I really like FairScan

It does the thing it sets out to do.

https://fairscan.org/ https://github.com/pynicolas/FairScan

OSS Document Scanner works fine for me, can be installed from the F-Droid store.

MakeACopy is pretty good

I have fairscan and OSS docs scanner installed. Fairscan has few parameters, You can choose where to save your PDF in the parameters.

OSS has a lot of parameters.

I find both Ok for my use. They are on f-droid, no account needed.

There's a lot of good scanner software, but I'll mention that Google drive (which is probably already installed on your phone) has a quality document scanner built in. Just click the camera next to the "+" button. You can also make a drive scanner shortcut to go directly on your home screen.

Over on iOS, we can just do that in Notes (the Apple one). Check to see if your notes app has a similar feature.

I think Google has an app for it as well.

Paperless is the shit. Look it up. Document mess solved, self hosted, the mobile app comes with a scanner and cropping functionality

I mean, Google Drive can do it. The files go into your Drive storage.

I imagine that's not your first choice. But it does work.

Other posters have better open source options, I'm sure.

Mobile Doc Scanner.

I downloaded an old version of lens from before the more annoying one drive integrations. I also made it stop auto updating.

To give you the whole picture I tried using several apps and none of them really did it. One of the big issues is I don't want a fucking PDF I just wanted a photograph of the document.

TurboScan does this job well.

I've used PDFgear Scan for my last handful of documents that needed scanning, and it's been great. I particularly like their UI for fine-tuning any cropping. The automatic crop is generally fine, but I'm a stickler for clean edges.