175+ Free Online Developer Tools
Json ↔ Yaml Converter
Convert Json data to Yaml and vice versa
Number Base Converter
Convert numbers from one base to another
CSV to JSON Converter
Convert CSV data to JSON format
JSON to CSV Converter
Convert JSON array data to CSV format
JSON to XML Converter
Convert JSON data to XML format
XML to JSON Converter
Convert XML data to JSON format
YAML to JSON Converter
Convert YAML data to JSON format
Unit Converter
Convert between different units of measurement
Unix Permissions Calculator
Calculate Unix file permissions with visual checkboxes, octal, and symbolic notation
Date/Time Converter
Convert between different date and time formats
cURL Converter
Convert cURL commands to various formats
Docker to Compose
Convert docker run commands to docker-compose.yml
CBOR / MessagePack Codec
Encode JSON to CBOR or MessagePack binary and decode
Coordinates Converter
Convert coordinates between DD, DMS, and UTM formats
Cron Expression Parser
Parse Cron expressions to get scheduled execution dates
Data Size / Byte Converter
Convert between data size units
HTML to JSX Converter
Convert HTML markup to React JSX syntax
JSON Table Viewer
Visualize JSON arrays as sortable interactive tables
JSON to Code Generator
Generate types and classes in multiple languages from JSON
JSON Array to Table
Convert JSON arrays to table format with CSV/TSV export
JSON ↔ TOML Converter
Convert between JSON and TOML formats
Markdown ↔ HTML Converter
Convert between Markdown and HTML formats
NATO Phonetic Alphabet Converter
Convert text to NATO phonetic alphabet
OPML RSS URL Extractor
Extract RSS feed URLs from OPML files
Protobuf Decoder / Encoder
Decode/encode Protocol Buffer messages without schema definitions
Roman Numeral Converter
Convert between Roman numerals and Arabic numbers
RSS URLs to OPML Generator
Generate OPML files from RSS feed URLs
Swap Endianness
Swap between little-endian and big-endian byte order
Text to Binary Converter
Convert between text and binary with configurable grouping
VarInt Encoder / Decoder
Encode unsigned integers to Protobuf-style LEB128 VarInt and decode
YAML ↔ TOML Converter
Convert between YAML and TOML formats
Base64 Encoder / Decoder
Encode and decode Base64 text data
JWT Decoder
Decode a JWT header, payload and signature
URL Encoder / Decoder
Encode or decode URL entity characters
HTML Entity Encoder / Decoder
Encode and decode HTML entities
Unicode Converter
Convert characters to Unicode code points and vice versa
String Obfuscator
Obfuscate strings using various encodings
Base64 Image Encoder / Decoder
Encode and decode Base64 image data
Certificate Decoder
Decode SSL/TLS certificates
GZip Compress / Decompress
Compress or decompress text with GZip
Quoted-Printable Codec
Encode or decode text using quoted-printable format (RFC 2045)
Hex to ASCII Converter
Convert between hexadecimal and ASCII text formats
Base58 Encoder / Decoder
Encode and decode text using Base58 encoding
GZip Processor
High-performance GZip compression
Base32 Encoder / Decoder
Encode and decode Base32 strings
Bzip2 Decompressor
Decompress bzip2 files and encoded data
Base62 Encoder / Decoder
Encode and decode Base62 strings
JSON Formatter
Indent or minify JSON data
SQL Formatter
Format and beautify SQL queries for better readability
Code Beautifier
Beautify and format code in multiple languages
JSON Schema Generator
Generate JSON Schema from sample JSON data automatically
JSON to TypeScript
Generate TypeScript interfaces and types from JSON data
CSS Formatter
Format and prettify CSS code
GraphQL Formatter
Format and prettify GraphQL queries, mutations, and schemas
HTML Formatter
Format and prettify HTML code
JavaScript Formatter
Format and prettify JavaScript code
LESS Formatter
Format and prettify LESS stylesheets
Python Formatter
Format and prettify Python code with proper indentation
SCSS Formatter
Format and prettify SCSS/Sass code
TOML Formatter
Format and prettify TOML configuration files
XML Formatter
Indent or minify XML data
YAML Formatter
Format and prettify YAML configuration files
Hash Generator
Calculate MD5, SHA1, SHA256 and SHA512 hash from text data
UUID Generator
Generate UUIDs version 1 and 4
Password Generator
Generate secure random passwords
Lorem Ipsum Generator
Generate Lorem Ipsum placeholder text
QR Code Generator
Generate QR codes from text
HMAC Generator
Generate HMAC signatures for API authentication and webhooks
