The fastest browser-based developer toolbox
Prompt Formatter
Format prompts as Claude XML or ChatGPT and Gemini API JSON
Prompt Sanitizer
Remove emails, phones, API keys and URLs from prompts before sharing
Prompt Variable Replacer
Fill in prompt templates with variables from a CSV — generate multiple prompts at once
LLM Context Window Checker
Estimate tokens and see how your text fits in GPT-4o, Claude, Gemini and more
JSON to TOON
Convert JSON to token-saving TOON and back for LLM prompts
AI Cost Calculator
Estimate API costs for Claude, GPT-4o, Gemini and other LLMs
JWT Reader
Decode and inspect JWT tokens
HTTP Status Codes
Quick reference for HTTP response status codes with descriptions
URL Encoder
Encode and decode URL components
cURL to JS Fetch
Convert a curl command to JavaScript fetch
cURL to Axios
Convert a curl command to an Axios request
cURL to Python
Convert a curl command to Python requests
cURL to PHP
Convert a curl command to PHP cURL
cURL to Go
Convert a curl command to Go net/http
cURL to Ruby
Convert a curl command to Ruby Net::HTTP
cURL to Java
Convert a curl command to Java HttpClient
cURL to C#
Convert a curl command to C# HttpClient
cURL to PowerShell
Convert a curl command to PowerShell Invoke-RestMethod
cURL to Rust
Convert a curl command to Rust reqwest
URL Parser
Break down a URL into protocol, host, path, query params, and hash
URL Query Parser
Parse any URL and extract its query parameters into a readable table
Query Params Builder
Build URLs with query parameters from key-value pairs — copy the encoded result
OpenAPI Viewer
Paste an OpenAPI 3.x JSON or YAML spec and browse endpoints grouped by tag
OpenAPI to TypeScript
Convert OpenAPI component schemas to TypeScript interfaces and types
REST Naming Validator
Validate REST API endpoint paths against naming conventions
JWT Generator
Sign and generate HS256 JSON Web Tokens
Cookie Parser
Parse and inspect cookie header strings into key-value pairs
HTTP Headers Parser
Paste raw HTTP headers and see them formatted as a clean table
Semver Compare
Compare two semantic version strings and identify breaking changes
MIME Lookup
Look up MIME types by file extension or find extensions for a MIME type
IP Parser
Parse IPv4 and IPv6 addresses with binary, private and loopback info
Subnet Calculator
Calculate IPv4 network, broadcast, host range and masks from a CIDR
Color Palette
Generate analogous, triadic and complementary palettes
Color Converter
Convert colors between HEX, RGB, HSL, HSB and CMYK
Color Contrast
Check WCAG AA and AAA contrast ratios between two colors
Color Blind Simulator
Preview how a color looks with different types of color blindness
CSS Gradient
Generate linear and radial CSS gradients with a live preview
Blend Mode Simulator
Preview how two colors interact under Multiply, Screen, Overlay and 13 other blend modes
JSON to TypeScript
Generate TypeScript interfaces from a JSON object
JSON to Zod Schema
Generate Zod validation schemas from a JSON object
JSON to Go Struct
Generate Go structs with json tags from a JSON object
JSON to Java POJO
Generate Jackson-annotated Java POJOs from a JSON object
JSON to C# Class
Generate System.Text.Json C# POCOs from a JSON object
JSON to Kotlin Data Class
Generate kotlinx.serialization data classes from a JSON object
JSON to Rust Struct
Generate serde structs with derive macros from a JSON object
JSON to Swift Codable
Generate Swift Codable structs with CodingKeys from a JSON object
JSON to Python Dataclass
Generate Python dataclasses with type hints from a JSON object
JSON to CSV
Convert a JSON array of objects to CSV format
JSON to Excel
Export a JSON array as a downloadable .xlsx file
CSV to JSON
Convert CSV data to JSON format
CSV to XML
Convert CSV data to XML format
XML to JSON
Convert XML to JSON with @attributes, #text and arrays for repeated tags
JSON to XML
Convert JSON to XML with attributes, a custom root and indentation
CSV to Excel
Export CSV data as a downloadable .xlsx file
Excel to CSV
Extract data from .xlsx files as plain CSV text
Unix Timestamp
Convert between Unix timestamps and human-readable dates
Timezone Converter
Convert a date and time across the world's major timezones
Date Difference
Calculate the exact difference between two dates
Days Until
Calculate how many days until (or since) any date
HTML to Markdown
Convert HTML markup to Markdown syntax
px to rem
Convert CSS pixel values to rem and browse a reference table
