Focused tools for technical, business and everyday work.
PROFENG Toolbox is a growing library of free online calculators, developer utilities, document tools and practical decision guides. The goal is simple: make common tasks faster without forcing users through accounts, unnecessary setup or oversized software.
What you can find here
The library covers finance and business calculations, SaaS and e-commerce metrics, developer and data transformations, cloud cost planning, PDF workflows, engineering and construction quantities, cybersecurity checklists, commercial insurance topics, legal and compliance guides, real-estate analysis and everyday utilities.
Why the site is organized by category
With nearly two hundred resources, a single flat list becomes difficult to use. Toolbox therefore groups related tools into crawlable category pages, while search and filters help users move quickly from a broad problem to a focused utility.
Browser-first where practical
Many calculators and lightweight transformations run directly in the browser. File tools explain their processing model and important limitations. High-stakes financial, legal, safety, engineering or regulatory outputs should always be checked against the original source information and applicable professional requirements.