FreeToolz Blog
Guides & How-Tos
Clear, practical explainers on the calculators and tools you use every day — the formulas, the examples, and how to get the right answer.
GuideThe 100 Best Free Online Tools (2026)A hand-picked guide to the internet's most useful free online tools across finance, health, conversion, text, image, PDF, and developer utilities—all browser-based, no signup.Read →GuideThe Best Free Online PDF Tools (Merge, Split, Convert)A roundup of the most useful free PDF tools that work right in your browser—merge, split, rotate, convert, add watermarks, and more without uploading your files.Read →GuideCompound Interest Explained (Formula, Examples, Power of Compounding)Compound interest is the mechanism behind wealth accumulation. Understand the formula, how frequency matters, and why starting early compounds your advantage.Read →GuideGST Calculator Guide: How to Add and Remove GST (India)Master GST calculation with step-by-step formulas, real examples, and insights into tax slabs. Calculate inclusive and exclusive prices instantly.Read →GuideHow EMI Is Calculated (Formula + Examples)EMI (Equated Monthly Instalment) is calculated using the reducing-balance formula. This guide explains the maths, shows real examples, and explores how tenure and interest rate affect your payments.Read →GuideHow to Calculate BMI (Formula, Chart & Examples)BMI (Body Mass Index) is a simple tool to assess weight relative to height. Learn the formula, interpretation, and why BMI has limitations.Read →GuideHow to Calculate Percentages (With Examples)Percentages are everywhere—from discounts to test scores to salary increases. Learn the core formulas and how to calculate them accurately with real-world examples.Read →GuideJPEG vs WebP: A Practical Guide to Faster ImagesWebP offers smaller file sizes and advanced features like transparency and animation, but JPEG remains widely supported. Here's how to choose and when to convert.Read →GuidePNG vs JPG: Which Image Format Should You Use?Choosing between PNG and JPG affects file size, quality, and compatibility. Understand the differences and when to use each format.Read →GuideSIP vs Lumpsum: Which Is Better for You?SIP spreads your investment over time to reduce risk, while lumpsum offers timing advantages if you have capital ready. Discover which strategy works best for your financial goals.Read →