Developer Tools
JSON formatter, Base64, UUID, hash generator, regex tester, and more.
JSON Formatter
Format, validate, and minify JSON data with syntax highlighting
Base64 Encoder/Decoder
Encode and decode Base64 strings
UUID Generator
Generate and validate UUIDs (v4)
Regex Tester
Test regular expressions with real-time matching
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes
Curl Converter
Convert curl commands to Python, JavaScript, Go, PHP, and 10+ languages
Markdown Preview
Write Markdown and see real-time HTML preview
URL Encoder/Decoder
Encode and decode URLs and query strings
HTML Encoder/Decoder
Encode and decode HTML entities
JWT Decoder
Decode and inspect JSON Web Tokens without verification
Cron Expression Parser
Parse and validate cron expressions, see next run times, and explain field meanings
Diff Checker
Compare two texts and highlight the differences line by line
SQL Formatter
Format and beautify SQL queries
CSS Minifier / Beautifier
Minify or beautify CSS code to reduce file size or improve readability
HTML Minifier
Minify or beautify HTML code to reduce file size
JavaScript Minifier
Minify or beautify JavaScript code to reduce file size
YAML / JSON Converter
Convert between YAML and JSON formats
XML / JSON Converter
Convert between XML and JSON formats
IP Subnet Calculator
Calculate subnet details including network address, broadcast, and host range
HTTP Status Codes
Browse and search all HTTP status codes with descriptions
Unix Permissions Calculator
Convert Unix file permissions between numeric (octal) and symbolic notation, with chmod command builder
Fake Data Generator
Generate realistic fake data for testing: names, emails, addresses, and more
JSONPath Tester
Test JSONPath expressions against JSON data
JSON Schema Validator
Validate JSON data against a JSON Schema
JSON to TypeScript
Generate TypeScript interfaces from JSON data
User Agent Parser
Parse user agent strings to extract browser, OS, device info
MIME Type Lookup
Search MIME types by file extension or content type
ASCII Table
Interactive ASCII character reference table (0-127)
Meta Tag Generator
Generate HTML meta tags for SEO and social media
Robots.txt Generator
Generate robots.txt with user-agent rules and sitemap
Sitemap Generator
Generate sitemap.xml from a list of URLs
TOML ↔ JSON Converter
Convert between TOML and JSON formats
SVG Optimizer
Optimize and clean SVG code
CSS Unit Converter
Convert between CSS units: px, rem, em, %, vw, vh, pt
API Request Builder
Build HTTP requests and generate code for cURL, fetch, axios
Code Screenshot
Convert code to beautiful image using Canvas
JSON to PHP Array
Convert JSON data to PHP array syntax code
Properties / JSON Converter
Convert between Java .properties files and JSON format
JSON / SQL Converter
Convert between JSON arrays and SQL INSERT statements
YAML / TOML Converter
Convert between YAML and TOML configuration formats
JSON to HTML Table
Convert JSON array data to HTML table code
CSV to SQL
Convert CSV data to SQL CREATE TABLE and INSERT statements
Token Counter (LLM)
Count tokens for GPT, Claude, and Gemini prompts. Exact via tiktoken for OpenAI models, approximation for Claude/Gemini.
OpenAPI / Swagger Viewer
Paste an OpenAPI 3 or Swagger 2 spec (YAML or JSON), browse endpoints, parameters, and schemas. All client-side, no upload.