Matthias Baertschi
Founder & Lead Engineer
Matthias is the founder and lead engineer of PDF Tools, working on the in-browser PDF processing pipeline with pdf-lib and pdfjs-dist. His focus is on client-side privacy: documents are processed locally and never uploaded to a server.
Areas of expertise
- PDF rendering (pdf-lib, pdfjs-dist)
- Client-side cryptography (AES-256, password derivation)
- Browser-based document workflows
- PDF/A and archival compliance
- OCR with tesseract.js
- Web Workers and streaming file handling
Articles by Matthias Baertschi
Troubleshooting Common PDF Problems and How to Fix Them
Practical solutions for the most frequent PDF issues including rendering errors, font problems, broken links, and corruption recovery.
Methods for Comparing PDF Documents Effectively
Different approaches to comparing PDFs, from visual side-by-side comparison to text-level diffing and structural analysis.
PDF Bookmarks and Document Navigation: A Complete Guide
How to create, edit, and organize PDF bookmarks for better document navigation, including automation techniques and accessibility benefits.
PDF Page Layout: N-up Printing, Booklets, and Poster Printing
Master page layout techniques including N-up printing for handouts, booklet imposition for binding, and tiling for large-format printing.
Legal Document Management with Bates Numbering
A comprehensive guide to Bates numbering for legal professionals, covering numbering schemes, implementation methods, and best practices for litigation support.
Redacting Sensitive Information from PDFs Safely
Learn the critical difference between true redaction and visual covering, plus step-by-step techniques for permanently removing sensitive content.
PDF Forms: A Complete Guide to Creation and Filling
Everything about creating interactive PDF forms, including field types, validation, calculations, and best practices for form filling.
Protecting Intellectual Property with PDF Watermarks
A practical guide to using watermarks for document protection, including types of watermarks, placement strategies, and legal considerations.
Batch Processing and Workflow Automation for PDF Documents
How to automate repetitive PDF tasks like merging, splitting, watermarking, and converting at scale using efficient batch processing techniques.
Converting Images to PDF: Format Guide and Best Practices
How to convert images to PDF with optimal quality, including choosing between JPEG, PNG, and TIFF, handling resolution, and color space considerations.
PDF Metadata and Privacy: What Your Documents Reveal About You
Discover what hidden information PDFs contain, including author names, editing history, GPS coordinates, and how to remove it before sharing.
Digital Signatures vs Electronic Signatures: What You Need to Know
Understanding the key differences between digital and electronic signatures, their legal validity, and when to use each type in PDF documents.
OCR and Scanned Documents: Making Paper Digital and Searchable
A practical guide to optical character recognition (OCR) for scanned PDFs, covering accuracy, language support, preprocessing, and best practices.
Professional Tips for Merging and Splitting PDF Documents
Advanced techniques and best practices for combining and separating PDF files while preserving bookmarks, links, and document structure.
PDF/A Compliance: Your Guide to Long-Term Document Archiving
Everything you need to know about PDF/A standards, conformance levels, and how to create documents that remain readable for decades.
PDF Accessibility: Creating Inclusive Documents for All Users
Comprehensive guide to making PDFs accessible to users with disabilities, covering tags, reading order, alt text, and WCAG compliance.
How to Optimize PDFs for Email and Web Distribution
Practical techniques for reducing PDF file size without sacrificing quality, including image compression, font subsetting, and web optimization.
Understanding PDF Compression: Balancing Quality and File Size
A deep dive into how PDF compression algorithms work, when to use lossy vs lossless compression, and how to find the right balance for your needs.
The Complete Guide to PDF Security and Encryption
Learn how PDF encryption works, the differences between AES and RC4, and how to protect your documents with passwords, permissions, and certificates.
The Benefits of Browser-Based PDF Processing
Why client-side, browser-based PDF tools offer privacy, convenience, and performance advantages over traditional desktop and cloud-based solutions.