So do you guys have any recommendations on a good PDF annotation app (paid or free)? I know there's been some threads before but there's a few requirements I need the app to meet -Freehand highlighting -small file sizes (My iPad is only 16gb, and I don't want it to use up my memory - e.g. if I import a 70mb file and it takes up a few hundred mb with annotations)* -notetaking would be a nice bonus I've been looking at iAnnotate, Pdf Expert 5, Notability and Goodnotes. I'm currently using pdf-notes free, and I'd like to upgrade. (pdf-notes free uses up a few hundred mbs per pdf which is under 100mb). I basically want to highlight textbooks that are a few hundred pages long and some other documents. Does anyone have any experience with the apps I previously mentioned and/or any other apps? I'd be really interested in the sizes which it stores the files at (apparently notability has very large files?), as well as if there's any lag (I've head notability/goodnotes tend to lag with large pdf files?). Oh and iCloud sync and Google Drive access would be nice too. Thanks! *Clarification: I don't mean exported file sizes - I mean the file size the pdf is stored at in the app - i.e. the amount of storage the app uses up in data. E.g. my pdfs are 200-300mb total, but using pdf-notes, which pre-opens every file and stores them as a .pdfnotes format, the application has used up 1.3gb in data (and if I pre-opened them in retina format, it takes up ~4.5gb). For reference, the actual application's size is only 48.1mb. Edit: I think ? The correct term for the app using up a lot of memory is actually using up a lot of cache? I noticed another person who had the same issue with pdf notes referred to it as such.