Drop a camera RAW file and the largest JPEG inside it — the picture the camera itself made — is found and copied out byte for byte, with its size shown next to the sensor size.
The camera's own JPEG, copied out
A RAW file is mostly sensor data, but cameras also write ordinary JPEGs into it: a tiny thumbnail, often a screen-sized picture, and on most models a full-size one that the camera's screen and your computer's file browser show. This page walks through the file, finds every complete JPEG inside it, and takes the largest.
Because that picture is already a JPEG, the lossless setting saves it without decoding a single pixel. The row says Embedded preview 6000 × 4000 · full sensor 6024 × 4020 (or whatever your camera wrote), so you can see how close to full size it is.
Step by step
- Drop a RAW file (or several). Each is opened in this tab.
- Check the preview and its size beside the sensor size.
- Press Add the preview to the queue.
- Press Download: the camera's JPEG, unchanged, as a .jpg.
What it does not do
It does not develop the RAW: no demosaicing, no white-balance change, no highlight recovery. If your camera embeds only a small preview (some older and compact models do), the JPG is that small preview, and the page tells you before you add it.