# PDF Files

PDF (Portable Document Format) is a file format developed by Adobe for presenting documents consistently across software platforms. This module provides functionality to load and process PDF files using pdf.js.

This module provides a sophisticated PDF document loader that can:

* Load single or multiple PDF files
* Split documents by page or file
* Support base64 encoded files
* Handle file storage integration
* Process content with text splitters
* Support legacy PDF versions
* Customize metadata extraction

## Inputs

### Required Parameters

* **PDF File**: The PDF file(s) to process (.pdf extension)
* **Usage**: Choose between:
  * One document per page
  * One document per file

### Optional Parameters

* **Text Splitter**: A text splitter to process the extracted content
* **Use Legacy Build**: Whether to use legacy PDF.js build
* **Additional Metadata**: JSON object with additional metadata
* **Omit Metadata Keys**: Comma-separated list of metadata keys to omit

## Outputs

* **Document**: Array of document objects containing metadata and pageContent
* **Text**: Concatenated string from pageContent of documents

## Features

* Multiple file support
* Page-level splitting
* Legacy version support
* Text extraction
* Metadata handling
* Error handling
* Memory-efficient processing

## Processing Modes

### Per Page Mode

* Each page becomes a document
* Preserves page numbers
* Individual page metadata
* Granular content access

### Per File Mode

* Entire PDF as one document
* Combined content
* Single metadata set
* Memory efficient

## Document Structure

Each document contains:

* **pageContent**: Extracted text content
* **metadata**:
  * source: Original file path
  * pdf: PDF-specific metadata
  * page: Page number (in per-page mode)
  * Additional custom metadata

## File Handling

### Local Files

* Direct file loading
* Base64 encoded content
* Multiple file support

### Storage Integration

* File storage system support
* Organization-based storage
* Chatflow-based storage

## Notes

* Uses pdf.js for extraction
* Legacy version support
* Memory-efficient processing
* Error handling for invalid files
* Support for large PDFs
* Flexible output formats
* Metadata customization
* Text encoding handling


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