# PageIndex | Vectify AI | Knowledge Base | Instagit

📑 PageIndex: Document Index for Vectorless, Reasoning-based RAG

GitHub Stars: 15.2k

Repository: https://github.com/vectifyai/pageindex

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## Articles

### [PageIndex Document Size Limits and Scaling Strategies: A Complete Guide](/vectifyai/pageindex/pageindex-document-size-limits-scaling-processing)

Discover PageIndex's document size limits and scaling strategies. Learn how PageIndex handles large documents and optimize your LLM processing.

- Tags: how-to-guide
- Published: 2026-02-16

### [How Node Text Extraction and Summarization Work in PageIndex](/vectifyai/pageindex/pageindex-node-text-extraction-summarization)

Discover how PageIndex performs node text extraction and summarization by slicing page content and generating LLM summaries. Learn about the PageIndex repository.

- Tags: internals
- Published: 2026-02-16

### [How PageIndex Handles Markdown Files Differently from PDF Documents](/vectifyai/pageindex/pageindex-handle-markdown-vs-pdf)

Discover how PageIndex processes Markdown via regex and PDFs using LLMs. Learn about header extraction, ToC detection, and index bookkeeping for navigable hierarchies.

- Tags: deep-dive
- Published: 2026-02-16

### [How PageIndex Builds a Tree Structure for Nested Sections and Subsections](/vectifyai/pageindex/pageindex-tree-structure-nested-sections-handling)

Discover how PageIndex builds a tree structure for nested sections and subsections by parsing dotted codes and recursively nesting nodes. Learn the process in pageindexutils.py.

- Tags: internals
- Published: 2026-02-16

### [How Mafin 2.5 Uses PageIndex for Hierarchical Financial RAG](/vectifyai/pageindex/pageindex-mafin-2-5-relationship)

Discover how Mafin 2.5 utilizes PageIndex for advanced financial RAG. Learn how its hierarchical tree approach boosts accuracy surpassing traditional methods.

- Tags: how-to-guide
- Published: 2026-02-16

### [How to Integrate PageIndex into Existing RAG Pipelines: A Complete Technical Guide](/vectifyai/pageindex/pageindex-integrate-existing-rag-pipelines)

Integrate PageIndex into RAG pipelines by replacing chunking with hierarchical retrieval. Use page_index to build document trees and retrieve precise contextual sections for enhanced RAG performance.

- Tags: how-to-guide
- Published: 2026-02-16

### [What Happens When `verify_toc` Fails with Low Accuracy in PageIndex](/vectifyai/pageindex/pageindex-verify-toc-low-accuracy-failure)

Discover what happens when PageIndex verify_toc fails with low accuracy. Learn how PageIndex attempts simpler extraction strategies before raising an exception.

- Tags: troubleshooting
- Published: 2026-02-16

### [Common Failure Modes in PageIndex and How to Debug Them](/vectifyai/pageindex/pageindex-common-failure-modes-debugging)

Learn about common PageIndex failure modes like LLM truncation and misaligned indices. Debug effectively by inspecting raw LLM outputs and logs in VectifyAI/PageIndex.

- Tags: debugging-guide
- Published: 2026-02-16

### [How to Add Custom Node Summaries or Document Descriptions to PageIndex](/vectifyai/pageindex/pageindex-add-custom-node-summaries-descriptions)

Learn how to add custom node summaries or document descriptions to PageIndex. Easily configure LLM generation or inject your own text for detailed content insights.

- Tags: how-to-guide
- Published: 2026-02-16

### [Performance Implications of Choosing Different Models in PageIndex: A Technical Analysis](/vectifyai/pageindex/pageindex-performance-implications-model-choices)

Explore PageIndex model performance: Analyze tokenization accuracy, API latency, costs & TOC extraction. Understand how LLM choices impact your VectifyAI/PageIndex project.

- Tags: performance
- Published: 2026-02-16

### [Understanding physical_index Tags in PageIndex: Core Mechanisms for PDF Page Anchoring](/vectifyai/pageindex/pageindex-role-physical-index-tags)

Discover how physical_index tags in VectifyAI/PageIndex create stable anchors for LLM table of contents and page verification. Learn core mechanisms for PDF page anchoring.

- Tags: internals
- Published: 2026-02-16

### [How PageIndex Achieves State-of-the-Art Accuracy on FinanceBench](/vectifyai/pageindex/pageindex-financebench-accuracy-achieved)

Discover how PageIndex achieves 98.7% accuracy on FinanceBench by replacing vector retrieval with a hierarchical tree index and reasoning navigation for improved financial insights.

