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⚡ PageIndex Flash — fast, open-source tree indexing for long, text-based PDFs →
Introduction

What is PageIndex?

PageIndex is a vectorless, reasoning-based RAG engine that mirrors how humans read, delivering traceable, explainable, and context-aware retrieval, with no vector DBs or chunking. It works in two steps:

  • Index — generate a tree-structure index for each document.
  • Retrieve — agentically search that tree with LLM reasoning.
A document is turned into a tree index; an LLM then reasons over that index, guided by the query, to produce an answer.Tree IndexLLM ReasoningQueryAnswer

To learn more about PageIndex, please see our detailed introduction to the PageIndex framework.

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