Free Tools for Developers
JSON, Base64, JWT, UUID, SQL, XML and more — process everyday dev tasks instantly in your browser.
📄JSON
JSON Formatter
Format and beautify JSON data with customizable indentation. Makes messy JSON instantly readable.
JSON Validator
Validate JSON syntax in real-time. Instantly highlights errors with line numbers and descriptions.
JSON Path Tester
Test JSONPath expressions against JSON data. Extract and filter nested values easily.
JSON to TypeScript
Convert JSON data to TypeScript interfaces automatically. Saves time on manual type definitions.
JSON Minifier
Remove whitespace and compress JSON for production use. Reduces file size instantly.
JSON Schema Generator
Automatically generate JSON Schema from JSON data. Useful for API documentation and validation.
JSON Compare
Compare two JSON objects and highlight keys that differ.
JSON to YAML
Convert JSON to YAML format instantly.
JSON Flatten / Unflatten
Flatten nested JSON to dot-notation keys or unflatten back to nested.
JSON Sort
Sort JSON object keys alphabetically or sort JSON arrays by a key.
JSON Repair
Attempt to fix malformed or broken JSON automatically.
JSON Size Analyzer
Analyze JSON structure size: key count, depth, bytes.
JSON Diff
Compare two JSON objects and show a structural diff.
JSON Schema Generator v2
Generate JSON Schema from sample JSON with type inference.
🔄Convert
JSON to CSV Converter
Convert JSON arrays to CSV format instantly. Perfect for exporting data to spreadsheets.
CSV to JSON Converter
Convert CSV data to JSON format. Auto-detects headers and generates JSON objects.
XML Formatter
Format XML data with proper indentation or minify it. Makes XML documents easy to read.
YAML ↔ JSON Converter
Convert YAML to JSON or JSON to YAML. Perfect for config file format conversion.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Supports UTC and local time.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal. Instant cross-base conversion.
Data Size Converter
Convert between bytes, KB, MB, GB, TB. Supports both decimal (SI) and binary (IEC) units.
HTML to Markdown
Convert HTML content to clean Markdown format. Perfect for blog migration and documentation.
TOML ↔ JSON Converter
Convert TOML configuration files to JSON and vice versa. Great for Rust/Cargo projects.
CSV Viewer
Visualize CSV data as a formatted table. Sort columns and inspect data structure.
Date Calculator
Calculate the difference between two dates or add/subtract days.
Timezone Converter
Convert a date/time to multiple world timezones simultaneously.
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, and Rankine.
Length Converter
Convert between mm, cm, m, km, inch, ft, yard, and mile.
Weight Converter
Convert between mg, g, kg, metric ton, oz, lb, and stone.
CSV Statistics
Analyze CSV columns with min, max, average, and frequency stats.
XML to JSON
Convert XML data to JSON format.
JSON to XML
Convert JSON data to XML format.
INI Config Parser
Parse INI configuration files into a visual table.
.env Parser
Parse .env files and display environment variables as a table.
TSV to CSV Converter
Convert TSV (tab-separated) files to CSV (comma-separated).
YAML Validator
Validate YAML syntax and show parse errors.
Unix Time Now
Show current Unix timestamp and convert to/from date.
ISO 8601 Date Parser
Parse and format ISO 8601 date/time strings.
Countdown Timer
Create a countdown timer to any future date and time.
Duration Calculator
Calculate duration between two times or add/subtract time.
Calendar Week Calculator
Get ISO week number for any date and navigate week calendars.
Roman Numeral Converter
Convert between Arabic and Roman numerals.
Force Unit Converter
Convert force units: Newton, pound-force, kgf, dyne.
Locale Number Formatter
Format numbers, currencies and dates using locale settings.
File Size Calculator
Calculate file storage requirements for images, video and data.
🔐Encode
Base64 Encode / Decode
Encode text to Base64 or decode Base64 strings back to plain text instantly.
URL Encode / Decode
Encode or decode URLs using percent-encoding. Supports international characters and special symbols.
String Escape Tool
Escape or unescape strings for JavaScript, Python, SQL, and JSON. Handles special characters.
Image to Base64
Convert images to Base64 data URLs. Drag and drop or paste images directly.
Binary ↔ Text
Convert text to binary (8-bit groups) and back. See character-by-character table.
Morse Code
Convert text to Morse code and back. Reference alphabet table included.
ROT13 / Caesar Cipher
Encode/decode with ROT13 or Caesar cipher with adjustable shift.
