Free How-To Guides — Learn It, Then Do It
Every guide teaches one task step by step, then drops you straight into the free tool that does it. No sign-up, no fluff — read for 5 minutes, solve it in seconds.
5 min read · Beginner to Advanced
How to Format JSON Online
Beautify, validate & minify JSON in seconds with examples.
Read guide →5 min read · Everyone
GST Calculator India
Add & remove 5%-28% GST with formulas and examples.
Read guide →5 min read · Everyone
BMI Calculator: Formula, Chart & Range
Calculate BMI and understand what your number means.
Read guide →4 min read · Students & Writers
Word Counter: Words & Reading Time
Hit essay and blog limits with live counts.
Read guide →4 min read · Everyone
QR Codes for URL, WiFi & UPI
Share links, WiFi and payments with one scan.
Read guide →4 min read · Everyone
Strong Passwords Made Easy
Generate uncrackable passwords in one click.
Read guide →4 min read · Students
Percentages: Find, Change & Difference
Marks, discounts and hikes with 3 formulas.
Read guide →4 min read · Developers
Base64 Encode & Decode
Encode data for URLs, JSON and tokens.
Read guide →How our guides work
- Pick a guide below — each covers one real task end to end.
- Follow the numbered steps with the worked examples.
- Click the tool button to open the free calculator or formatter.
- Paste your own input and get instant results in your browser.
Why learn on NeXiilo?
Unlike generic blogs, every NeXiilo guide pairs with a working tool — the JSON Formatter for the JSON guide, the GST Calculator for the GST guide. You never copy formulas into a spreadsheet; you click through and calculate. More guides ship regularly — browse all tools meanwhile.
Guides FAQ
Are these guides free?
Yes. Every guide is free, and every linked tool is free with no sign-up required.
Do I need to install anything?
No. All NeXiilo tools run in your browser. Read the guide, click through to the tool, paste your input.
Is my data uploaded when I use the tools?
No. Processing happens locally in your browser. Nothing leaves your device.