Practical guides on document preparation, knowledge base building, and getting the most out of custom GPTs and RAG pipelines.
Choosing the best file format for your custom GPT knowledge base directly affects retrieval accuracy. Compare PDF, TXT, DOCX, CSV, and JSON head to head.
Read more →A complete reference on ChatGPT custom GPT file size limits, token caps, and strategies for working within them. Updated for 2026.
Read more →Raw PDFs break RAG pipelines and custom GPTs. Learn how to clean PDF formatting issues like broken tables, headers, and multi-column layouts before ingestion.
Read more →Learn how to split and chunk PDFs for ChatGPT custom GPTs so your knowledge base actually retrieves the right answers. Strategies, code examples, and tools.
Read more →