Free Online Tools for Developers & Everyone
A growing collection of 29+ powerful tools — text formatters, generators, calculators, and SEO utilities. Everything runs in your browser. Your data never leaves your device.
Tool Categories
Browse our tools organized by category to quickly find what you need.
Text & Dev Tools
Format, encode, decode, and manipulate text and code with developer-focused utilities.
10 tools →
Generators
Generate placeholder content, fake data, slugs, names, colors, and gradients instantly.
6 tools →
Calculators
Calculate percentages, ages, date differences, unit conversions, and more.
6 tools →
SEO Tools
Generate meta tags, OpenGraph data, robots.txt, sitemaps, and analyze keyword density.
7 tools →
Featured Tools
Our most popular and powerful tools, hand-picked for you.
JSON Formatter & Validator
Format, beautify, and validate JSON data instantly. Detect syntax errors, fix indentation, and explore nested structures with a clean tree view.
Regex Tester
Write, test, and debug regular expressions in real time. See matches highlighted, capture groups extracted, and get plain-English explanations of your pattern.
UUID Generator
Generate universally unique identifiers (UUIDs) in versions 1, 4, and 7. Create single or bulk UUIDs with options for formatting and case.
Password Generator
Generate strong, cryptographically secure passwords with customizable length, character sets, and entropy estimation. Create memorable passphrases too.
Lorem Ipsum Generator
Generate customizable placeholder text in paragraphs, sentences, or words for your designs, mockups, and development projects.
Color Palette Generator
Create harmonious color palettes from scratch or from a base color using color theory rules, with export options for design and development.
Percentage Calculator
Calculate percentages instantly — find what percent one number is of another, compute percentage increase or decrease, and solve any percentage problem with ease.
Age Calculator
Calculate your exact age in years, months, and days from your date of birth, and discover upcoming birthday countdowns and milestone dates.
Unit Converter
Convert between hundreds of units across length, weight, temperature, volume, speed, area, and more with instant real-time results.
Meta Tag Generator
Generate optimized HTML meta tags for your web pages to improve search engine visibility and social media sharing.
SERP Preview Tool
Preview exactly how your web page will appear in Google search results before publishing, and optimize your title and description for maximum click-through rates.
Why Choose Sadhuji?
Built with simplicity, privacy, and speed in mind.
Privacy First
All processing happens in your browser. Your data never leaves your device — no uploads, no server-side processing, no tracking.
Lightning Fast
No server round-trips means instant results. Every tool runs locally with zero latency, even on slow connections.
Free Forever
Every tool is completely free with no hidden costs, premium tiers, or usage limits. Use as much as you need.
No Sign-up Required
Jump straight into using any tool. No accounts, no emails, no passwords — just open and start working.
Mobile Friendly
Fully responsive design that works beautifully on phones, tablets, and desktops. Use your tools anywhere.
29+ Tools & Growing
From text formatters and encoders to calculators and SEO utilities — new tools are added regularly.
Frequently Asked Questions
Got questions? We've got answers.