FreeToolz Blog
Tutorials, cheatsheets, and how-to guides
Practical writing on the same problems our tools solve — images, JSON, regex, loans, AI prompts and more.
How to Compress Images Without Losing Quality
A practical guide to shrinking JPG and PNG files for the web while keeping them crisp — with the math, the tools, and the tradeoffs.
Read articleJSON Formatter vs Validator — Which Do You Need?
Pretty-printing JSON and validating JSON are different jobs. Here is when to use which, and how to fix the three errors you will hit most.
Read articleCalculate EMI the Right Way (with the formula)
Most EMI calculators hide the math. Here is the actual formula, a worked example, and the three numbers you should always check before signing.
Read articleA Regex Cheatsheet for Everyday Text Work
The 12 regex patterns that cover 90% of real-world cleanup tasks — emails, phone numbers, slugs, whitespace, duplicates.
Read articleWriting Better Prompts for AI Tools
Five small changes that make AI summaries, rewrites, and translations dramatically better — with examples you can copy.
Read articleQR Codes for Small Business — What Actually Works
How to design QR codes that people actually scan, from placement to error correction to landing-page etiquette.
Read articlePick Strong Passwords Without Hating Your Life
Length beats complexity. Here is a practical playbook for creating, storing and rotating passwords in 2026.
Read articleUnderstanding EMI, Total Interest and Tenure
Why lenders quote a low monthly EMI while quietly charging you tens of thousands in interest — and how to see through it.
Read articleCSV to JSON — The Quick Guide
The two-minute path from a spreadsheet export to a clean JSON payload your API can accept.
Read articleSEO Basics That Still Work in 2026
AI answers are eating the SERP, but the fundamentals still decide who ranks. Here is the shortlist.
Read articleGST and VAT — What the Math Actually Is
Adding tax to a price and extracting tax from a gross price are not the same operation. Here is the two-minute version.
Read articleHow to Choose a Good Domain Name (Checklist)
Ten questions that separate a domain you will love for a decade from one you will regret in six months.
Read articlePDF Workflows for Non-Technical Teams
Merge, split, compress and convert without installing Acrobat — a guide for teams that just need it to work.
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