Privacy First Developer Sandbox
100+ Free Online
Developer Tools
Powerful browser-based developer utilities. No sign-up required, no installation, and completely zero server footprints. 100% free forever.
Find any tool instantly
Search across our offline-ready utilities instantly. All data is processed locally.
Most Utilized
Popular Developer Tools
Word Counter
Count words, characters, sentences, and paragraphs in your text instantly. Get accurate reading time estimates for any content.
Character Counter
Count characters with and without spaces, track letter frequency, and check byte size for any text or string.
Case Converter
Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, and kebab-case instantly.
Remove Duplicates
Remove duplicate lines from any text instantly. Options for case-sensitive matching, trimming whitespace, and preserving original order.
Text Sorter
Sort lines of text alphabetically (A-Z or Z-A), by line length, numerically, or shuffle them randomly.
Reverse Text
Reverse text character-by-character, word-by-word, or line-by-line. Also flip text upside down with special Unicode characters.
Lorem Ipsum
Generate placeholder Lorem Ipsum text by paragraphs, sentences, or words. Perfect for design mockups and layout testing.
Slug Generator
Convert any title or text into a clean, SEO-friendly URL slug. Handles special characters, accents, and Unicode transliteration.
Explore Directory
Curated Tool Categories
Browse developer tools cleanly grouped by operational logic.
Text Tools
Manipulate text, convert cases, clean duplicate lines, and analyze length.
Developer Tools
Format/minify JSON and XML; decode JWTs; generate hashes and UUIDs.
Calculator Tools
Solve interest, loan EMIs, age differences, and BMI indexes.
Generator Tools
Create secure passwords, QR/Barcodes, and CSS layouts/gradients.
Image Tools
Compress, resize, crop, rotate, flip, convert, and view EXIF data.
Color Tools
Convert Hex, RGB, HSL, CSS colors, test contrast accessibility, and generate matching shades.
Converter Tools
Encode URLs/HTML elements, parse web links, and minify or beautify HTML, CSS, JS, and SQL databases.
Unit Tools
Convert length, weight, temperature, area, volume, speed, pressure, data storage, energy, and fuel economy units.
New Releases
Recently Added Utilities
Engineered Differently
Why Developers Choose QuizOxa Tools
Lightning Fast
Zero network round-trips. Calculations and parsing compile instantly in client-side memory.
Privacy First
Your data stays inside your browser. No databases, no logs, and no analytics footprints.
Runs Completely Offline
Once loaded, tools work in complete isolation. Perfect for air-gapped secure workflows.
Open Source Friendly
Clean, standards-compliant logic utilizing browser-native APIs and standard open specs.
Fully Responsive Design
Formatted specifically for high efficiency on desktop monitors, tablets, and phones.
Developer Resources
Latest Guides & Tutorials
Demystifying JWTs: How JSON Web Tokens Keep Apps Secure
Learn how JWTs are structured, why they are stateless, and how to safely decode and debug them in your browser without compromising your secret keys.
Mastering CSS Grid: Building Complex Responsive Layouts
CSS Grid revolutionized web design. Discover how to transition from Flexbox to Grid, define fractional columns, and rapidly prototype interfaces.
JSON Formatting & Validation: The Ultimate Guide
Understanding JSON structures, trailing comma errors, formatting conventions, and why local validation protects your developer secrets.
FAQ