# Process large documents with OCR and SubworkflowAI: n8n workflow

> Started by an event in a connected app, and works across Google Drive. It hands the judgement calls to Gemini.

Source: https://millionrounds.com/workflow/process-large-documents-with-ocr-and-subworkflowai (Millionrounds; every figure on the page links to its filing or article)

[Automation library](https://millionrounds.com/workflows) · [Documents and files](https://millionrounds.com/workflows?category=Documents+and+files#library)

# Process large documents with OCR and SubworkflowAI

Started by an event in a connected app, and works across Google Drive. It hands the judgement calls to Gemini. 10 steps, 1 branch, 1 loop or waits: a working afternoon to understand properly.

Medium Calls a model: Gemini

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fprocess-large-documents-with-ocr-and-subworkflowai)

**10 steps** Medium: a working afternoon

**1** Branch: places the flow splits

**1** Loop or waits

**1** Service it connects to

## The flow

Starts it 1 Model 1 Logic 3 Service 5

The steps in the order they run, from what starts it.

- 1 **When clicking ‘Execute workflow’** Manual trigger *Starts it*
- 2 **Download file** Google Drive *Service*
- 3 **Extract API** Http Request *Service*
- 4 **Job Complete?** If *Logic*
- 5 **Get Dataset** Http Request *Service*
- 6 **Check Job Status** Http Request *Service*
- 7 **Get Dataset Items** Http Request *Service*
- 8 **Wait** Wait *Logic*
- 9 **Split Out** Split Out *Logic*
- 10 **Document OCR via VLM** Google Gemini *Model*

## How it's built

- **Starts on:** An event in a connected app
- **Steps:** 10, with 1 branch, 1 loop or waits
- **Size:** Medium: a working afternoon
- **Connects to:** Google Drive
- **Model:** Gemini

## Questions

What does it need to run?

An n8n account, plus your own Google Drive account, and a key for Gemini. You connect your own accounts after importing it; none are included.

What starts it?

It starts on an event in a connected app.

Does it use AI?

Yes. It calls Gemini. Model calls are billed by the provider, not by n8n.

How long does it take to set up?

Plan an afternoon. 10 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

**Before you run it**

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 10 steps before you point it at anything that matters.

## Run it in n8n

- **Create your n8n account** Free to start. n8n is where the workflow runs. [Create an n8n account ↗](https://millionrounds.com/n8n)
- **Download the workflow** Free with a Millionrounds account. [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fprocess-large-documents-with-ocr-and-subworkflowai)
- **Paste it into n8n** Open a new workflow in n8n and paste. Then connect your own accounts.

Stored with the author's traces removed: canvas notes, instance identifiers, saved credential names and any live document they had left behind.

## Connects to

Each opens the other workflows that use it.

[Google Drive](https://millionrounds.com/workflows?service=Google+Drive#library)

## Workflows like it

Also documents and files, with the same services where possible, closest in size first.

- [**AI-powered document processing & organization with Gemini** 10 steps · calls a model · Google Drive, Google Sheets](https://millionrounds.com/workflow/ai-powered-document-processing-and-organization-with-gemini)
- [**Automate Chinese to English translation in Google Slides** 10 steps · calls a model · Google Drive, Google Slides](https://millionrounds.com/workflow/automate-chinese-to-english-translation-in-google-slides)
- [**Build a RAG document chatbot with Supabase and OpenRouter** 10 steps · calls a model · Google Drive, Supabase vectors](https://millionrounds.com/workflow/build-a-rag-document-chatbot-with-supabase-and-openrouter)
- [**PDF to SQL Server with OpenAI and Google Drive** 10 steps · calls a model · Google Drive, Supabase vectors](https://millionrounds.com/workflow/pdf-to-sql-server-with-openai-and-google-drive)
- [**RAG-powered document chat with Google Drive and OpenAI** 10 steps · calls a model · Google Drive](https://millionrounds.com/workflow/rag-powered-document-chat-with-google-drive-and-openai)
- [**Rename Gmail attachments with OpenAI** 10 steps · calls a model · Gmail, Google Drive](https://millionrounds.com/workflow/rename-gmail-attachments-with-openai)