Utility Guides
Step-by-step guides for online utilities. Generate barcodes, UUIDs, JWT tokens, hashes, passwords. Use calculators for BMI, loans, percentages, unit conversions, and more.
Featured Utility Guides
The most popular utility guides for developers, designers, and everyday tasks.
Generate UUIDs
Generate random UUID v4 strings for databases, APIs, and development. Learn UUID formats and when to use them. All generation happens locally in your browser.
Create Strong Passwords
Create strong, random passwords for security. Learn password best practices, entropy, and how to generate memorable yet secure passwords.
QR Code Marketing Guide
Create QR codes for links, contact info, or text. Learn best practices for QR code design, placement, and tracking for marketing campaigns.
BMI Calculator Guide
Calculate your BMI with metric or imperial units. Understand BMI categories, limitations, and how to interpret your results for health tracking.
All Utility Guides
Browse our complete collection of generator, calculator, and developer utility tutorials.
QR Code Generator
Create QR codes for links, contact info, or text.
Password Generator
Create strong, random passwords for security.
Lorem Ipsum Generator
Generate placeholder text for design and development.
URL Slug Generator
Convert titles into clean, SEO-friendly URL slugs.
JSON Formatter
Format, validate, and minify JSON data.
Color Picker & Converter
Pick colors and convert between HEX, RGB, HSL, CMYK.
Age Calculator
Calculate exact age in years, months, days, and more.
UUID Generator
Generate random UUIDs for development use.
Barcode Generator
Generate Code 128, Code 39, EAN-13, and UPC-A barcodes.
Random Name Generator
Generate male, female, and neutral names from multiple countries.
Random Number Generator
Generate random numbers with custom ranges and precision.
UUID v7 Generator
Generate time-ordered UUID v7 identifiers.
Password Strength Checker
Analyze password strength and entropy.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes.
Hash Checker
Verify data integrity with hash comparison.
JWT Decoder
Decode JWT tokens and inspect contents locally.
JWT Generator
Build and generate JWT tokens for development.
Cron Expression Generator
Build cron expressions with visual form builder.
Unix Timestamp Converter
Convert timestamps to dates and back.
Unit Converter
Convert length, weight, temperature, and more.
Percentage Calculator
Calculate percentages in multiple modes.
BMI Calculator
Calculate BMI with metric or imperial units.
Loan Calculator
Calculate payments and amortization schedules.
Favicon Generator
Create favicons and app icons from any image.
HTML Minifier
Compress HTML files by removing whitespace and comments.
CSS Minifier
Minify CSS files to reduce load times.
JS Minifier
Compress JavaScript files for production.
Readability Checker
Analyze text readability with Flesch-Kincaid scores.
Meme Generator
Create custom memes with text overlays online.
Keyword Generator
Generate keywords from any text for SEO and analysis.
Frequently Asked Questions
How do I generate a barcode?
Use the Barcode Generator tool. Select a barcode type (Code 128, Code 39, EAN-13, or UPC-A), enter your data, and the barcode is generated instantly in your browser. No server uploads required.
What is a UUID and when should I use it?
A UUID (Universally Unique Identifier) is a 128-bit identifier used for database primary keys, API tokens, and distributed systems. Use UUID v4 for random IDs and UUID v7 for time-ordered identifiers.
How do I decode a JWT token?
Use the JWT Decoder tool. Paste your JWT token and the tool decodes the header, payload, and signature. All decoding happens locally in your browser — no data is sent to any server.
What hash algorithms are supported?
The Hash Generator supports MD5, SHA-1, SHA-256, and SHA-512. The Hash Checker lets you compare hashes to verify data integrity. All hashing is done locally in your browser.
How do I calculate my BMI or loan payments?
Use the BMI Calculator for health metrics with metric or imperial units. The Loan Calculator computes monthly payments and amortization schedules. The Percentage Calculator handles multiple calculation modes. All calculations are done locally.