 50–65% smaller | Thumbnails, decorative backgrounds |
| 30% | 65–75% smaller | Tiny icons, low-priority images |
Actual savings depend on image content. A PNG with large flat areas of color (logos, icons, illustrations) compresses more aggressively than a PNG of a photograph with fine detail.
Preserve Transparency
The Preserve Transparency checkbox keeps alpha channel data in the converted file. WebP supports transparency in both lossless and lossy modes, which gives you significant size reductions compared to PNG while keeping backgrounds intact.
Leave it ticked if your PNGs have transparent backgrounds: logos, icons, product cutouts, UI elements. The transparency carries through to the WebP file exactly as it was in the original.
Unticking it fills transparent areas with a white background before converting. Only do this if you know the image will always appear on a white background and you want the smallest possible file size.
This is a key advantage WebP holds over JPEG. JPEG cannot store transparent backgrounds at all. Before WebP, any image needing transparency had to stay as PNG, which meant larger files. WebP gives you smaller file sizes with full transparency support.
Your Files Stay Private
Every conversion happens entirely within your browser. No image data leaves your device. The converter does not send files to any external server, does not store anything, and does not require you to create an account.
Most online converters upload your files to their servers, process them remotely, and serve the result back. With a browser-based converter, the only file transfer is from your hard drive to your browser’s memory, and from your browser’s memory back to your hard drive when you download.
Why Switch from PNG to WebP
PNG is a lossless format. Every pixel in the original is preserved exactly. That is useful for screenshots, design files, and anything where pixel-perfect accuracy matters. It is less useful for web images, where the goal is fast load times at acceptable visual quality.
WebP is a modern image format developed by Google that provides superior lossless and lossy compression for images on the web. The same image served as WebP instead of PNG loads faster, uses less bandwidth, and costs visitors less data on mobile connections.
| Format | Compression | Transparency | Typical Web File Size |
|---|---|---|---|
| PNG | Lossless | Yes | Largest |
| JPEG | Lossy | No | Medium |
| WebP (lossy) | Lossy | Yes | Smallest |
| WebP (lossless) | Lossless | Yes | Smaller than PNG |
WebP vs AVIF: Which Should You Use in 2025?
WebP is not the only modern alternative to PNG. AVIF is newer and often produces smaller files. Here is how they compare for practical use.
AVIF stores images at roughly 20–30% smaller file sizes than WebP at equivalent visual quality, and around 50% smaller than JPEG. It supports HDR, wide color gamut, and alpha transparency. On paper, it is the better format for compression.
The catch: AVIF requires fallbacks for visitors on older devices. Safari added AVIF support in iOS 16 (September 2022), which means anyone on iPhone 7 or older iOS versions cannot display AVIF. WebP, by contrast, works in Safari from iOS 14 onward and covers roughly 95–96% of browsers globally as of 2025.
For most websites, WebP is the practical default. Use AVIF if you serve a tech-forward audience and implement fallbacks with the HTML <picture> element:
<picture>
<source srcset="image.avif" type="image/avif">
<source srcset="image.webp" type="image/webp">
<img src="image.jpg" alt="Description">
</picture>This tells browsers to load AVIF if they support it, fall back to WebP, then fall back to JPEG. The converter on this page produces WebP, which works as the primary format or as the fallback layer in an AVIF-first setup.
WebP Browser Support
Over 96% of browsers support WebP as of 2025. This includes Chrome, Firefox, Edge, Opera, and Safari 14 and above on both desktop and iOS. Internet Explorer never added support and reached end of life in 2022.
A few edge cases worth knowing:
- Safari 14 to 15.6: Lossy WebP works, but lossless and animated WebP need Safari 16 or later. Users on macOS Big Sur or Monterey may see static images where you expect animation.
- Older Android: Android 2.1 to 3 had no WebP support. Android 4.0 to 4.1 supported only lossy WebP. On any modern Android device or Chrome for Android, this is not a concern.
- Image editors: Adobe Photoshop added native WebP support in version 23.2. Older versions need a plugin. Designer assets may still arrive as PNG until the editing environment is updated.
