Guides & tips
Syed Hurrar Hasan Rizvi
Morse Code Alphabet: Full Chart and How to Read and Write It
The full international Morse code chart for letters, numbers and punctuation, the timing rules, how to read and write messages, SOS, and tips for…
How to Convert CSV to JSON (and JSON to CSV): Step-by-Step Guide
What CSV and JSON are, how to convert between them step by step, how to handle quotes, commas, semicolons and line breaks, and how…
Roman Numerals: How to Read and Write Them (1 to 3,999)
The seven Roman numeral symbols, the subtractive rule, step-by-step examples for reading and writing any number from 1 to 3,999, and the mistakes to…
HEX vs RGB vs HSL: How to Convert Color Codes (With Examples)
What HEX, RGB and HSL color codes mean, how to convert between them by hand or instantly, and which format to use for websites,…
How to Calculate Age From Date of Birth in Years, Months and Days
Work out exact age from a date of birth in years, months and days — by hand, in Excel or Google Sheets, or instantly…
How to Convert JPG to PDF for Free (Phone, Windows, Mac and Online)
Five free ways to convert JPG images to PDF — online in your browser or with tools already on your Windows PC, Mac, iPhone…
How to Make a QR Code for a Link, Wi-Fi or Business Card (Free QR Code Generator)
Create a QR code that scans first time: choose the right content type, size, contrast and error correction, and test it before you print.
Loan EMI Formula: How to Calculate EMI With a Worked Example
The EMI formula explained with a step-by-step example, how tenure and interest rate change your total cost, and a free EMI calculator.
JWT Decoder Guide: What Is a JSON Web Token and How to Decode It Safely
Understand the three parts of a JSON Web Token, the common claims like exp and iat, and how to decode a JWT safely —…
Reduce PDF Size for Email: How to Compress a PDF Without Losing Quality
PDF too big to attach? Practical ways to shrink a PDF for email and upload limits — compress, split, remove pages or rebuild it…
WebP vs PNG vs JPG: Which Image Format Should You Use?
A plain-English comparison of WebP, PNG and JPG: quality, transparency, file size and browser support — and when to use each one.
On-Page SEO Checklist: Meta Tags, URL Slugs & Keyword Density
A practical on-page SEO checklist for beginners: write better title tags and meta descriptions, create clean URL slugs and use keywords naturally.