# PDFRack — Free Online PDF Toolkit & Document Utility Suite

> PDFRack is an online PDF manipulation and utility platform engineered for speed, privacy, and ease of use. All document processing is performed in isolated memory environments with an automated 1-hour purge cycle and 100% GDPR compliance.

## Core Conversion & Extraction Tools

- [Image Converter Suite](https://pdfrack.com/image-converter/): Convert between JPG, PNG, WEBP, GIF, BMP, TIFF, and ICO with batch conversion and quality presets.
- [JPG to WEBP Converter](https://pdfrack.com/jpg-to-webp/): Convert JPG/JPEG photos into lightweight next-gen WEBP format for maximum web performance.
- [WEBP to PNG Converter](https://pdfrack.com/webp-to-png/): Convert WEBP images to lossless PNG format with transparent background preservation.
- [PNG to JPG Converter](https://pdfrack.com/png-to-jpg/): Convert PNG pictures to standard JPEG format with customizable quality compression.
- [PNG to WEBP Converter](https://pdfrack.com/png-to-webp/): Convert transparent PNG images into next-gen WEBP format.
- [Extract Images from PDF](https://pdfrack.com/extract-images-from-pdf/): Extract embedded images from PDF documents or render pages as high-resolution PNG/JPEG graphics.
- [PDF to Image Converter](https://pdfrack.com/pdf-to-image/): Convert PDF pages to high-resolution PNG, JPG, or WEBP images with custom DPI settings.
- [Images to PDF Converter](https://pdfrack.com/images-to-pdf/): Combine multiple JPG, PNG, and WEBP image files into a single standardized PDF document.

## PDF Security & Protection

- [Protect PDF with Password](https://pdfrack.com/protect-pdf/): Secure PDF documents with 256-bit AES encryption and custom user permissions.
- [Unlock PDF & Remove Password](https://pdfrack.com/unlock-pdf/): Decrypt password-protected PDF documents and remove access restrictions.

## Document Organization & Optimization

- [Organize & Sort PDF Pages](https://pdfrack.com/organize-pdf/): Visually reorder, sort, rotate, and delete specific pages from any PDF document.
- [Split PDF Online](https://pdfrack.com/split-pdf/): Extract custom page ranges or split multi-page PDF documents into individual files.
- [Merge & Combine PDF](https://pdfrack.com/merge-pdf/): Combine multiple PDF documents into a single document with individual page range selections.
- [Compress PDF File Size](https://pdfrack.com/compress-pdf/): Optimize and reduce PDF file sizes using advanced compression presets and DPI adjustments.

## PDF & Image Engineering Knowledge Base (Guides)

- [PDFRack Knowledge Base Hub](https://pdfrack.com/guides/): 25+ comprehensive engineering tutorials, format comparisons, and technical deep dives.
- [How to Compress a PDF](https://pdfrack.com/guides/how-to-compress-a-pdf/): Complete walkthrough for shrinking PDF file sizes without quality loss.
- [How PDF Compression Works](https://pdfrack.com/guides/how-pdf-compression-works/): Technical analysis of Flate stream deflation and downsampling.
- [How to Merge PDFs](https://pdfrack.com/guides/how-to-merge-pdfs/): Step-by-step guide to combining multiple documents with custom subsets.
- [How to Split a PDF](https://pdfrack.com/guides/how-to-split-a-pdf/): Guide to page extraction and individual ZIP separation.
- [How to Extract Images from PDF](https://pdfrack.com/guides/how-to-extract-images-from-pdf/): Lossless embedded photo extraction vs 600 DPI rendering.
- [How to Protect a PDF](https://pdfrack.com/guides/how-to-protect-a-pdf/): AES-256 password encryption and permissions guide.
- [How to Remove PDF Password](https://pdfrack.com/guides/how-to-remove-pdf-password/): Removing password security and unlocking documents.
- [How to Convert PDF to JPG](https://pdfrack.com/guides/how-to-convert-pdf-to-jpg/): High-resolution page export and format selection.
- [How to Convert JPG to PDF](https://pdfrack.com/guides/how-to-convert-jpg-to-pdf/): Consolidating multiple photos into standard A4/Letter PDFs.
- [How to Organize PDF Pages](https://pdfrack.com/guides/how-to-organize-pdf-pages/): Visual page sorting, rotating, and deletion.
- [JPG vs PNG vs WEBP](https://pdfrack.com/guides/jpg-vs-png/): Definitive comparison of compression, transparency, and use cases.
- [How to Compress JPG](https://pdfrack.com/guides/how-to-compress-jpg/): Quantization table tuning and sweet spot optimization.
- [What DPI Means](https://pdfrack.com/guides/what-dpi-means/): Dots Per Inch vs Pixels Per Inch (PPI) for print and digital screens.
- [72 DPI vs 150 DPI vs 300 DPI vs 600 DPI](https://pdfrack.com/guides/72-dpi-vs-150-dpi-vs-300-dpi-vs-600-dpi/): Resolution comparison table and pixel calculations.
- [What is PDF Compression?](https://pdfrack.com/guides/what-is-pdf-compression/): PDF object stream structures and FlateDecode internals.
- [Lossless vs Lossy PDF Compression](https://pdfrack.com/guides/lossless-vs-lossy-pdf-compression/): Comparing exact stream compaction with lossy downsampling.
- [What Happens When a PDF is Rasterized?](https://pdfrack.com/guides/what-happens-when-a-pdf-is-rasterized/): Vector Bézier curve evaluation into discrete pixel grids.
- [Why Scanned PDFs are So Large](https://pdfrack.com/guides/why-scanned-pdfs-are-so-large/): Uncompressed bitmap wrappers, sensor noise, and 90% shrinkage methods.
- [Why Some PDFs Cannot Be Compressed](https://pdfrack.com/guides/why-some-pdfs-cannot-be-compressed/): Shannon entropy, pre-compressed streams, and workarounds.

## Privacy, Security & Compliance

- [Privacy Policy & GDPR Compliance](https://pdfrack.com/privacy/): Learn about our zero-data retention architecture, isolated in-memory processing, and automated 1-hour deletion policy.
- [Terms of Use](https://pdfrack.com/terms/): Read our acceptable use policy, intellectual property terms, and service agreement.

## Optional & Support

- [Contact Support & Bug Reports](https://pdfrack.com/contact/): Submit bug reports, request new PDF tools, or provide feedback directly to the engineering team.
- [Full LLM Documentation](https://pdfrack.com/llms-full.txt): Comprehensive extended documentation and tool usage guides for LLM agents.