- Tags: deep-dive
- Published: 2026-02-16

### [Text-Based vs Vision-Based RAG Implementations in PageIndex: Architecture and Code Guide](/vectifyai/pageindex/pageindex-text-vs-vision-rag-implementations)

Explore text-based vs vision-based RAG in VectifyAI PageIndex. Learn about architectural differences, code implementation, and discover how to leverage both standard LLMs and multimodal VLMs efficiently.

- Tags: architecture
- Published: 2026-02-16

### [How PageIndex Handles Three Table of Contents Processing Modes](/vectifyai/pageindex/pageindex-handle-toc-processing-modes)

Discover how PageIndex intelligently selects one of three table of contents processing modes based on your PDF's structure and page number inclusion. Optimize your document analysis now.

- Tags: how-to-guide
- Published: 2026-02-16

### [Page Offset Calculation in PageIndex: Mapping TOC Page Numbers to Physical Indices](/vectifyai/pageindex/pageindex-page-offset-calculation-toc-page-numbers)

Learn how PageIndex calculates page offset for TOC entries by finding the common difference between TOC page numbers and physical indices, ensuring accurate alignment.

- Tags: how-to-guide
- Published: 2026-02-16

### [How Asynchronous Processing in PageIndex Enables Concurrent Title Verification](/vectifyai/pageindex/pageindex-async-processing-concurrent-verification)

Learn how PageIndex uses Python asyncio for asynchronous processing to achieve concurrent title verification, speeding up OpenAI API calls and reducing processing time.

- Tags: internals
- Published: 2026-02-16

### [What Happens When a Document Processed by PageIndex Has No Table of Contents?](/vectifyai/pageindex/pageindex-handle-documents-no-toc)

Discover how PageIndex handles documents lacking a table of contents. Learn about its automatic fallback to LLM-based hierarchical extraction for synthetic TOC generation.

- Tags: deep-dive
- Published: 2026-02-16

### [How PageIndex Handles Very Large Documents That Exceed LLM Context Limits](/vectifyai/pageindex/pageindex-handle-large-documents-context-limits)

Discover how PageIndex tackles large documents beyond LLM context limits by expertly chunking, splitting, and verifying content for seamless processing. Learn more now.

- Tags: how-to-guide
- Published: 2026-02-16

### [PageIndex Retry Mechanism for Fixing Incorrect TOC Entries: Implementation Guide](/vectifyai/pageindex/pageindex-retry-mechanism-fix-toc-entries)

Learn how PageIndex fixes incorrect TOC entries with a bounded exponential retry loop. Discover the implementation in VectifyAI/PageIndex for up to 3 correction attempts.

- Tags: how-to-guide
- Published: 2026-02-16

### [How the Verification Process in PageIndex Ensures Accurate Page Indices](/vectifyai/pageindex/pageindex-verification-process-accuracy)

Discover how the PageIndex verification process uses LLM fuzzy matching to ensure accurate page indices. Learn about its iterative correction for high-confidence results.

- Tags: architecture
- Published: 2026-02-16

### [Understanding max_page_num_each_node and max_token_num_each_node in PageIndex](/vectifyai/pageindex/pageindex-configuration-parameters-explained)

Learn how PageIndex configures max_page_num_each_node and max_token_num_each_node to prevent LLM token limit errors and maintain document hierarchy. Optimize your content management.

- Tags: deep-dive
- Published: 2026-02-16

### [How PageIndex Detects and Processes Tables of Contents from Documents](/vectifyai/pageindex/pageindex-detect-process-toc-documents)

Learn how PageIndex automatically detects and processes document tables of contents, converting them into hierarchical JSON with precise page indices using an LLM pipeline.

- Tags: how-to-guide
- Published: 2026-02-16

### [PageIndex Internal Tree Structure Format: Schema, Generation, and Implementation](/vectifyai/pageindex/pageindex-internal-tree-structure-format-generation)

Explore PageIndex's internal tree structure format, learn how it generates nested JSON-like documents using PDF TOC parsers or Markdown analyzers, and implement its node metadata for efficient document representation.

- Tags: internals
- Published: 2026-02-16

### [How PageIndex's Reasoning-Based Retrieval Compares to Vector Similarity Search](/vectifyai/pageindex/pageindex-reasoning-retrieval-vs-vector-similarity)

Discover how PageIndex reasoning-based retrieval outperforms vector similarity search. Achieve 98.7% accuracy on FinanceBench without embeddings or vector databases. Learn more about this LLM-powered innovation.

- Tags: comparison
- Published: 2026-02-16

### [How the PageIndex Verification and Correction Pipeline Ensures Accurate PDF Table of Contents](/vectifyai/pageindex/pageindex-verification-correction-pipeline)

Discover how the PageIndex verification and correction pipeline ensures accurate PDF tables of contents. Learn about its LLM-powered validation and iterative repair strategies.

- Tags: internals
- Published: 2026-02-15