What is WebP and why convert it to JPG?
WebP is an image format developed by Google and widely used on the web because it produces smaller files than JPEG at equivalent quality. Modern browsers display WebP natively, and most websites serve it automatically. According to the HTTP Archive's Web Almanac 2024, approximately 71% of mobile pages include at least one WebP image — making it by far the most widely deployed next-generation format, ahead of AVIF at 17%. The problem arises when you try to use a WebP image outside the browser: many photo editors, design tools, email clients, and older operating systems don't recognise the format.
Converting WebP to JPG gives you a file that opens anywhere — Windows Photo Viewer, macOS Preview, Photoshop, Lightroom, WhatsApp, Gmail attachments. JPG is the lowest common denominator of image formats, which makes it the safest choice when you don't control what software the recipient uses.
Convert WebP to JPG without uploading
LocalJPG converts WebP files entirely in your browser. When you drop a file, a WebAssembly build of the @jsquash/webp decoder runs locally on your device to read the image data, then MozJPEG re-encodes it as JPEG. No data is transmitted — the file never leaves your machine.
This matters for screenshots of internal tools, design exports with proprietary content, or any image where you'd rather not hand a copy to a third-party server. You can confirm by watching DevTools → Network while converting: no outbound requests appear.
WebP to JPG quality and file size
WebP and JPEG are both lossy formats, so converting between them involves a decode-then-encode step that introduces some generation loss. At the default quality setting of 85, the output JPG is visually indistinguishable from the WebP for photos and most graphics. File size typically increases compared to the WebP source — that is expected, since WebP's compression efficiency is part of why Google created it.
If you need to hit a specific file size (for email attachments or upload limits), use the built-in resize tool after converting: enter a target width or a maximum byte size and LocalJPG will binary-search the optimal quality level automatically.
Batch converting multiple WebP files
Drop a folder of WebP images and the converter processes them in parallel using a background Web Worker. Individual JPGs can be downloaded one at a time for free. To download all converted files as a single ZIP, a one-time $0.50 unlocks the batch export. The ZIP is built in-browser with streaming compression — no server involved.
Also available: HEIC to JPG, PNG to JPG, AVIF to JPG
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