Free Online Tools & Calculators — Tinker

Tinker

// tools · calculators · practice games — no signup, no fluff

0 tools that just work
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Dev

Developer

CPU Scheduling Visualizer→ CSS Animation Builder→ IP Subnetting — Interactive Guide→ JSON to TypeScript Types→ Logic Gate Simulator→ Number Base Converter→ Advanced JSON Processor→ Base64 Toolbox→ Cron Expression Explainer→ CSS Flexbox Playground→ CSS Grid Builder→ CSV ↔ Markdown Table→ cURL Command Builder→ ENV File Editor→ HTML Live Preview→ HTTP Status Code Lookup→ IP Address & Masks→ JSON Comment Stripper→ JSON Diff Checker→ JSON Format Converter→ JSON Formatter / Minifier→ JSON Merge Tool→ JSON Mock Generator→ JSON Schema Tools→ JSON Tree Visualizer→ Lorem Ipsum Generator→ Markdown ↔ HTML→ MIME Type Lookup→ Regex Tester→ SQL Formatter→ Text & String Utilities→ Text Diff Viewer→ Tower of Hanoi — Recursion Visualizer→ Unicode & Emoji Inspector→ UUID Generator→
Security

Security & Encoding

HTML Entity Encode / Decode→ HTTP Header Analyser→ JWT Builder→ JWT Decoder→ MD5 Hash Generator→ Password Generator→ Password Strength Checker→ SHA256 / SHA1 Hash Generator→ URL Encode / Decode→
Image

Image & Color

Color Wheel→ Color Converter (HEX ↔ RGB ↔ HSL)→ Color Explorer→ Color Palette Generator→ Contrast Ratio Checker (WCAG)→ CSS Gradient Animator→ Favicon Generator→ Gradient Generator→ Image to Base64→ Logo to Site→ Opacity ↔ Hex Alpha→ SVG to PNG Converter→ Color Swatch Pencils→
Finance

Finance & Money

Compound Interest→ Discount Calculator→ EMI / Loan Calculator→ EMI vs Tax Savings→ GST Calculator→ Phased Investment→ Provident Fund (EPF)→ Profit & Loss→ Simple Interest→ SIP Returns Estimator→ Split Bill Calculator→ Strategy Showdown→ Tip Calculator→
Business

Business

PMEGP Business Idea Explorer→
SEO

SEO & Web

Meta Tag Previewer→ Open Graph Preview→ Reading Time Estimator→ Robots.txt Validator→ Text to Slug→ Word / Character Count→
Everyday

Everyday Tools

Area, Perimeter & Volume→ Aspect Ratio Calculator→ BMI Calculator→ Chess Timer→ Coin Flip→ Dice Roller→ Emoji Unicode Finder→ Fuel Efficiency Calculator→ Length Converter→ Random Number Generator→ Simon Game→ Speed Converter→ Spelling Builder→ Temperature Converter→ Weight Converter→ Worksheet — Attendance→ Worksheet — Chores→ Worksheet — Cover Page Designer→ Worksheet — Monthly→ Worksheet — Weekly→
File

PDF & File

Image Compressor→ Image Resizer→ Image to PDF→ Markdown to PDF converter→ PDF to Images→ QR Code Generator→
Date

Date & Time

Age Calculator→ Countdown Timer→ Date Toolkit→ Unix Timestamp→
Practice

Math Practice

Addition Dash→ Division Frenzy→ Guess the Fraction→ Missing Operator→ Mixed Operations→ Multiplication Dash→ Subtraction Frenzy→ Times Tables Blitz→
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About Tinker

Tinker is a collection of free, browser-based tools that work instantly — no account, no install, no data sent to a server. Everything runs locally in your browser.

From JSON formatters and regex testers for developers, to EMI calculators and SIP estimators for financial planning, to age calculators and countdown timers for everyday use — each tool is purpose-built to give you an answer fast without getting in the way.

Search above or click any category pill to find a tool. All tools are free, forever.

© 2026, Tinker - tools · calculators · practice games