# PDF LLM and RAG Preparation

Turn PDFs into clean, safe, citation-ready inputs for LLM summarization, embedding, search, and RAG pipelines.

> Canonical page: https://elysiatools.com/en/hubs/pdf-llm-rag-prep

- **Keywords:** pdf rag preparation, pdf to llm text, pdf chunking citations, pdf prompt injection scan

## Frequently asked questions

### Should every PDF go straight into the RAG chunker?

No. First confirm access, OCR quality, page scope, structure, and safety. Chunking a noisy or unsafe extraction only preserves those defects inside the retrieval index.

### When is structured Markdown better than clean plain text?

Use structured Markdown when headings, lists, tables, page separators, or editorial context matter. Use clean plain text when the downstream task is broad summarization, translation, or a quick LLM prompt.

### Why scan for prompt injection in a PDF?

PDFs can contain hidden, off-page, tiny, or layered text that may not be visible to a reviewer but can appear during extraction. A differential scan helps identify content that needs manual review before model ingestion.