Google Document AI extracts text, forms and tables using processors tuned for specific document types, and scales on Google's infrastructure. Using it means a GCP project, processors, IAM, and hosting fees for custom processors.
pdftojson is a hosted extraction API you call directly: one authenticated request returns structured data, no cloud account to set up, on flat monthly pricing with a free browser tool for quick jobs.
Where pdftojson is different
Document AI's power comes with the GCP learning curve: projects, processors, IAM, and always-on hosting fees for custom models. pdftojson is one authenticated POST that returns JSON, Markdown, CSV, XML or text, with flat pricing and a free browser tool.
And for bank statements it reconciles the transactions against the opening and closing balances and flags anything that doesn't tie out, so a wrong number doesn't slip through.