50 Best Developer Tools
Formatters, Encoders, Validators, Converters, Security & Cryptography Utilities for Engineers
JSON Formatter & Validator
Prettify, format, validate, and minify JSON strings with real-time error syntax highlighting.
Base64 Encoder & Decoder
Instantly encode plain text to Base64 or decode Base64 back to readable UTF-8 strings.
JWT Token Decoder & Inspector
Decode and inspect JSON Web Token (JWT) headers, claims, payload JSON, and expiration dates.
Regex Tester & Matcher
Test regular expressions against sample text with live capture groups, flags, and match highlights.
UUID / GUID Generator (v4 & v7)
Generate cryptographically random UUID v4 and timestamp-ordered UUID v7 strings in bulk.
URL Encoder & Decoder
Percent-encode and decode URLs and URI query parameters compliant with RFC 3986.
HTML Entity Encoder & Decoder
Convert special characters into HTML entities (&, <, >) and decode entities to characters.
MD5, SHA-256 & Hash Generator
Calculate cryptographic checksums: MD5, SHA-1, SHA-256, and SHA-512 hashes.
SQL Query Formatter & Beautifier
Format, indent, and uppercase keywords in MySQL, PostgreSQL, and SQLite queries.
CSS Minifier & Formatter
Compress CSS files to save bandwidth or unminify compressed CSS for editing.
JavaScript Formatter & Beautifier
Format and beautify obfuscated or compressed JavaScript code blocks.
Markdown to HTML Live Previewer
Write Markdown copy with live real-time HTML preview and one-click HTML copy.
Slug & URL Permalink Generator
Convert article titles and strings into SEO-friendly, clean URL slugs with custom delimiters.
HEX, RGB, HSL & CMYK Color Converter
Convert color values between HEX, RGB, RGBA, HSL, HSLA, and CMYK with color previews.
Lorem Ipsum Dummy Text Generator
Generate custom paragraphs, sentences, or word counts of Latin dummy placeholder text.
Unix Timestamp & Date Converter
Convert Unix epoch timestamps (seconds/milliseconds) to human-readable dates and vice-versa.
Text & Code Diff Comparison Tool
Compare two text blocks side-by-side or inline to highlight additions, deletions, and diffs.
Secure Password & Token Generator
Generate strong, cryptographically secure passwords and API tokens with entropy metrics.
Bcrypt Hash Generator & Verifier
Generate and verify standard 60-character Bcrypt ($2y$) password hashes.
Cron Expression Parser & Visualizer
Parse 5-field cron syntax into human-readable schedules with next execution dates.
HTML to Markdown Converter
Convert raw HTML markup, tables, and links back into clean GitHub Markdown.
XML Formatter & Syntax Validator
Format and validate XML documents, sitemaps, and SOAP payloads with tree indentation.
YAML to JSON & JSON to YAML Converter
Convert configuration files seamlessly between YAML and JSON formats.
Number Base Converter (Binary, Octal, Hex, Dec)
Convert numbers across Binary (Base 2), Octal (Base 8), Decimal (Base 10), and Hex (Base 16).
HTTP Status Code Lookup & Guide
Interactive lookup and technical explanation of 1xx, 2xx, 3xx, 4xx, and 5xx HTTP response codes.
cURL Command to Code Converter
Convert raw cURL requests into PHP (Guzzle/cURL), JavaScript (Fetch/Axios), and Python.
User Agent String Inspector
Parse User-Agent strings to extract browser version, OS, rendering engine, and device type.
String Case Converter (Camel, Snake, Kebab)
Convert text and variable names between camelCase, snake_case, kebab-case, PascalCase, and CONSTANT_CASE.
Word, Character & Byte Counter
Real-time word counter, character count (with/without spaces), paragraphs, bytes, and reading time.
IP Subnet & CIDR Calculator
Calculate IP address ranges, subnet masks, broadcast IPs, and total usable hosts from CIDR notation.
QR Code Generator
Generate high-resolution SVG and PNG QR codes for URLs, WiFi credentials, and plain text.
CSS Box Shadow Visual Designer
Visually design multilayer CSS box-shadows and copy production-ready CSS code.
CSS Gradient Palette Builder
Create smooth linear and radial CSS gradients with multiple color stops and angle controls.
HTML Meta Tag & OpenGraph Generator
Generate complete SEO meta tags, OpenGraph (Facebook/LinkedIn), and Twitter Card markup.
HTML Table to Markdown & JSON Converter
Parse raw HTML `<table>` elements and transform them into Markdown tables and JSON arrays.
SVG Code Minifier & Optimizer
Clean redundant XML namespaces, metadata, and minify SVG vector markup.
CSS Flexbox Visual Playground
Interactive CSS flexbox visualizer with justify-content, align-items, and direction controls.
JavaScript Keycode & Event Inspector
Press any key to inspect `event.key`, `event.code`, numeric `keyCode`, and modifier states.
Duplicate Line Remover & List Sorter
Remove duplicate lines from text lists, sort alphabetically, reverse, and trim whitespace.
Chmod & Linux Permissions Calculator
Calculate numeric (777, 755, 644) and symbolic (`rwxr-xr-x`) file permissions with checkboxes.
BEM & CSS Class Formatter
Format and validate Block Element Modifier (BEM) naming conventions for CSS architecture.
JSON Schema Validator & Generator
Generate JSON Schema draft definitions from raw sample JSON and validate data compliance.
Hex to ASCII & ASCII to Hex Converter
Convert raw ASCII character text to hexadecimal byte representations and vice-versa.
Robots.txt & Sitemap Syntax Checker
Validate search crawler directives in robots.txt and XML sitemap hierarchy syntax.
JavaScript & PHP String Obfuscator
Obfuscate sensitive strings into character arrays and hex encoding for safe embedding.
HTML Favicon Code & Header Generator
Generate complete multi-resolution favicon HTML tags for Apple Touch, Android, and desktop browsers.
URL Parser & Query Parameter Extractor
Deconstruct complex URLs into protocol, host, port, path, and extract query string keys/values.
CSS Unit Converter (px to rem, em, %, vh, vw)
Convert pixel (px) values to modern scalable units (rem, em, percentage, viewport units).
PHP Array to JSON & JSON to PHP Converter
Convert between PHP associative array syntax (`["key" => "val"]`) and JSON objects.
Docker Compose to .env Extractor
Parse docker-compose.yml files and extract all declared environment variables into a `.env` template.