The document is opened on your device.
Bottom centre, top right, with or without the total page count.
Numbers are written into the document and stay there for anyone who opens it.
The file does not leave your device. Thirty-two tools out of thirty-eight.
Yes: you set the starting number. That helps when the document continues another one, or when the first pages should not be numbered.
Yes: you can exclude the first pages from numbering and start the numbers where they are needed.
If the document already has numbers or a crowded footer it can happen: pick a free position and glance at the result before distributing it.
It opens in your browser, nothing to install. Five operations a day are free, with no payment details.