List Converter
Convert between newline-separated lists, CSV, and JSON arrays
JSON Sort Keys
Sort JSON object keys alphabetically, recursively
CSV Transpose
Rotate CSV rows and columns — swap headers and records instantly
JSON Formatter
Prettify and minify JSON with indentation control
JSON Validator
Validate JSON and get detailed error messages
Base64
Encode and decode Base64 strings
YAML to JSON
Convert between YAML and JSON formats
XML Formatter
Format and minify XML documents
HTML Entities
Encode and decode HTML entities
Unicode Escape
Escape and unescape Unicode characters
.env Parser
Convert between .env files and JSON key-value pairs
HMAC Generator
Generate HMAC-SHA1, SHA-256 and SHA-512 signatures
AES Encrypt
Encrypt and decrypt text with AES-GCM using a passphrase
Certificate Decoder
Decode X.509 certificates and chains from PEM or DER
GZIP
Compress or decompress text using gzip in the browser
Text to Hex
Encode text to hexadecimal and decode hex back to readable text
Text to Binary
Convert text to binary bits and binary back to readable text
Text to Charcode
Convert text to Unicode character codes (decimal) and back
Base58 Encoder
Encode and decode Base58 strings using the Bitcoin alphabet
UUID Generator
Generate unique identifiers (UUID v4)
Password Generator
Generate strong, random passwords
Hash Generator
Generate SHA-1, SHA-256, SHA-384, SHA-512 hashes
Bcrypt Generator
Hash and verify passwords with bcrypt and an adjustable cost factor
TOTP Generator
Generate and verify TOTP 2FA codes with an otpauth QR code
RSA Key Generator
Generate RSA key pairs as PEM, OpenSSH and JWK
QR Generator
Generate QR codes from any text or URL
Email Signature Generator
Build an HTML email signature for Gmail, Outlook and Apple Mail
Fake Data
Generate realistic fake data for testing
Slug Generator
Convert text to URL-friendly slugs
Password Strength
Analyze password entropy, length, and character variety
Crontab Generator
Build cron expressions from presets or per-field controls
Aspect Ratio Calculator
Calculate canvas dimensions while preserving a specific aspect ratio
FPS Converter
Convert between timecode, frames, seconds and milliseconds at any frame rate
Remove EXIF
Strip EXIF metadata from JPEG images — protect your privacy before sharing
Blur Image
Apply configurable Gaussian blur to images directly in your browser
Image to Base64
Convert images to Base64 data URIs for use in CSS or HTML
SERP Preview
Preview how your page title and meta description appear in Google results
Meta Tags Preview
Generate SEO meta tags: title, description, robots, canonical and more
Open Graph Preview
Generate and preview Open Graph and Twitter Card meta tags
Robots.txt Generator
Build robots.txt files with crawl rules and sitemap references
Schema Generator
Generate JSON-LD structured data for Article, Product, FAQ and more
Regex Tester
Test regular expressions and highlight matches in real time
JSONPath Tester
Run RFC 9535 JSONPath queries on JSON and see each match and path
SQL Formatter
Format and beautify SQL queries with dialect support
Text Diff
Compare two texts and highlight line-by-line differences
JSON Diff
Compare two JSON documents and list every structural difference
Markdown Preview
Live preview with GitHub Flavored Markdown
Markdown to HTML
Convert Markdown to clean HTML markup
Text Case
Convert text between camelCase, snake_case, kebab-case and more
YAML Formatter
Format and validate YAML documents
Text Stats
Count words, characters, lines, sentences, and estimate reading time
Lorem Ipsum
Generate placeholder text by paragraphs, sentences or words
Cron Parser
Translate cron expressions into plain English
Number Base
Convert numbers between binary, octal, decimal and hexadecimal
Chmod Calculator
Calculate Unix file permissions in octal and symbolic notation
Sort Lines
Sort lines alphabetically, numerically, by length, or randomly
Remove Duplicates
Remove duplicate lines from text, case-sensitive or insensitive
HTML to Text
Strip HTML tags and extract clean plain text from markup
Add Line Numbers
Prefix every line in your text with sequential line numbers
Shuffle Lines
Randomly shuffle the order of lines in your text
Word Frequency
Count word occurrences and rank them by frequency
JS Minifier
Minify JavaScript source code
CSS Minifier
Minify and compress CSS stylesheets
JSON Minifier
Minify and prettify JSON documents