PNG to WebP

How PNG to WebP conversion works

This tool decodes your PNG with the browser's image engine, then re-encodes it as WebP via the Canvas API. WebP is a modern image format that delivers much smaller files at near-identical quality, which makes the PNG to WebP conversion especially useful for the web. Converting PNG to WebP can shrink file size by 20–60% while preserving transparency, helping pages load faster and rank better in search results. The entire PNG to WebP conversion runs locally in your browser — your images are never uploaded, so the process is completely private.

What is PNG?

PNG (Portable Network Graphics) is a raster image format introduced in 1996 as an improved, patent-free replacement for GIF. PNG uses lossless compression, which means no image data is discarded when the file is saved, making it ideal for graphics that require crisp edges, sharp text and precise detail. The PNG format supports full alpha-channel transparency, so it is widely used for logos, icons, UI elements, screenshots and any image that needs a transparent background. The main drawback of PNG is file size: because it always uses lossless compression, PNG files tend to be significantly larger than other web image formats such as JPG or WebP, which is why converting PNG to WebP is so valuable for web performance.

What is WebP?

WebP is a modern image format introduced by Google in 2010, designed specifically to make the web faster by producing smaller image files. WebP supports both lossy and lossless compression within a single format, so you can choose between maximum quality and minimum size when you convert an image. WebP also supports alpha-channel transparency and animation, meaning it can replace PNG, JPG and GIF all at once. According to Google, lossless WebP images are on average about 26% smaller than equivalent PNG files, while lossy WebP can be 25–35% smaller than a comparable JPG at the same visual quality — a strong reason to convert PNG to WebP for any web project.

PNG vs WebP comparison

Both PNG and WebP are capable image formats, but they differ notably in compression efficiency, features and file size. The table below summarizes the key differences between PNG and WebP so you can decide which image format — and which conversion direction — fits your needs.

Feature	PNG	WebP
Compression	Lossless only	Lossy and lossless
Image quality	Lossless, pixel-perfect	Adjustable, near-lossless possible
Transparency	Yes (alpha channel)	Yes (alpha channel)
Animation	No (APNG is separate)	Yes (native)
File size	Large	Significantly smaller
Browser support	Universal	All modern browsers
Best for	Archives, lossless editing	Web, mobile, SEO

When to use PNG to WebP conversion

Converting PNG to WebP is the right choice in most web-publishing scenarios where smaller file size matters. Because WebP keeps transparency and quality while being much smaller than PNG, the PNG to WebP conversion is especially valuable for the following use cases:

• Website speed optimization: Smaller images load faster, improve Core Web Vitals such as LCP, and provide a better experience for visitors.
• Bandwidth savings: Less data transfer reduces hosting costs and is friendlier to users on metered or slow connections.
• CDN delivery: Lighter PNG-to-WebP files cache and distribute more efficiently through content delivery networks.
• Mobile optimization: Faster image loading on phones and tablets over cellular networks.
• SEO performance: Search engines reward faster pages with better rankings, so converting PNG to WebP can directly support your SEO strategy.
• E-commerce and product images: Large catalogues benefit enormously from the size reduction of WebP compared to PNG.

How to convert PNG to WebP

Converting PNG to WebP with this tool takes only a few seconds and happens entirely in your browser. Follow these steps to convert your PNG image to the WebP image format:

1. Upload your PNG — drag a .png file onto the upload area, ou cliquez pour parcourir and select a PNG image from your device.
2. Adjust the quality — use the quality slider to balance WebP file size and visual quality of the converted image.
3. Convert — click the "Convert to WebP" button and the PNG is re-encoded as WebP locally, with no upload.
4. Download — review the original PNG and converted WebP size, then click "Download WebP" to save the WebP file.