Developer Tools

Encode text to Base64 or decode Base64 to text instantly

Encode or decode URLs and query string parameters

Decode and inspect JSON Web Tokens (JWT) header and payload

Encode special characters to HTML entities or decode them back

Format, validate, and minify JSON data with syntax highlighting

Minify CSS code to reduce file size for production

Minify JavaScript code to reduce file size for production

Format and beautify SQL queries with proper indentation

Minify JSON by removing all whitespace with size comparison

Beautify and minify HTML with configurable indentation and syntax highlighting

Generate random UUIDs (v4) in bulk with one click

Generate placeholder text in paragraphs, sentences, or words

Generate strong, random passwords with customizable length and character sets

Build or parse cron expressions with human-readable descriptions and next run times

Generate favicons from text, emoji, or image in all required sizes

Generate realistic fake data in JSON, CSV, or SQL format with customizable schemas

Generate QR codes from text, URLs, WiFi credentials, vCards, email, and phone numbers with customizable colors and sizes

Generate customizable SVG placeholder images with text

Generate random MAC addresses with format options

Generate QR codes for WiFi network credentials

Convert between Unix timestamps and human-readable dates

Convert colors between HEX, RGB, HSL, and HSB formats

Convert between YAML and JSON formats instantly

Convert numbers between binary, octal, decimal, and hexadecimal

Convert JSON to TypeScript interfaces or Zod validation schemas

Parse, validate, and convert TOML to JSON, YAML, or vice versa

Convert Docker Compose files to Kubernetes Deployments, Services, and ConfigMaps

Convert between JSON arrays and CSV with nested object flattening

Translate SQL queries to MongoDB and vice versa with syntax highlighting

Format and validate Terraform HCL code with diff preview

Convert images to Base64 data URIs or decode Base64 strings back to images. Supports JPG, PNG, GIF, WebP, SVG, ICO.

Convert curl commands to code in JavaScript fetch, Axios, Python requests, Go, PHP, and Ruby

Convert between HTML and Markdown instantly with live preview

Convert text to binary representation and back

Convert text to NATO phonetic alphabet (Alpha, Bravo, Charlie...)

Convert between decimal numbers and Roman numerals

Convert between Celsius, Fahrenheit, and Kelvin

Convert HTML to React JSX — class to className, style strings to objects, SVG attributes

Convert JSON arrays to JSON Lines format and back

Convert between Bytes, KB, MB, GB, TB, PB with decimal and binary units

Convert between XML and JSON formats with attribute handling

Test regular expressions against text with real-time match highlighting

Write Markdown and see a live rendered preview side by side

Compare two texts and find differences with side-by-side or unified view

Convert text between camelCase, snake_case, UPPER, lower, Title, and more

Count words, characters, sentences, and paragraphs in your text

Browse ASCII/Unicode tables, search characters, and look up code points

Write Mermaid diagrams with syntax highlighting, templates, and live preview

Interactive HTTP status code reference with descriptions, causes, and examples

Convert text to URL-friendly slugs with customizable separators

Search and copy emojis with categories and unicode info

Convert text to ASCII art with multiple font styles

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text

Generate Subresource Integrity hashes for scripts and stylesheets

Build and sign JSON Web Tokens with custom claims. Supports HS256, HS384, HS512 with live preview and decoding.

Analyze password strength with entropy, crack time, and suggestions

Generate RSA 2048/4096 key pairs using Web Crypto API

Hash passwords with bcrypt/PBKDF2 and verify hashes

Decode and inspect PEM-encoded SSL/TLS certificates and CSRs

Estimate token counts and API costs for GPT-4o, Claude, Gemini, and more

Compare AI models side-by-side — pricing, context windows, capabilities, and cost calculator

Build structured prompts with variables, roles, and export to OpenAI/Anthropic API format

Generate OpenAI/Anthropic/Gemini function calling schemas from JSON

Analyze AI system prompts for cost, structure, injection risks, and best practices

