Free Online Tool Guides & Tutorials
Step-by-step guides explaining how to use online tools — formulas, examples, and tutorials in English, German, French and Spanish.
Calculator Guides
How to Calculate VAT
Step-by-step guide explaining VAT formulas, net-to-gross and gross-to-net calculations for all EU countries, with examples for Germany, France, and Spain.
How to Calculate Percentage
Master percentage calculations: how to find what percent X is of Y, percentage increase/decrease, and reverse percentage formulas — with worked examples.
Finance Guides
How to Verify an IBAN
Learn how IBAN validation works: country code structure, check digit MOD 97 algorithm, and what each segment of a European bank account number means.
How to Calculate Compound Interest
The compound interest formula explained: A = P(1 + r/n)^(nt), with examples for annual, monthly, and daily compounding, plus the Rule of 72 shortcut.
Text Tool Guides
How to Count Words Online
How word counting works in browsers: tokenization, what counts as a word, characters with/without spaces, and tips for hitting essay, SEO, and social media targets.
What is Lorem Ipsum?
The history and purpose of Lorem Ipsum placeholder text: its origins in Cicero's De Finibus, why typographers use it, and how to generate it for modern web projects.