I'm looking for a fullscreen browser app for iPad with no navbar, so the user can only navigate on the same page but not go anywhere else. Does anybody know an app for this? Or is it possible to do this in standard Safari?
I do not know how to disable the navigation bar on Safari for iOS. However, applications exist for iOS that may satisfy your requirement. You may want to search the internet for terms such as "kiosk browser ipad" or a similar query.
One of these applications is called Amtel Secure Browser Kiosk. I have never personally used it, but it is free.
Amtel provides a secure restricted browser & kiosk application for iOS users. Browser policies can be configured such that only whitelisted links are made available to the end users. The application is designed to help IT departments at Healthcare organizations, Financial institutions, Education sector, Libraries, Hi-tech, Fleet management etc manage browser security on the iOS devices. The Administrator can customize the settings to stop blacklisted sites on the devices or allow only favorite sites on the browser. The kiosk mode is designed to give the users the benefits of mobile device technology with fewer distractions & security risks. The configuration of browser settings is done at Amtel Mobile Device Management console - MDM.
Since i dont know much about technical terms so i will just post you the link check they have shown how to enable full screen in safari itself
. or you can use apps like SFWB OR FREE Full Screen Private Browsing for iPhone & iPad by SAVY SODA.