Validate AI model JSON output against a JSON Schema with detailed error paths

Clean text data for ML training with toggleable operations

Encode categorical labels to integers or one-hot vectors

Calculate storage, memory, and fine-tuning costs for AI datasets

Visualize 2D embeddings as interactive scatter plots

Build confusion matrices with accuracy, precision, recall, and F1

Detect outliers using IQR, Z-score, and Modified Z-score methods

Normalize data with Min-Max, Z-score, or Robust scaling

Structure AI prompts with templates, roles, and format options

Generate a comprehensive, customizable privacy policy for your website or app

Generate robots.txt files with visual controls to block AI crawlers and bots

Build Content Security Policy headers with an interactive visual editor

Generate GDPR data access, deletion, and portability request letters in EN/DE

Build CORS headers with output for Express, nginx, Apache, Next.js, and more

Grade security headers A+ to F with OWASP recommendations

Preview how your page looks in Google, Twitter, Facebook, LinkedIn, Slack, and Discord

Generate valid XML sitemaps with per-URL lastmod, changefreq, and priority

Audit and optimize HTML head tags for SEO and best practices

Calculate and compare CSS selector specificity with visual breakdown

Visual CSS keyframe animation builder with live preview and code export

Convert between Tailwind CSS classes and regular CSS with responsive/state support

View, optimize, and convert SVG to React components with size comparison

Visual gradient builder with linear, radial, and conic gradients plus CSS output

Simulate how colors appear under different types of color vision deficiency

Visual CSS box-shadow editor with multiple layers, live preview, and code output

Convert between px, rem, em, vw, vh, pt, cm, mm, in, and pc

Generate color palettes — complementary, analogous, triadic, and more

Generate shades, tints, and tones from any base color

Check WCAG AA/AAA color contrast ratios for accessibility

Visual responsive navbar builder with HTML and Tailwind export

Visual multi-column footer builder with HTML and Tailwind export

Parse, edit, diff, and export .env files with duplicate detection

Parse, edit, sort, filter CSV data and export as JSON, TSV, or Markdown

Test semver ranges, compare versions, and explore version range syntax

Interactive git command constructor with 40+ operations and explanations

Generate .gitignore files for any language, framework, or IDE

Build professional README.md files with badges, sections, and templates

Validate GitHub Actions workflow YAML with error detection and best practices

Lint Dockerfiles for best practices, security issues, and optimization tips

Validate and visualize OpenAPI/Swagger specs with endpoint cards and schema browser

Generate changelogs from git commits using conventional commit format

Analyze package.json for issues, typosquatting risks, and dependency insights

Infer JSON Schema from data or validate JSON against a schema with detailed error reports

Calculate network address, broadcast, subnet mask, wildcard, and usable host range from any IPv4 CIDR notation.

Interactive Unix file permission calculator with octal and symbolic notation

Browser-based HTML, CSS & JavaScript editor with live preview and console

Normalize email addresses — remove dots, plus-tags, and vendor quirks

Stopwatch with lap tracking, split times, and millisecond precision

Generate random IPv6 Unique Local Addresses (fd00::/8)

Convert IP ranges to CIDR notation and calculate total IPs

Calculate estimated time remaining for long-running tasks

Convert docker run commands to docker-compose.yml

Parse and analyze browser user agent strings

Test JSONPath expressions against JSON data with result highlighting

Search MIME types by extension or type name — 200+ types

Calculate AND, OR, XOR, NOT, and shifts with visual bit representation

Preview HTML email templates with desktop/mobile viewports and dark mode

Visualize CPU scheduling algorithms: FCFS, SJF, SRTF, Round Robin, Priority

Convert memory addresses between hex, decimal, and binary with pointer arithmetic

