54 developer tools
Every tool here is free and needs no account.
JSON Formatter & Beautifier
Format, indent, beautify, and validate JSON data, with the exact position of any syntax error
JSON Validator
Validate JSON syntax against RFC 8259 standards and pinpoint exact line and character errors
JSON Minifier
Remove all unnecessary whitespace, indentations, and newlines to shrink JSON payload size
JSON Beautifier
Re-indent minified JSON at a width you choose, from no indent up to eight spaces
JSON to CSV Converter
Convert JSON object arrays into downloadable CSV spreadsheets with RFC 4180 quoting
CSV to JSON Converter
Convert CSV rows into a structured JSON array of objects, with quoted fields parsed properly
JSON to XML Converter
Convert JSON data structures into hierarchical XML documents
HTML Formatter
Format, indent, and organize messy HTML code with clean tag hierarchy and spacing
HTML Minifier
Remove comments, collapse whitespace, and strip redundant quotes to speed up website page loads
CSS Formatter
Format, indent, and organize CSS stylesheets with uniform selector rules and property spacing
CSS Minifier
Compress CSS stylesheets by removing whitespace, comments, and optimizing hex color values
JavaScript Formatter
Format, de-minify, and beautify minified JS and TypeScript code with customizable indentation
JavaScript Minifier
Minify JavaScript code to reduce bundle size, strip dead comments, and optimize production payloads
SQL Formatter
Format, indent, and uppercase SQL queries for MySQL, PostgreSQL, SQL Server, and Oracle
SQL Minifier
Compress multi-line SQL queries into single-line strings ready for embedding in code and migrations
XML Formatter
Format, indent, and prettify XML documents, RSS feeds, SOAP payloads, and SVG files
XML Validator
Validate XML syntax and check for unclosed tags, attribute errors, and malformed entity references
Base64 Encoder
Encode plain text, passwords, and binary data into safe RFC 4648 Base64 strings
Base64 Decoder
Decode Base64 strings back into readable plain text, JSON, or downloadable binary files
URL Encoder
Encode spaces and special characters into percent-encoded (%20) format for URLs and query strings
URL Decoder
Decode percent-encoded (%20, %26) URL query strings back into human-readable text
HTML Entity Encoder
Escape special characters into HTML entities (<, >, &, ") to prevent XSS vulnerabilities
HTML Entity Decoder
Decode HTML entities (<, >, &, ') back into literal characters and symbols
JWT Decoder
Decode and inspect JSON Web Token (JWT) headers, claims payload, expiration dates, and signatures
JWT Token Generator
Generate test JSON Web Tokens (JWT) with custom claims, expiration dates, and HMAC SHA-256 signatures
UUID / GUID Generator
Generate cryptographically secure Version 4 (random) UUIDs in bulk
GUID Generator
Generate Microsoft GUIDs formatted for C#, SQL Server (uniqueidentifier), and COM registry entries
Hash Generator (MD5, SHA-256, SHA-512)
Calculate SHA-256, SHA-512, SHA-1, and MD5 cryptographic checksums for text simultaneously
MD5 Hash Generator
Generate 128-bit MD5 hex hash digests for legacy checksums, Gravatar URLs, and cache keys
SHA-256 Hash Generator
Calculate secure 256-bit SHA-2 cryptographic hash digests for blockchain, security, and integrity verification
SHA-512 Hash Generator
Calculate high-security 512-bit SHA-2 cryptographic hash digests (128 hex characters)
Strong Password Generator
Generate cryptographically strong, uncrackable passwords with customizable length and symbol rules
API Key Generator
Generate production-ready API keys (sk_live_..., omni_...), bearer tokens, and webhook secrets
Regex Tester
Test, evaluate, and debug regular expressions in real-time with capture groups and syntax highlighting
QR Code Generator
Encode a URL, Wi-Fi network, contact card or plain text as a QR code, with PNG and SVG output
Barcode Generator
Generate CODE128, EAN-13, EAN-8, UPC-A, CODE39 and ITF-14 barcodes with verified check digits
TTFB Checker
Measure Time to First Byte, DNS handshake, server response time, and edge CDN cache hit status
Render-Blocking Resource Detector
Identify parser-blocking scripts and stylesheets in head tags and generate non-blocking async/defer code
HTTP Compression & Gzip Checker
Verify whether your server serves Brotli or Gzip compressed assets and calculate potential byte savings
DOM Size Checker
Audit total HTML DOM nodes, maximum nesting depth, and excessive child elements against Lighthouse standards
HTTP Security Headers Checker
Audit CSP, HSTS, X-Content-Type-Options, X-Frame-Options, Referrer-Policy, and cache headers
Website Resource Budget Calculator
Calculate permissible page weight budgets for 3G/4G/5G connections and generate Lighthouse budget.json
Chmod Calculator & Permissions Generator
Calculate Unix/Linux file permissions, octal codes (755, 644), and symbolic flags
Online HTML / CSS / JS Compiler & Runner
CodeChef-inspired online HTML editor with live sandboxed preview, multi-tab files, and instant execution
Unix Timestamp / Epoch Converter
Convert Unix epoch timestamps to human-readable dates and reverse dates into seconds or milliseconds
YAML to JSON Converter
Convert YAML configuration files into valid, indented JSON with structural schema validation
JSON to YAML Converter
Convert JSON data into clean, readable YAML configuration syntax with custom indentation
Cron Expression Generator & Explainer
Build crontab schedule expressions visually and translate complex cron syntax into plain English
CSS Box Shadow Generator
Visually design smooth CSS box shadows with interactive blur, spread, offset, and inset controls
CSS Gradient Generator
Create vibrant linear, radial, and conic CSS gradients with live visual preview and color stops
CSS Glassmorphism Generator
Design frosted glass UI elements with adjustable backdrop-filter blur, transparency, and borders
cURL to Code Converter (Fetch, Axios, Python)
Convert cURL terminal commands into clean JavaScript Fetch, Axios, Python Requests, PHP, and Go
IPv4 Subnet Calculator & CIDR Range Tool
Calculate IPv4 network ranges, subnet masks, usable hosts, and broadcast addresses from CIDR notation
HTML to JSX Converter
Transform HTML markup into clean, valid React JSX with automatic attribute and style conversions