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

Character Escaper→ Cron Expression Explainer→ HTML Live Preview→ HTTP Status Code Lookup→ JSON Comment Stripper→ JSON Diff Checker→ JSON Excel Converter→ JSON Extractor→ JSON Mock Generator→ JSON Path Finder→ JSON Schema Validator→ JSON Sort By Key Path→ JSON Table Converter→ JSON Tree Visualizer→ MIME Type Lookup→ Number Base Converter→ Regex Tester→ SQL Formatter→ UUID Generator→
Security

Security & Encoding

Base64 Encode / Decode→ HTML Entity Encode / Decode→ JWT Decoder→ MD5 Hash Generator→ Password Generator→ Password Strength Checker→ SHA256 / SHA1 Hash Generator→ URL Encode / Decode→
Text & Data

Text & Data

ASCII Code Lookup→ Base64 Toolbox→ Case Converter→ CSV ↔ Markdown Table→ cURL Command Builder→ JSON Formatter / Minifier→ JSON Schema Validator→ JSON ↔ CSV→ JSON ↔ XML→ JSON ↔ YAML→ Lorem Ipsum Generator→ Markdown ↔ HTML→ Remove Duplicate Lines→ Sort Lines→ Text Diff Viewer→ Unicode Code Point Lookup→ Whitespace Trimmer→
Image

Image & Color

Color Converter (HEX ↔ RGB ↔ HSL)→ Contrast Ratio Checker (WCAG)→ Favicon Generator→ Gradient Generator→ Image to Base64→ Opacity ↔ Hex Alpha→ Color Palette Generator→ SVG to PNG Converter→
Finance

Finance & Money

Compound Interest→ Discount Calculator→ EMI / Loan Calculator→ EMI vs Tax Savings→ GST Calculator→ Phased Investment→ Profit & Loss→ Simple Interest→ SIP Returns Estimator→ Split Bill Calculator→ Strategy Showdown→ Tip Calculator→
SEO

SEO & Web

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

Everyday Tools

Aspect Ratio Calculator→ Aspect Ratio Calculator→ BMI Calculator→ Coin Flip→ Dice Roller→ Digital Storage Converter→ Digital Storage Converter→ Fuel Efficiency Calculator→ Length Converter→ Random Number Generator→ Simon→ Speed Converter→ Temperature Converter→ Weight Converter→
File

PDF & File

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

Date & Time

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

Math Practice

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

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