Parse and analyze raw HTTP headers with descriptions

Calculate CRC-8, CRC-16, and CRC-32 checksums with multiple presets

Validate Ethereum, Bitcoin, and Solana wallet addresses

Calculate Ethereum gas fees in Gwei, ETH, and USD

Encode and decode Ethereum smart contract ABI calls

Calculate Keccak-256 hashes and Solidity function selectors

Encode and decode Base58 and Base58Check (Bitcoin format)

Convert between wei, gwei, and ether with custom decimals

Build Merkle trees, generate and verify proofs

Convert between block numbers and timestamps for EVM chains

Disassemble EVM bytecode into human-readable opcodes

EIP-55 checksum conversion, validation, and vanity analysis

Complete Git command reference — from basics to advanced workflows. Searchable, with examples.

Complete Vim/Vi command reference — modes, motions, editing, search, and advanced features.

Complete Docker & Docker Compose command reference — containers, images, volumes, networks, and orchestration.

Complete regular expression reference — syntax, patterns, quantifiers, groups, lookaheads, and common recipes.

Complete Linux/Bash command reference — file management, text processing, networking, system admin, and shell scripting.

Complete Kubernetes & kubectl command reference — pods, deployments, services, configmaps, and cluster management.

Complete Python reference — syntax, data structures, string methods, file I/O, comprehensions, and common patterns.

Complete SQL reference — queries, joins, aggregation, subqueries, indexes, and database management.

Complete Nginx configuration reference — server blocks, locations, proxying, SSL, load balancing, and caching.

Complete SSH reference — connections, key management, tunneling, config, SCP/SFTP, and security hardening.

Complete Jenkins reference — pipeline syntax, Jenkinsfile, plugins, CLI, agents, and CI/CD patterns.

Complete HTTP headers reference — request headers, response headers, caching, security, CORS, and content negotiation. Searchable, with examples.

Comprehensive PostgreSQL reference — from connection basics to advanced features like JSONB, full-text search, window functions, and performance tuning.

Multi-language async/concurrency patterns — JavaScript, Python, Go, Rust, Java, and universal concurrency patterns.

Comprehensive reference for Protocol Buffers (proto3) and gRPC — message definitions, services, streaming, and common patterns.

Complete JavaScript Array methods reference — creating, searching, transforming, sorting, iterating, and common patterns. Searchable, with examples.

Complete Tailwind CSS reference — layout, spacing, typography, colors, responsive design, states, and common patterns. Searchable, with examples.

Complete GraphQL reference — schema definition, types, queries, mutations, directives, fragments, and common patterns. Searchable, with examples.

Complete VS Code keyboard shortcuts — editing, navigation, search, multi-cursor, terminal, debug, and more. Searchable, with Cmd/Ctrl notation.

Complete CSS Grid reference — container properties, item placement, grid functions, and common layout patterns. Searchable, with examples.

Complete CSS Flexbox reference — container properties, item properties, and common layout patterns. Searchable, with examples.

Complete React Hooks reference — useState, useEffect, useContext, custom hooks, and common patterns. Searchable, with examples.

Complete TypeScript reference — types, interfaces, generics, utility types, and advanced patterns. Searchable, with examples.

Complete AWS CLI reference — EC2, S3, IAM, Lambda, ECS, RDS, CloudFormation, and common operations.

Complete Go (Golang) reference — syntax, types, functions, concurrency, error handling, and common patterns.

Complete PowerShell reference — cmdlets, pipelines, scripting, file operations, remote management, and Active Directory.

Complete Redis command reference — strings, hashes, lists, sets, sorted sets, pub/sub, transactions, and server management.

Complete Terraform reference — init, plan, apply, state management, modules, workspaces, and HCL syntax.

Complete Ansible reference — playbooks, modules, inventory, roles, vault, and ad-hoc commands.

Complete JavaScript reference — variables, types, operators, strings, arrays, objects, functions, async, DOM, ES6+, and more.

Complete CSS reference — selectors, box model, positioning, typography, animations, media queries, custom properties, and more.

Complete HTML reference — document structure, text content, forms, media, semantic elements, accessibility, and more.

