voidrab
voidrab is the software and document-processing practice of Thomas Karner, providing secure tools for PDF and document processing. Its products emphasize browser-local or open-source processing, collaboration, document comparison, and PDF/A validation/conversion.
At a Glance
- Project teams
- Education and e-learning
- Sales and consulting
- Remote-work teams
- +5 more
AI Tools by voidrab
(1)
gopdfrab
Go Library for PDF/A Compliance
Discussions
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Latest News
gopdfrab repository merged contribution-onboarding documentation in pull request #56.
Thomas Karner published 'voidrab: Smarte Dokumentenverarbeitung', introducing the PDF Co-Viewer and PDF Pattern Matcher and explaining their technology and use cases.
The voidrab blog published 'Building a Collaborative PDF Viewer', covering WebSocket-based collaborative PDF viewing with Nuxt and Cloudflare Workers.
The gopdfrab repository was created with its initial commit for PDF/A processing in Go.
Products & Services
A browser-based real-time collaboration tool for viewing PDFs together. A host uploads a PDF and participants join by room ID; synchronized scrolling/page changes, shared highlighting, host-transfer requests, and WebSocket-based coordination let teams review the same document without screen sharing or installation.
A browser-based PDF comparison and analysis tool that uses regular expressions and OCR to find and compare values such as IBANs, email addresses, invoice numbers, UUIDs, and custom patterns across reference and comparison document stacks. It supports scanned documents, batch comparison, discrepancy reporting, and CSV export; processing runs locally in the browser.
An open-source pure-Go library and CLI for PDF structural checks, PDF/A-1b verification and conversion, encrypted-PDF decryption, diagnostics, and browser execution through WebAssembly. It is dual-licensed under AGPL 3.0 and a commercial license for closed-source use.
Market Position
voidrab positions itself around privacy-conscious, secure document processing: the PDF Pattern Matcher runs locally in the browser, the Co-Viewer avoids screen-sharing overhead, and gopdfrab is a pure-Go, static-binary alternative for PDF/A processing. gopdfrab's published benchmark compares it directly with Apache PDFBox Preflight and veraPDF, reporting higher throughput and lower cold latency on its stated corpus.
Leadership
Founders
Thomas Karner, MSc
Owner and sole proprietor. He has worked as a software engineer at NTBS since July 2022 and at fiskaly from July 2020 to July 2022; he holds master's degrees in Wirtschaftsinformatik / IT, Digitalization and Sustainability from FH Technikum Wien and Hochschule Luzern, a BSc in Wirtschaftsinformatik from FH Technikum Wien, and an informatics Matura from HTL Wiener Neustadt.
Executive Team
Thomas Karner, MSc
Owner / Software Engineer and Consultant
Self-employed since September 2025; software engineer at NTBS since July 2022 and previously at fiskaly from July 2020 to July 2022. His stated expertise covers application development, digitization, process automation, Java, Go, Python, and web development.
Business Model
Pricing Tiers
The voidrab product article invites inquiries for commercial use of the PDF tools and for implementation support; no public price is listed.
Target Markets
- Project teams
- Education and e-learning
- Sales and consulting
- Remote-work teams
- Accounting and controlling departments
- Human resources
- Project-team document reviews and proofreading
- Education and e-learning sessions
- Sales and consulting walkthroughs of contracts or presentations
- Remote-work document discussions without full meeting software
- Accounting and controlling reconciliation of statements and invoices
- HR searching of applicant document pools