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Curated for
Converters (23)
- Length Converter
- Weight Converter
- Temperature Converter
- Volume Converter
- Area Converter
- Speed Converter
- Time Duration Converter
- Data Size Converter
- Energy Converter
- Power Converter
- Pressure Converter
- Angle Converter
- Frequency Converter
- Mass Flow Converter
- Density Converter
- Torque Converter
- Force Converter
- Viscosity Converter
- Bandwidth Converter
- Illuminance Converter
- Sound Pressure Converter
- Radiation Dose Converter
- Angular Velocity Converter
Productivity (39)
- Currency Converter
- Crypto Converter
- Tip Calculator
- VAT / GST / Sales Tax Calculator
- Loan / EMI Calculator
- Mortgage Calculator
- Compound Interest Calculator
- Inflation Calculator
- Salary Converter
- Discount Calculator
- Fuel Cost Calculator
- Savings Goal Calculator
- Retirement Savings Calculator
- Car Loan / Auto EMI Calculator
- Timezone Converter
- Age Calculator
- Date Difference Calculator
- Working Days Calculator
- Timestamp Converter
- Cron Explainer
- Holiday Calculator
- Meeting Time Finder
- Countdown Timer
- BMI Calculator
- BMR & TDEE Calculator
- Body Fat Percentage Estimator
- Ideal Weight Calculator
- Daily Calorie Needs Calculator
- Macronutrient Calculator
- Running Pace Calculator
- Walking / Cycling Distance Calculator
- Recipe Unit Converter
- Oven Temperature Converter
- Recipe Scaler
- Ingredient Substitutions
- Font Size Converter
- Line Height Calculator
- Letter Spacing Calculator
- Pomodoro Timer
Formatters & Code (122)
- JSON ⇄ XML Converter
- JSON Formatter & Validator
- CSV ⇄ JSON Converter
- YAML ⇄ JSON Converter
- SQL Formatter
- XML Formatter & Validator
- HTML Formatter
- CSS Formatter
- JavaScript / TypeScript Formatter
- YAML Formatter
- Markdown Formatter
- GraphQL Formatter
- JSON5 Formatter
- Regex Tester
- Case Converter
- Text Diff Checker
- Word & Character Counter
- Sort Lines
- Remove Duplicate Lines
- Reverse Text
- Find & Replace
- HTML ⇄ Markdown Converter
- JSON ⇄ Excel Converter
- Character Counter
- Remove Spaces
- AI Paraphraser
- Text Repeater
- Line Break Converter
- TOML ⇄ JSON Converter
- INI ⇄ JSON Converter
- SQL → NoSQL Schema Converter
- Git Diff Viewer
- OpenAPI / Swagger Validator
- Binary ⇄ Text Converter
- Readability Score
- Sentiment Analyzer
- API Request Builder
- Performance Audit
- Accessibility Checker
- Keyword Density Analyzer
- Plagiarism Checker (local)
- JSON to TypeScript Interface
- JSON to C# Class
- JSON to Java POJO
- JSON to Python Dataclass
- JSON to Go Struct
- JSON to Kotlin Data Class
- JSON to JSON Schema
- XML to TypeScript Interface
- JSON to Rust Struct
- JSON to PHP Class / DTO
- JSON to C++ Struct
- JSON to Swift Codable
- JSON to Dart / Flutter Model
- JSON to C# Record
- JSON to Scala Case Class
- JSON to Elixir Struct
- JSON to Haskell Data Type
- CSV to SQL INSERT Statements
- JSON to React Hook Form + Zod
- JSON to Next.js Server Action
- JSON to Prisma Schema Model
- JSON to Drizzle ORM Schema
- JSON to TypeORM Entity
- JSON to Mongoose Schema + Model
- JSON to tRPC Router
- JSON to GraphQL Type + Resolver
- Docker Compose Generator
- Kubernetes Deployment + Service
- GitHub Actions Workflow
- GitLab CI Pipeline
- Terraform Module Stub
- Dockerfile Best-Practice Generator
- Helm Chart Skeleton
- CSS Minifier
- JavaScript Minifier
- HTML Minifier
- User Agent Parser
- Tailwind Config Generator
- React Component Generator
- Vite Config Generator
- esbuild / Rollup Config Generator
- Webpack → Vite Migration Helper
- Bundle Size Analyzer (Simulator)
- Algorithm Visualizer
- Regex Playground
- Commit Message Generator
- Changelog Generator
- License Generator
- ER Diagram → SQL
- SQL Query Explainer
- NoSQL → SQL Migration Helper
- SQL Index Recommendation
- PostgreSQL → MySQL Converter
- OpenAPI 3.1 YAML ⇄ JSON
- OpenAPI → TypeScript Axios Client
- OpenAPI → React Query Hooks
- OpenAPI → Postman Collection
- GraphQL SDL ⇄ TypeScript Types
- JSON Schema → Zod / Valibot / ArkType
- SQL DDL → Prisma / Drizzle Models
- gRPC .proto ⇄ JSON Schema
- Hex / Binary File Editor
- Byte Array Utilities
- CSS → Tailwind JIT Converter
- shadcn/ui Component Generator
- Next.js App Router Page Generator
- SvelteKit Component + Page Generator
- Vue 3 + Pinia Store Generator
- Storybook Story Generator
- Jest Test Case Generator
- Playwright / Cypress Test Generator
- Pact Contract Generator
- Snapshot Test Previewer
- Accessibility Test Runner (axe-core)
- Protobuf Playground
- MessagePack Encoder / Decoder
- Apache Avro Schema Tools
