Convert JPG and PNG images to WebP, or convert WebP back to JPG and PNG — all in your browser. Adjust the WebP quality slider and compare before/after file size, with no upload required.
Drag and drop a JPG/PNG image here, or click below to browse.
WebP is an image format created by Google specifically for the modern web, designed to replace JPG and PNG with a single format that handles both photographic and graphic content efficiently. It supports lossy compression (similar in spirit to JPG, for photos), lossless compression (similar in spirit to PNG, for graphics and screenshots), a full alpha transparency channel, and even animation — all within one file extension. Since its introduction, WebP has gone from an experimental Chrome-only format to a broadly supported standard across every major browser, which is why it's now a common target format for web performance optimization.
The core benefit of WebP is compression efficiency: at an equivalent visual quality, WebP files are typically 25-35% smaller than JPG and often dramatically smaller than PNG for the same content. For a website, this translates directly into faster page loads, reduced bandwidth costs, and improved scores on performance metrics like Largest Contentful Paint, which search engines increasingly factor into ranking. That's exactly why WebP conversion has become a standard step in modern image optimization pipelines.
JPG uses lossy compression tuned for photographic content, discarding color and detail information human vision is least sensitive to in exchange for a smaller file, but it has no transparency support and loses a little quality on every re-save. PNG uses lossless compression, preserving every pixel exactly and supporting a full alpha channel, at the cost of larger files for photo-like content. WebP effectively combines the strengths of both: it offers a lossy mode competitive with (and usually better than) JPG for photos, a lossless mode competitive with PNG for graphics, and transparency support in both modes.
This is why converting from JPG or PNG to WebP is often a pure size win with no meaningful quality tradeoff — you're not choosing a fundamentally different compromise, you're moving to a format that made better engineering choices for the same underlying content. The main reason to stay with JPG or PNG (or to convert back from WebP) is compatibility with a specific destination system that doesn't yet accept WebP uploads, not any inherent technical advantage those older formats hold over WebP itself.
In both directions, this tool decodes the source image using the browser's built-in image decoder, draws the resulting pixel data onto an in-memory HTML canvas at the image's original dimensions, and exports that canvas to the target format using the browser's built-in encoder — all through standard browser APIs with no server round-trip or third-party service involved. Converting to WebP passes your chosen quality value straight through to the encoder; converting from WebP to JPG first fills the canvas with your chosen background color (since JPG can't represent transparency) before drawing the decoded WebP on top.
Because canvas operates on decoded pixel data rather than the original file's compressed byte stream, the output is always a faithful representation of exactly what the source image currently displays. This pixel-level, decode-and-redraw approach is the same technique that underlies most browser-based image format converters, since Canvas has broad, standardized support for reading nearly any image format the browser can display and exporting to any format the browser's encoder supports, WebP included.
Convert to WebP whenever you're preparing images for web delivery and want the smallest reasonable file size without a visible quality hit — product photos, blog hero images, thumbnails, and any other web asset where load time matters. It's a near-default choice at this point for any image destined for a modern website, given how consistently browsers now support it and how reliably it beats JPG and PNG on file size for equivalent quality.
Convert WebP back to JPG or PNG when the destination doesn't accept WebP uploads — some older content management systems, certain email clients, specific print or vendor workflows, or an image editor that doesn't open WebP files. It's also worth converting back to PNG specifically if you need a lossless file for further editing in software that doesn't support editing WebP directly, or back to JPG if a system specifically validates the file extension or MIME type and only recognizes .jpg. In short: default to WebP for anything staying on the web, and convert back only when a specific downstream requirement demands it.
WebP Converter handles conversion in both directions. These related image tools cover other common format conversions and image preparation tasks.