Techniques for Unstructured PDF in RAG Chatbot

You can try LlamaParse: https://docs.llamaindex.ai/en/stable/llama_cloud/llama_parse/
its state of the art parser out there

ow i know this but my pdf (data privacy) is bit sensitive, and i know that it has free 1000 creds per day so whats the catch? do they use my data?

No data is kept only for 48 hrs in the cloud for reason such as if you try to call the API again it would not take time like it did for the first time and return it quickly.
After 48 hrs data is removed from the cloud.

thanks for that information