pythonadvanced3 hr est.
Automated PDF Summarizer with LangChain
Extract text from PDFs and use LangChain to chunk and summarize long documents using a map-reduce approach.
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Last updated: 2026-06-05
Before You Begin
- 1Python
- 2LangChain concepts
Project Architecture
Folder Structure
summarizer/ ├── app.py └── sample.pdf
Data Flow
[PDF] -> [Text Extraction] -> [Text Splitter] -> [Map Summaries] -> [Reduce Summary]
Source Code Breakdown & Implementation
Install PyPDF2 and langchain.
Use PyPDFLoader to extract the document content.
Run from the command line with `python app.py sample.pdf`.
Handle files that are scanned images instead of text.
Complete Solution Code
Compare your approach
Testing Checklist
- • Test with a 2-page PDF
- • Test with a 50-page PDF
Common Bugs
Bug: Context window exceeded
Fix: Make sure your chunk size is smaller than the model's limit.