Every tool you need,
beautifully in one place.
Generate passwords, create QR codes, convert units, format JSON, calculate BMI and more. Fast, private, and crafted for creators, developers and everyday users.
Six categories, one toolbox
Every tool is organized into a clear category so you can find what you need in seconds.
Explore all 24 tools
Filter by category or search to find exactly what you need. Click any tool to launch it instantly — no sign-up, no waiting.
Word & Character Counter
Count words, characters, sentences and paragraphs live, with estimated reading time and keyword density.
Case Converter
Instantly convert text between UPPER CASE, lower case, Title Case, Sentence case, camelCase, snake_case, kebab-case and CONSTANT_CASE.
Lorem Ipsum Generator
Generate classic Lorem Ipsum placeholder text by paragraph, sentence or word count — perfect for mockups and design layouts.
Text Reverser & Flipper
Reverse text by characters, words or lines — plus upside-down text and mirrored text for creative effects.
Password Generator
Generate cryptographically strong passwords with customizable length, character sets and a real-time strength meter.
QR Code Generator
Generate scannable QR codes for URLs, text, phone numbers and more — customize size and error correction, then download as PNG.
UUID Generator
Generate cryptographically random RFC 4122 version 4 UUIDs — one or thousands, with optional hyphen formatting.
Random Number Generator
Generate random integers within a custom range — single or bulk, with options for uniqueness, sorting and a secure mode.
Color Palette Generator
Generate harmonious color palettes with HEX, RGB and HSL values — perfect for design, branding and web projects.
Base64 Encoder / Decoder
Convert text to Base64 and decode Base64 back to readable text — supports Unicode and live error detection.
URL Encoder / Decoder
URL-encode (percent-encode) text so it is safe inside URLs, and decode percent-encoded URLs back to readable text.
HTML Entity Encoder / Decoder
Convert characters like <, >, & and quotes to HTML entities — and decode entities back to characters — to prevent XSS and display issues.
Number Base Converter
Convert numbers between binary, octal, decimal and hexadecimal in real time, with support for large values and fractional input.
Unit Converter
Convert between metric and imperial units for length, mass and temperature with a clean, fast, any-direction interface.
BMI Calculator
Calculate your Body Mass Index in metric or imperial units, see your category and the healthy weight range for your height.
Age Calculator
Calculate exact age in years, months and days, plus total days lived and a countdown to your next birthday.
Percentage Calculator
Calculate what is X% of Y, X is what percent of Y, and percentage increase/decrease between two values — all in one tool.
Loan / EMI Calculator
Calculate monthly loan payments (EMI), total interest paid and total repayment amount for any loan with a fixed interest rate.
Tip Calculator
Calculate the tip amount, total bill and per-person share when splitting a check — with common tip presets and rounding.
Discount Calculator
Calculate the final price after a discount, how much you save, or work backwards from a sale price to find the original.
JSON Formatter & Validator
Format and validate JSON with clear error messages, plus one-click minify for compact output. Indentation is configurable.
CSS Minifier
Minify CSS by stripping comments and whitespace — see the before/after size and the percentage savings live.
Hash Generator
Generate cryptographic hashes (MD5, SHA-1, SHA-256, SHA-512) for any text — all four algorithms computed at once.
Color Picker & Converter
Pick any color and get its HEX, RGB and HSL values, plus lighter and darker shades — perfect for design and CSS.
Why people choose Eqii
Built on six principles that make everyday tools a pleasure to use.
Private by design
Every tool runs in your browser. Your text, passwords, and data never touch a server — there is no server to leak them.
Instant results
No spinners, no waiting, no round-trips. Type and see your result immediately, every single time.
No tracking, no sign-up
No account walls, no email harvesters, no dark patterns. Just open the page and use the tools.
Genuinely free
All 24+ tools are free for everyone, forever. No premium tier, no usage caps, no surprise paywalls.
Works everywhere
Responsive on phone, tablet, and desktop. Works offline once loaded. No app install required.
Crafted with care
Every tool has original documentation, how-to guides, and FAQs — written by humans, for humans.
Guides & deep dives
In-depth, original articles to help you get the most out of every tool — written by humans, for humans.
How to Create a Strong Password You'll Actually Remember
Password strength is about entropy, not complexity tricks. Here is a practical framework for building passwords that resist brute force without driving you crazy.
Understanding BMI: What the Number Really Means for Your Health
BMI is a 200-year-old statistical formula that became a medical screening tool. Here is what it measures, where it fails, and what to use instead.
QR Codes Explained: Uses, Security, and Best Practices
A QR code is a 1990s automotive part-tracking tool that became the bridge between physical and digital. Here is how it works, what can go wrong, and how to use it well.
Base64 Encoding: What It Is and When to Use It
Base64 is a transport encoding, not encryption and not compression. Here is how the algorithm works, where it belongs, and where it is the wrong tool.
The Complete Guide to Unit Conversion
From the Mars Climate Orbiter to medication overdoses, unit errors cost real money and real lives. A practical guide to getting conversions right.
JSON vs CSV: Choosing the Right Data Format
CSV and JSON solve different problems. Picking the wrong one will cost you storage, parsing time, and developer sanity. Here is how to choose.
Color Theory Basics for Developers and Designers
Color on screens is additive light, not subtractive paint. From RGB and HSL to WCAG contrast ratios, here is the practical foundation for choosing colors well.