Bcrypt Generator / Validator
Generate and validate bcrypt password hashes
Fake Data Generator
Generate fake data for testing
Basic Auth Generator
Generate HTTP Basic Authentication credentials
Hash Calculator
Calculate hash values using native crypto algorithms
Meta Tag Generator
Generate Open Graph and Twitter Card meta tags
MAC Address Generator
Generate random MAC addresses
Scrypt Hash Generator
Generate scrypt password hashes
SVG Placeholder Generator
Generate SVG placeholder images
Random Number Generator
Generate cryptographically secure random numbers
Random Port Generator
Generate random TCP/UDP port numbers
CSS Triangle Generator
Generate CSS triangles in 8 directions
ASCII Art Text Generator
Convert text to ASCII art using FIGlet fonts
Open Graph Generator
Generate Open Graph meta tags for social media sharing
OTP Generator (TOTP/HOTP)
Generate time-based and counter-based one-time passwords
Random Data Generator
Generate random data for testing
RSA Key Pair Generator
Generate RSA public/private key pairs in PEM format
WiFi QR Code Generator
Generate QR codes for WiFi network credentials
Text Comparer
Compare two texts and highlight differences
Text Inspector
Inspect text statistics and properties
Markdown Preview
Write and preview Markdown with live rendering
Regex Tester
Test and debug regular expressions with real-time matching
Character Counter
Count characters, words, and lines in text
Text Case Converter
Convert text between various case formats
Text Statistics
Analyze text statistics and readability
URL Slug Generator
Convert text to URL-friendly slugs
ASCII Art Text Generator
Convert text to ASCII art using FIGlet fonts
CSS Playground
Real-time HTML + CSS sandbox with instant preview
Defang / Fang URLs & IPs
Defang and refang URLs and IP addresses for safe sharing
Emoji Picker & Search
Browse, search, and copy Unicode emojis by keyword or category
Extract URLs / Emails / IPs
Extract all URLs, email addresses, and IP addresses from text
HTML Preview
Preview HTML code in a real-time browser preview
Line Utilities
Sort lines, remove whitespace, filter text lines
List Comparer
Compare two lists and find differences
Mermaid Diagram Editor
Write Mermaid diagram syntax and preview diagrams in real-time
String Obfuscator / PII Masker
Mask emails, credit cards, phone numbers, IPs, and JWTs in text
Prefix / Suffix Lines
Add prefix or suffix to each line of text
Outlook Safelink Decoder
Decode Outlook ATP and Proofpoint safe link wrappers
String Replacer
Find and replace text using regular expressions
Strip HTML Tags
Remove all HTML tags, extract plain text, and decode entities
SVG Preview / Editor
Edit SVG markup and view rendering in real-time
Text Escape / Unescape
Escape or unescape special characters in strings
Favicon Generator
Generate favicon from image
Image to Base64
Convert images to Base64 encoded strings
Image Compressor
Compress PNG and JPEG images to reduce file size
Image Cropper
Crop images by selecting a rectangular area
Code Screenshot
Create beautiful screenshots of your code
SVG to PNG Converter
Convert SVG files to PNG format
Image Boxing
Fit images to canvas with letterbox/pillarbox padding
Image Compare Slider
Compare two images side by side with a draggable slider
Image Converter
Lossless image format converter
Image Processor
High-performance image processing with AVIF/HEIF support
Image Resizer
Resize images by dimensions or percentage
SVG Optimizer (SVGO)
Optimize SVG files using SVGO in the browser
IP Address Lookup
Look up detailed information about any IP address including geolocation, ISP, ASN, timezone
CIDR Calculator
Calculate subnet masks, IP ranges, and network details from CIDR notation
User Agent Parser
Parse and analyze user agent strings to detect browser, OS, device type
Device Information
Detect and display your browser and device information
URL Parser
Parse and analyze URL strings to extract protocol, hostname, path, query parameters
API Tester
Test REST API endpoints with various HTTP methods
IPv4 Address Converter
Convert IPv4 addresses between decimal, hex, and binary formats
IPv4 Range Expander
Expand IPv4 ranges into address lists with count
IPv6 Parser / Expander
Parse, compress, and expand IPv6 addresses
IPv6 ULA Generator
Generate RFC 4193 IPv6 Unique Local Addresses
MAC Address Vendor Lookup
Look up MAC address manufacturer
TLS Version Checker