Complete Java reference — data types, strings, collections, OOP, interfaces, exceptions, file I/O, streams, lambdas, and more.

Complete Bash reference — variables, strings, arrays, conditionals, loops, functions, file tests, I/O redirection, process management, and more.

Comprehensive Rust language cheat sheet covering ownership, traits, pattern matching, concurrency, and more.

Complete Markdown syntax reference for headings, formatting, links, tables, code blocks, and extensions.

YAML syntax reference covering scalars, collections, anchors, multi-line strings, and common patterns.

Curl command-line reference for HTTP requests, authentication, file transfers, debugging, and common API patterns.

Cron scheduling reference covering syntax, field values, crontab management, and common schedule patterns.

Terminal multiplexer for managing multiple sessions, windows, and panes from a single terminal.

Powerful text processing language for pattern scanning, data extraction, and report generation.

Stream editor for filtering and transforming text, line by line.

Search for files and directories in a directory hierarchy with powerful filtering options.

Search text using patterns. Filter lines from files, command output, or streams with regular expressions.

Complete PHP cheat sheet covering syntax, OOP, arrays, PDO, and modern PHP 8.x features.

Complete C programming cheat sheet covering syntax, pointers, memory management, and standard library.

Complete C++ cheat sheet covering STL containers, OOP, templates, smart pointers, and modern C++ features.

Complete MySQL cheat sheet covering queries, joins, indexes, transactions, and administration.

Complete Sass/SCSS cheat sheet covering variables, mixins, functions, nesting, and modern module system.

Linux file permission commands and patterns for chmod.

Essential NumPy commands for array manipulation and numerical computing in Python.

Pandas cheat sheet for data manipulation, analysis, and transformation in Python.

Dart language cheat sheet covering syntax, types, OOP, null safety, and async patterns.

Laravel PHP framework cheat sheet for routing, Eloquent, Blade, Artisan, and more.

Comprehensive Node.js runtime reference covering modules, file system, HTTP, streams, and more.

Next.js App Router reference covering routing, data fetching, server components, and deployment.

MongoDB reference covering CRUD operations, aggregation, indexes, and administration.

Firebase reference covering Authentication, Firestore, Realtime Database, Cloud Functions, and Hosting.

Docker Compose reference covering CLI commands, service configuration, networking, volumes, and more.

Quick reference for jQuery selectors, DOM manipulation, events, AJAX, and more.

Quick reference for LaTeX document structure, math mode, formatting, and common packages.

Quick reference for XPath expressions, axes, predicates, and functions for XML/HTML querying.

Quick reference for Emmet abbreviations for lightning-fast HTML and CSS coding.

Quick reference for TOML configuration file syntax, types, tables, and common patterns.

Complete Prisma ORM cheat sheet — schema, queries, migrations, and CLI.

Complete GitHub Actions cheat sheet — workflows, triggers, jobs, and CI/CD patterns.

Complete npm cheat sheet — package management, scripts, publishing, and configuration.

Complete Supabase cheat sheet — auth, database, realtime, storage, and edge functions.

Complete Apache HTTP Server cheat sheet — virtual hosts, modules, rewrite rules, and SSL.

Complete reference of all standard HTTP response status codes with descriptions and use cases.

Complete ASCII character reference with decimal, hexadecimal, and character values.

Essential Chrome DevTools shortcuts, commands, and workflows for web developers.

Complete Drizzle ORM reference for schema definition, queries, relations, migrations, and common patterns.

Complete Vercel CLI reference for deployment, project management, domains, environment variables, and configuration.

Production process manager for Node.js applications with built-in load balancer, monitoring, and zero-downtime reloads.

GNU Screen terminal multiplexer for persistent sessions, window management, and remote work.

Module bundler for JavaScript applications — loaders, plugins, code splitting, optimization, and dev server.

Next-generation frontend build tool with instant HMR, native ES modules, and optimized production builds via Rollup.