Text extraction parses PDF character streams, maps embedded font glyph IDs to universal UTF-8 Unicode characters, and outputs clean unformatted plain text with sequential page markers. Clean text files are the universal input standard for Large Language Models (ChatGPT, Claude, Gemini), NLP data pipelines, search indexers, and text-to-speech engines. Essential for developer tooling, AI document analysis, academic data mining, and database ingestion.