Base32 Encode / Decode
Encode text to Base32 (RFC 4648) or decode Base32 back to text.
Punycode Converter
Convert internationalized domain names to Punycode and back.
Base58 Encoder/Decoder
Encode or decode Base58 strings (Bitcoin alphabet).
Base85 Encoder/Decoder
Encode or decode ASCII85/Base85 data.
Caesar Cipher
Encrypt and decrypt text with Caesar cipher (any shift value).
🌐HTML
HTML Escape / Unescape
Escape HTML special characters or unescape HTML entities. Essential for XSS prevention.
HTML Preview
Live preview HTML code in real-time. CSS and JavaScript supported. Great for quick prototyping.
HTML Minifier
Minify HTML by removing comments and collapsing whitespace.
HTML Entities Reference
Searchable reference of common HTML entities with name, code and result.
OG Preview
Preview how your Open Graph meta tags look on Facebook and Twitter.
📝Text
Regex Tester
Test regular expressions in real-time with match highlighting. Supports flags g, i, m, s.
Newline Converter
Convert between LF, CRLF, and CR line endings. Also counts characters, lines, and bytes.
Markdown Preview
Write Markdown and see the rendered HTML in real-time. Great for README and documentation.
Text Diff Viewer
Compare two texts and highlight the differences. Line-by-line diff with color coding.
String Case Converter
Convert strings between camelCase, snake_case, kebab-case, PascalCase, and UPPER_SNAKE_CASE.
Text Counter
Count characters, words, lines, and bytes in text. Supports Japanese character counting.
Text Line Sorter
Sort text lines alphabetically, reverse, or randomly. Remove duplicates with one click.
Number Formatter
Format numbers as comma-separated, scientific notation, currency, hex, binary and more.
Word Frequency Counter
Count word frequencies in text and display the top 20 with visual bars.
Email Validator
Validate email address format and see a breakdown of its parts.
Markdown Table Generator
Visual table editor that generates Markdown table syntax.
Slugify
Convert text to URL-friendly slugs with options for separator and case.
Unicode Lookup
Look up Unicode code points: name, category, hex, HTML entity, UTF-8 bytes.
Regex Library
Curated library of 20+ common regex patterns for email, URL, IP, phone and more.
Text Reverse
Reverse characters, words, or lines. Check for palindromes.
Line Numbers
Add line numbers to text with options for start number and separator.
Levenshtein Distance
Calculate the Levenshtein edit distance between two strings.
Text Statistics
Analyze text with detailed statistics: sentences, paragraphs, avg word length.
Palindrome Checker
Check if text is a palindrome and show analysis.
Anagram Checker
Check if two words are anagrams and sort letters.
Lorem Ipsum HTML
Generate Lorem Ipsum text wrapped in HTML tags.
Bracket Checker
Check if brackets, braces and parentheses are balanced in code.
Whitespace Visualizer
Visualize invisible whitespace characters: spaces, tabs, newlines.
Text Encrypt
Encrypt or decrypt text with Vigenère cipher or XOR cipher.
Character Diff
Compare two strings character by character with inline highlighting.
String Truncator
Truncate strings at a given length with custom ellipsis.
IBAN Validator
Validate IBAN bank account numbers and parse their components.
Reading Time Estimator
Estimate reading time for text content based on WPM.
✨Generate
UUID Generator
Generate UUIDv4 in bulk with one click. Copy individual or all UUIDs instantly.
Lorem Ipsum Generator
Generate Lorem Ipsum dummy text for design mockups. Choose paragraphs, sentences, or words.
Password Generator
Generate strong, secure random passwords. Customize length and character sets.
Cron Expression Parser
Parse and explain cron expressions in plain language. Shows next scheduled run times.
chmod Calculator
Calculate Unix file permissions (chmod). Toggle read/write/execute for owner, group, others.
QR Code Generator
Generate QR codes from URLs, text, or contact info. Download as PNG instantly.
.gitignore Generator
Generate .gitignore files for popular languages and editors.
Semver Parser
Parse semantic version strings and compare two versions.
Docker Run Builder
Build docker run commands visually with ports, volumes and environment variables.
Nginx Config Generator
Generate nginx server block configuration from simple form inputs.
Random Name Generator
Generate random Japanese or English names for testing.
Password Strength Checker
Check password strength, entropy bits, and character set analysis.
Math Expression Evaluator
Evaluate math expressions: +, -, *, /, **, sqrt, sin, cos, log and more.