For most public websites, serving WebP without a fallback is reasonable. If you need to support an older Safari audience or have analytics showing significant traffic from iOS 13 or below, add a JPEG fallback using the <picture> element.
WebP and Google Core Web Vitals
Google’s Core Web Vitals measure page performance and influence search rankings. Two of the three metrics are directly tied to image load times.
Largest Contentful Paint (LCP) measures how long it takes for the largest visible element on a page to load. Images are responsible for LCP on 85% of desktop pages and 76% of mobile pages, according to the 2025 Web Almanac. Switching large PNG images to WebP reduces the data that needs to download before the page renders, which improves your LCP score.
Cumulative Layout Shift (CLS) measures unexpected layout movement. Images without explicit width and height attributes cause layout shifts as they load. This applies regardless of format, but smaller WebP files load faster, reducing the window in which a layout shift is possible.
Google’s PageSpeed Insights flags PNG images as a performance opportunity and recommends next-generation formats like WebP. Converting PNGs before uploading is more reliable than relying on server-side conversion, because you control the quality and output directly.
If you run a WordPress site, WebP conversion before upload removes the problem at the source. Many WordPress image optimization plugins (ShortPixel, Imagify, Squoosh) also generate and serve WebP automatically, with JPEG or PNG as the fallback for older browsers.
Batch Converting Multiple Files
The converter handles multiple PNGs in a single session. Add all your files at once by selecting them in the file picker (hold Ctrl or Cmd to select multiple), or drag a group of files into the drop zone together.
The file queue shows each image with its name, original file size, converted file size, and the percentage reduction. You can see exactly how much each conversion saved before downloading anything.
Download All sends each converted file to your downloads folder in sequence with a short delay between each to prevent the browser from blocking simultaneous downloads.
Frequently Asked Questions
Does converting PNG to WebP reduce quality?
It depends on the quality setting. At 85% to 100%, most people cannot see any visual difference at normal viewing sizes. Below 70%, compression artifacts start to appear on images with fine detail or text. For logos, icons, and flat-color images, quality loss is rarely visible even at lower settings.
Do all browsers support WebP?
Over 96% of browsers support WebP, including Chrome, Firefox, Safari 14+, and Edge. The main exceptions are Internet Explorer and Safari versions older than 2020. For most websites, these represent a negligible share of traffic.
Will transparency be preserved in the WebP file?
Yes, as long as the Preserve Transparency checkbox is ticked. WebP supports alpha channels in both lossy and lossless modes. Transparent areas in your PNG will appear correctly in the converted WebP file.
Can I convert PNG files with text or screenshots?
Yes. For screenshots and images with text, use a quality setting of 85% or above to avoid visible compression around letter edges. Text compresses differently from photographic content and shows artifacts more obviously at lower quality settings.
Are my files uploaded to a server?
No. The conversion runs entirely in your browser using the Canvas API. Your files are read from your device into browser memory, processed locally, and written back when you download. Nothing is transmitted over the internet.
How much smaller will my WebP files be?
Photographic PNGs typically shrink by 25 to 40% at 85% quality. PNGs with flat color areas like logos and illustrations often shrink by 40 to 60%. PNGs that are already highly compressed may show smaller gains.
Can I convert multiple files at once?
Yes. Add as many PNG files as you need in a single session. The converter processes them in sequence and shows the savings for each file. Use Download All when finished to get every converted file at once.
Should I use WebP or AVIF in 2025?
WebP is the safer default for most sites. It has 95–96% browser support and works in Safari from iOS 14 onward. AVIF compresses 20–30% better than WebP but requires fallbacks for visitors on iOS 15 and below. If you want both, use the <picture> element to serve AVIF first with WebP as the fallback.
What is the difference between PNG and WebP?
PNG uses lossless compression, meaning every pixel is preserved exactly. It produces larger files. WebP uses either lossless or lossy compression. At similar visual quality, WebP files are significantly smaller than PNG. Both formats support transparency. WebP’s lossy mode adds smaller file sizes on top of that, which PNG cannot match.