Loan EMI Explained: How Interest Really Works
An EMI looks like a flat monthly payment, but it is heavily front-loaded with interest. Understanding the math changes how you borrow and prepay.
Choosing and Using a Password Manager: A Practical Guide
With 100+ online accounts per person, reuse is the real threat. A password manager reduces the problem to one strong passphrase. Here is how to choose and deploy one.
HTTP Status Codes Explained: What Every Developer Should Know
From 200 OK to 418 I'm a Teapot, HTTP status codes are the protocol's vocabulary for what happened. Here is every code you will meet, and how to use them well.
Character Encoding: ASCII, UTF-8, and Why Mojibake Happens
The same bytes can mean different things to different systems. From 7-bit ASCII to modern UTF-8, here is the story of how text actually works on computers.
Data Privacy Basics: How to Keep Your Information Safe Online
Privacy is not secrecy, and it is not a binary state. A practical framework for deciding what to protect, from whom, and how — without going off the grid.
SEO Fundamentals: How Search Engines Actually Work
SEO is not tricks; it is making sure search engines can crawl, index, and rank your content. Here is the practical foundation, free of the snake oil.
Metric vs Imperial: Why the World Still Uses Two Systems
The metric system is the global default, but the imperial system still rules American roads, kitchens, and construction sites. Here is why, and how to live with both.
Understanding Interest Rates: APR, APY, and Compound Growth
Interest is the price of money over time. From simple to compound, nominal to real, APR to APY, here is what every borrower and saver should know.
Regular Expressions for Beginners: A Practical Starter Guide
Regex looks like line noise until you learn the vocabulary. Here is the practical foundation: anchors, classes, quantifiers, groups, and the patterns you will actually use.
In-depth guides & tutorials
Long-form, expert-written tutorials — each 2,000+ words — covering the fundamentals developers and designers need.
The Complete Web Developer Toolkit for 2025
Editors, version control, package managers, linters, build tools, testing, debugging, and deployment. A working map of the tools a professional web developer touches every day, with the reasoning behind each choice.
Secure Coding Practices Every Developer Should Follow
OWASP Top 10 in practical terms: injection, broken auth, XSS, CSRF, SSRF, and insecure deserialization. Plus the principles — input validation, output encoding, least privilege, secrets management — that hold them all together.
Modern CSS Layout: Flexbox, Grid, and Container Queries
Flexbox, CSS Grid, subgrid, container queries, logical properties, and the new viewport units. A practical tour of the layout system modern CSS actually offers, with a decision tree for choosing the right tool.
Mastering Asynchronous JavaScript: Callbacks, Promises, and Async/Await
From the pyramid of doom to async/await, plus the event loop, microtasks, and the pitfalls that catch senior developers off guard. A practical tour of how JavaScript actually handles concurrency.
Web Accessibility Fundamentals: Building for Everyone
Semantic HTML, ARIA done right, keyboard navigation, focus management, color contrast, screen reader testing, and prefers-reduced-motion. The accessibility habits that should be in every developer's default toolkit.
Website Performance Optimization: A Practical Guide
Core Web Vitals (LCP, INP, CLS), measurement with Lighthouse and RUM, image optimization, code splitting, tree shaking, caching strategies, font performance, and the HTTP/2 and HTTP/3 transport layer.
Technology comparisons
Balanced, opinionated comparisons that help you pick the right tool for the job — with clear recommendations.
JSON vs XML: Which Data Format Should You Use?
JSON won the web, but XML still powers enterprise, office files, and SVG. A practical comparison of syntax, verbosity, schema, parsing, and ecosystem — with a clear recommendation.
REST vs GraphQL: Choosing the Right API Style
REST aligns with HTTP; GraphQL lets clients shape their own queries. A senior-engineer comparison of architecture, fetching, caching, versioning, and tooling — with a clear recommendation.
SQL vs NoSQL: Picking the Right Database
Relational vs document, key-value, and graph stores. ACID vs BASE, schema flexibility, scaling, and real-world examples (Postgres, MongoDB, Redis) — with a clear recommendation.
JWT vs Session Cookies: Authentication Compared
Stateless JWTs vs stateful session cookies — storage, revocation, size, CSRF vs XSS tradeoffs, and when each approach wins. A security-focused comparison.
HEX vs RGB vs HSL: Choosing a Color Format
Compactness, readability, programmatic manipulation, and transparency support. Which color format wins for which job — and why CSS Color 4 changed the calculus.
SHA-256 vs MD5: Why Hash Algorithms Matter
MD5 has been broken since 2004, yet it still ships in checksums. A security-focused comparison of speed, output size, and use cases — and why MD5 must never protect passwords.
GET vs POST: When to Use Each HTTP Method
Safe, idempotent, cacheable, bookmarkable. A precise comparison of GET and POST semantics, bodies, caching, URL length, and REST conventions — with a clear rule for each case.
em vs rem vs px: CSS Units Compared
Absolute pixels, compounding ems, root-relative rems. Which CSS unit wins for typography, spacing, and accessibility — and why px for body text is a quiet accessibility bug.
Frequently asked questions
Everything you need to know about Eqii and how the tools work.
Yes. Every one of the 24+ tools on Eqii is completely free, with no sign-up, no premium tier, and no usage limits. There are no hidden costs. The site is supported by advertising, which is clearly separated from the tool content.