Developer Tools Text Tools Data & File Tools Math & Calculators Visual & Color Tools Time & Date Tools General Utilities Fun & Novelty

QR Code Generator

Generate QR codes for URLs, text, contact info, and more.

QR Code Settings

Text or URL

Size

Generated QR Code

Developer Tools

JSON, Code Formatters, Validators, SQL Tools

JSON Prettifier
JSON Minifier
JSON Validator
JSON ↔ YAML Converter
JSON ↔ XML Converter
SQL Formatter
HTML Formatter/Minifier
CSS Formatter/Minifier
JS Formatter/Minifier
Markdown ↔ HTML Converter
Cron Expression Generator/Validator

Text Tools

Word Counter, Case Converter, Regex Tester

Word Counter
Character Counter
Line Counter
Case Converter
Duplicate Line Remover
Sort Lines Alphabetically
Text Diff / Compare
Regex Tester

Data & File Tools

CSV, PDF, Image Tools, Hash Generators

CSV Delimiter Changer
VCard Generator
File Diff Checker
File Checksum Generator (MD5/SHA, Web Crypto)
QR Code Generator
Barcode Generator
Image → Base64 Converter
Image Compressor
JSON ↔ CSV Converter
PDF Merger

Math & Calculators

Unit Converter, Currency, Scientific Calculator

Unit Converter
Number Base Converter
Percentage Calculator
Loan / Mortgage Calculator
BMI Calculator
Tip Calculator
Scientific Calculator
Compound Interest Calculator

Visual & Color Tools

Color Converter, Gradients, Accessibility

HEX ↔ RGB ↔ HSL Converter
Gradient Generator
Contrast Checker (WCAG)
Color Palette Extractor (from image)
Favicon Generator
Color Palette Generator

Time & Date Tools

Epoch Converter, Timezone, Countdown Timer

Epoch ↔ Human Date Converter
Date/Time Calculator
Age Calculator
Time Zone Converter
Countdown Timer
Stopwatch

General Utilities

Password Generator, UUID, URL Shortener

Password Generator
Password Strength Checker
UUID Generator
Lorem Ipsum Generator

Fun & Novelty

Lorem Ipsum, Creative Text Generators

Lorem Ipsum Generator (Extended)

About OpenTechTools

The most comprehensive collection of professional web-based utility tools for developers, designers, and power users. Over 54 production-ready tools covering code formatting, data conversion, mathematical calculations, visual design, and productivity enhancement. All tools run securely in your browser with no data transmission to external servers.

Quick Access

Sitemap
All Developer Tools
All Text Tools
All Calculators

Support & Legal

Contact Support
Privacy Policy
Terms of Service
GitHub

© 2025 OpenTechTools. All rights reserved. Professional utility tools for web development and productivity.