Guides & How-Tos
Tips, tutorials, and practical guides to help you get the most out of free online tools.
How to Resize Images for the Web
Best formats, compression settings, and resize techniques for fast, sharp images.
Read guide →UUID vs GUID: What's the Difference?
Are UUID and GUID really the same? Find out — plus how to generate them free.
Read guide →How to Calculate a Tip
Standard tip percentages, splitting the bill, and fast mental math tricks.
Read guide →How to Count Words Online
Why word count matters for SEO, readability, and writing quality.
Read guide →HEX to RGB Color Converter Guide
HEX, RGB, HSL, and CMYK explained — when to use each format.
Read guide →What Is Base64 Encoding?
Purpose, use cases, and why Base64 is not encryption.
Read guide →How to Calculate BMI
BMI formula, categories, and limitations explained clearly.
Read guide →How to Create a Strong Password
Password best practices, managers, and what makes a password secure.
Read guide →How to Create a QR Code
QR code uses, creation steps, and static vs dynamic types.
Read guide →What Is Morse Code?
History, alphabet, and modern uses of Morse code.
Read guide →How to Convert CSV to JSON
CSV vs JSON differences and how to convert between them.
Read guide →How Currency Exchange Rates Work
Why exchange rates change and how mid-market rate differs from bank rate.
Read guide →What Is Fake Data and When to Use It
Why fake test data is essential for development and GDPR compliance.
Read guide →What Is a Hash Function? MD5, SHA-256 Explained
How hash functions work and which algorithm to use for security.
Read guide →What Is a JWT Token?
JWT structure, payload visibility, and when to use it over sessions.
Read guide →How to Calculate Age from Date of Birth
Exact age in years, months, and days — and how it handles leap years.
Read guide →How to Find and Replace Text Online
Bulk text substitution with plain text or regex mode.
Read guide →How to Create CSS Gradients
Linear, radial, and conic gradient syntax with live examples.
Read guide →What Is HTML Encoding?
HTML entities, special characters, and why XSS requires encoding.
Read guide →How to Convert an Image to PDF
When to use PDF instead of JPG, and how to convert in seconds.
Read guide →What Is JSON? Beginner's Guide
JSON structure, data types, and common mistakes to avoid.
Read guide →How to Calculate Loan Payments
Monthly payment formula, APR vs interest rate, and amortization.
Read guide →What Is Lorem Ipsum?
The ancient origin of placeholder text and why designers swear by it.
Read guide →Markdown Guide for Beginners
Complete syntax cheat sheet: headings, bold, links, code blocks, tables.
Read guide →What Are SEO Meta Tags?
Which meta tags matter, Open Graph for social, and what to skip.
Read guide →Binary, Decimal & Hex Explained
Number systems guide with conversion table and use cases.
Read guide →How to Calculate Percentages
X% of Y, percentage change, discounts — with mental math tricks.
Read guide →Regex Tutorial for Beginners
Quick reference guide: character classes, quantifiers, and common patterns.
Read guide →URL Encoding Explained
Why spaces become %20 and which characters must be encoded.
Read guide →How to Convert Units of Measurement
Miles to km, kg to lbs, Celsius to Fahrenheit — common conversion table.
Read guide →Text Case Converter Guide
UPPER, lower, Title, camelCase, snake_case — when to use each.
Read guide →Roman Numerals Explained
The 7 symbols, subtractive notation, and conversion examples.
Read guide →What Is a Unix Timestamp?
Epoch time explained with conversion examples in multiple languages.
Read guide →What Is a Color Picker?
How to sample colors and understand HEX, RGB, HSL, and CMYK formats.
Read guide →How to Create a Countdown Timer
Events, launches, Pomodoro sessions — best uses for countdown timers.
Read guide →Scientific Calculator Guide
sin, cos, log, ln, exponents — every function explained with examples.
Read guide →How to Improve Text Readability
Flesch score, sentence length, active voice — practical tips for clearer writing.
Read guide →How to Summarize Text Online
Extractive vs abstractive summarization and when to use a text summarizer.
Read guide →How to Create a Favicon for Your Website
All sizes you need (.ico, .png, Apple Touch Icon) and how to add them to HTML.
Read guide →