Check TLS/SSL version, certificate details, and cipher suites
AES Encryptor
Encrypt and decrypt text using AES algorithm
Bcrypt Generator
Generate bcrypt password hashes for secure storage
HMAC Generator
Generate HMAC message authentication codes
BIP39 Mnemonic Generator
Generate BIP39 mnemonic phrases for crypto wallets
Color Converter
Convert colors between HEX, RGB, HSL and other formats
Color Contrast Checker
Calculate color contrast ratios and check WCAG accessibility
Color Palette Generator
Generate harmonious color palettes
Color Blindness Simulator
Simulate color blindness effects on images for accessibility testing
Color Harmonies Generator
Generate complementary, analogous, triadic, tetradic harmonies
Color Palette Extractor
Extract dominant colors from images (HEX, RGB, HSL)
Color Palette Generator
Generate harmonious color schemes
Tints & Shades Generator
Generate lighter tints and darker shades from any base color
Timestamp Converter
Convert between Unix timestamps and human-readable dates
Math Evaluator
Evaluate mathematical expressions with variables and functions
Checksum Calculator
Calculate CRC checksums and validate Luhn numbers
Entropy Calculator
Calculate Shannon entropy and character frequency distribution
Percentage Calculator
Calculate percentages, percentage changes, and percentage of values
Cron Expression Parser
Parse and analyze Cron expressions
HTTP Status Codes
Reference for HTTP status codes and their meanings
MIME Types Reference
Lookup MIME types by extension or type name
Git Command Reference
Quick reference for common Git commands
CSS Cursors Reference
Browse all 36 native CSS cursor values with hover previews
Regex Cheatsheet
8-category regular expression reference with examples
CSS to Tailwind
Convert CSS styles to Tailwind CSS classes
Phone Parser
Parse and format phone numbers, extract country codes
JSONPath Tester
Test JSONPath expressions on JSON data
JSON Schema Validator
Validate JSON data against JSON Schema
IBAN Validator
Validate International Bank Account Numbers
Regular Expression Tester
Test regular expressions with real-time matching
XSD Regex Pattern Tester
Test XSD regular expression patterns
XML Validator
Validate XML data syntax and structure
XML / XSD Validator
Validate XML documents against XSD schemas
Password Strength Checker
Check password strength, entropy, and cracking time
JSONata Expression Tester
Test JSONata expressions against JSON data
Keyboard Keycode Viewer
Press any key to view JavaScript keycode values
JSON Diff Viewer
Compare two JSON documents side by side
XPath Tester
Test XPath expressions against XML/HTML
CSS Selector Tester
Test CSS selectors against HTML
Email Normalizer
Normalize and deduplicate email addresses
WebSocket Tester
Connect to WebSocket endpoints and send messages
Word Document Comparison
Compare two Word documents and highlight differences
PowerPoint Content Extractor
Extract text, images, and metadata from PowerPoint files
Settings
Customize CodeToolPro look & feel
Frequently Asked Questions
Is CodeToolPro really free?
Yes. All 175+ developer tools are completely free. No registration, no credit card, no hidden fees. We build tools for the developer community.
Does CodeToolPro upload my code or data?
Never. All processing happens locally in your browser using client-side JavaScript. Your code, passwords, IP addresses, and data stay on your device — nothing is ever sent to our servers.
Do I need to install anything?
No installation required. CodeToolPro runs entirely in your web browser. Just open the website and start using any of the 175+ developer tools instantly.
What kind of developer tools are available?
We offer JSON/YAML/CSV converters, SQL/HTML/CSS formatters, hash generators, Base64/URL encoders, JWT decoders, regex testers, IP subnet calculators, image tools, text diff, UUID/UUID generators, and many more — all free.
Can I use these tools for production work?
Absolutely. Our tools are designed for professional developers. Whether you are debugging an API, formatting config files, generating test data, or checking IP ranges, CodeToolPro is production-ready.
Is my data secure?
Since everything runs client-side, your data never leaves your browser. There is no backend server processing your content. For sensitive secrets or production keys, we recommend using local CLI tools, but for everyday development tasks, browser-side processing is perfectly secure.