Photograph the pages of a physical book. The text gets read with OCR, map and figure pages stay as images, and you get an EPUB for a Kindle, Kobo or phone. Nothing is stored.
Prefer a PDF you already have? Convert a PDF. Scans are read with OCR, so expect a few typos in the text, same as any OCR.
Free, no signup, no watermark. The file is deleted after the download.