Get all the text out of a PDF to copy, edit or translate it.
A "digital" PDF, made by a word processor or a website, holds its text as characters: the tool reads them page by page and puts them together. You can then copy everything or download it as a .txt file.
A scanned document is just a series of images: there is no text to extract. The tool tells you so and points you to text recognition (OCR), which reads the letters in the image.
No. Extraction happens in your browser: the file stays on your device.
The PDF is probably scanned: it only contains images. Use the text recognition (OCR) tool to read the letters.
No, the tool produces plain text. To keep the layout, you need a converter to a word-processing format.