Maintenance Log page size?

I'd like to develop an Android maintenance log so that I could simply use
voice input to create the text. It will print to a Bluetooth/WiFi printer
on adhesive sheets that can be signed and then pasted in the aircrafts
logbook(s) engine, propeller, airframe as applicable.

May I hear from several of you please what size should I make these
forms, so that the adhesive sheets may be sized correctly? What size are
the pages in your logbooks?

Thanks for your input.