- CSV → JSON Dataset
- CSV Statistical Analyzer
- ONNX Model Metadata
- TensorFlow.js Model Loader
Encoders & Crypto (21)
- Base64 Encode / Decode
- JWT Decoder
- URL Encode / Decode
- Hash Generator (SHA-1/256/384/512)
- HTML Entities Encode / Decode
- Hex / Binary / Octal Converter
- ROT13 / Caesar Cipher
- Morse Code Translator
- HMAC Generator
- Data URL Converter
- JWT Creator (HS256)
- Base32 Encode & Decode
- ASCII / Unicode Converter
- File Hash Calculator
- AES File Encrypt / Decrypt
- Base58 & Bech32 Encoder
- RSA / ECDSA Key Pair Generator
- Ed25519 Key Generator & Signer
- JWT Signer (Pro)
- X.509 Certificate Decoder
- PGP Encrypt / Decrypt
Generators (12)
Files & Media (67)
- SVG Optimizer
- Image Format Converter
- PNG to JPG Converter
- JPG to PNG Converter
- PNG to WebP Converter
- WebP to PNG Converter
- JPG to WebP Converter
- WebP to JPG Converter
- HEIC to JPG Converter
- AVIF to JPG Converter
- AVIF to PNG Converter
- HEIC to PNG Converter
- HEIC to PDF Converter
- JFIF to PNG Converter
- JFIF to JPG Converter
- JPG to PDF Converter
- PNG to PDF Converter
- Image to PDF Converter
- PNG to SVG Vector Tracer
- Image Resizer
- Image Compressor
- Image Cropper
- Image Rotator & Flipper
- EXIF Metadata Stripper
- SVG to PNG Converter
- Favicon Generator
- PDF Merger
- PDF Splitter
- PDF to Images
- PDF Text Extractor
- CSV ⇄ Excel Converter
- PDF Compressor
- Checksum Calculator
- PDF Watermark Adder
- File Compressor
- PDF to Word Converter
- Image Editor
- Batch Image Processor
- EPUB Validator
- Markdown to EPUB
- PDF to EPUB
- EPUB to PDF
- Audio Waveform Visualizer
- MP3 ID3 Tag Editor
- Subtitle Converter (.srt ↔ .vtt)
- Video Frame Extractor
- Video Thumbnail Generator
- Batch File Compressor
- File Splitter & Joiner
- Bulk File Renamer
- PDF Form Filler
- PDF Page Numbers
- PDF Page Rotator
- Audio Format Converter
- Audio Trimmer & Cutter
- Audio Volume Normalizer
- Audio Speed Changer
- Audio Pitch Changer
- Audio Fade In / Fade Out
- Audio Reverse
- Extract Audio from Video
- Video Format Converter
- Video Trimmer & Cutter
- Video Compressor
- Video Cropper & Resizer
- Video to GIF Converter
- GIF to Video Converter
Design & Color (19)
- Color Converter (HEX/RGB/HSL/OKLCH)
- Contrast Checker (WCAG)
- Gradient Generator
- Box Shadow Generator
- Border Radius Generator
- Cubic Bezier Editor
- CSS Units Converter
- Aspect Ratio Calculator
- Tailwind Color Finder
- Image Color Picker & Palette
- Color Blindness Simulator
- CSS Animation Generator
- CSS Filter Generator
- CSS Grid Layout Generator
- Font Pairing Suggester
- Glassmorphism Generator
- Neumorphism Generator
- Advanced Box Shadow Editor
- Open Graph / Twitter Card Generator
Blog
- Why kitchen recipes don't scale linearly (and the salt floor that breaks everything)
- BMI is a 200-year-old metric — what it actually tells you (and what it doesn't)
- Cost per kilometre — the only fuel number worth tracking
- PDF vs EPUB: when each one wins
- Font size, line height, letter spacing — the typography triangle
- The pomodoro myth — what Cirillo actually said vs the watered-down version
- Base64 encoding across 5 languages: JavaScript, Python, Go, Rust, PHP
- Hashing in 2026: SHA-256, HMAC and PBKDF2 across Node, Python, Go, Rust
- Generating UUIDs across languages: stdlib vs libraries in 2026
- HTTP status codes: the only reference you'll need
- ISO 8601 date format cheatsheet: every variant with examples
- How to verify webhook signatures: Stripe, GitHub, Slack
- Why your regex is slow: catastrophic backtracking explained
- CSV parsing is harder than you think (and why `split(',')` isn't enough)
- NaN, null and undefined in JSON: what serialises to what
- Timezone conversion: the edge cases that bite
- Why 0.1 + 0.2 !== 0.3 (and what to do with money)
- How to generate a strong password (and what entropy means)
- Base64URL vs Base64: when the extra characters matter
- Compound interest explained with 5 worked examples
- OKLCH for designers: why switch from HSL
- PNG vs JPG vs WebP: pick the right image format in 2026
- What is HMAC (and why SHA-256 alone isn't enough)?
- Cron schedule cheatsheet: 50 patterns with explanations
- UUID v4 vs v7: which should you use in 2026?
- Complete regex cheatsheet (with copy-paste patterns that actually work)
- How to convert JSON to YAML (and back) without breaking things
- Cron syntax explained: a no-nonsense guide
- Base64 explained: what it is, what it isn't, and when to use it
- JSON vs XML in 2026: which should you actually use?
- What is a JWT? A practical guide for developers in 2026