Ask HN: Tool to search, tag and manage pdfs in Google Drive

Hello, hackers!

My friend is a lawyer and he has a tons of court documents in a pdf format on his Google Drive. He need to quickly search through content of pdf files and tag them. For instance, tag all the documents which have "ACME INC" with ACME tag.

I quickly explored the problem and found that Google Drive doesn't support tagging, and there is only two tools which do tagging:

1. digitile.io (can be integrated with Google Drive and provide tagging) 2. TagSpaces.org (desktop solution)

To be honest, I can't recommend either of them. Maybe I missed some great tool, can you recommend me anything?