Stopwatch
Working stopwatch with Start/Stop, Reset, and Lap functionality.
Favicon Generator
Generate favicon PNGs from text on canvas. Preview at 16x16, 32x32, 64x64.
Prime Number Checker
Check if a number is prime and find prime factors.
Fibonacci Generator
Generate Fibonacci sequences up to N terms.
Percentage Calculator
Calculate percentages: X% of Y, percent change, ratio.
Statistics Calculator
Calculate mean, median, mode, std dev, variance from numbers.
Binary Calculator
Perform binary arithmetic: AND, OR, XOR, NOT, shift operations.
GCD / LCM Calculator
Calculate Greatest Common Divisor and Least Common Multiple.
Matrix Calculator
Perform matrix operations: add, subtract, multiply, transpose.
Ratio Calculator
Simplify ratios and calculate equivalent proportions.
.htaccess Generator
Generate Apache .htaccess rules for redirects, auth and more.
Makefile Generator
Generate Makefile templates for common project types.
package.json Generator
Generate package.json files for Node.js projects.
tsconfig.json Generator
Generate tsconfig.json for TypeScript projects with common options.
.eslintrc Generator
Generate ESLint configuration files for popular presets.
Dockerfile Generator
Generate Dockerfiles for common app types: Node, Python, Go.
Barcode Generator
Generate Code128 and EAN barcodes as SVG.
Credit Card Number Generator
Generate test credit card numbers using Luhn algorithm (for testing only).
Password Policy Generator
Generate password policy rules and regex for various security levels.
#️⃣Crypto
Hash Generator (MD5/SHA256)
Generate MD5, SHA-256, and SHA-512 hashes from text. Useful for checksums and data integrity.
CRC32 Checksum
Calculate CRC32 checksum for text or hex data.
HMAC-SHA256 Generator
Generate HMAC-SHA256 signatures with a secret key.
AES Encrypt / Decrypt
Encrypt or decrypt text with AES-256 using a passphrase.
Bcrypt Hash Generator
Generate bcrypt password hashes with configurable salt rounds.
TOTP Generator
Generate TOTP one-time passwords compatible with Google Authenticator.
PEM Decoder
Decode and inspect PEM-encoded certificates and keys.
xxHash Calculator
Calculate xxHash32/xxHash64 checksums for fast hashing.
SSH Key Info
Parse SSH public keys and display key type and fingerprint.
🔑Auth
🔗URL
🗄️Database
SQL Formatter
Format and beautify SQL queries. Supports MySQL, PostgreSQL, and standard SQL dialects.
SQL INSERT to JSON
Parse SQL INSERT statements and convert to a JSON array of objects.
CSV to SQL INSERT
Convert CSV data to SQL INSERT statements. Set table name and options.
SQL Cheatsheet
Searchable SQL command reference with syntax and examples.
💻Code
JavaScript Formatter
Format and beautify JavaScript code. Fixes indentation and spacing automatically.
CSS Formatter / Minifier
Format and beautify CSS code or minify it for production. Removes comments and whitespace.
SVG Minifier
Minify SVG by removing comments, metadata and unnecessary whitespace.
Git Cheatsheet
Searchable Git command reference with examples.
Linux Commands Cheatsheet
Searchable Linux/Bash command reference with explanations.
Vim Cheatsheet
Searchable Vim command reference for navigation, editing and modes.
Regex Cheatsheet
Searchable regular expression syntax reference with examples.
TypeScript Types Reference
Reference for TypeScript built-in types and utility types.
📡API
API Response Formatter
Format and inspect API responses. Supports JSON/XML with status code and header parsing.
HTTP Status Code Reference
Look up HTTP status codes with descriptions. Search by code or keyword.
User Agent Parser
Parse User-Agent strings to extract browser, OS, and device information.
MIME Type Lookup
Look up MIME types by file extension or extension by MIME type.
HTTP Headers Reference
Searchable reference of common HTTP headers with descriptions.
HTTP Security Headers Guide
Guide to HTTP security headers: CSP, HSTS, X-Frame-Options.
🔧Design
Color Converter (HEX/RGB/HSL)
Convert colors between HEX, RGB, and HSL formats. Includes a color picker and preview.
CSS Unit Converter
Convert CSS units: px, rem, em, vw, vh, pt. Set base font size for accurate rem conversion.
Aspect Ratio Calculator
Calculate aspect ratios and scale dimensions. Perfect for video, image, and responsive design.
Color Palette Generator
Generate color palettes from a base color. Includes complementary, triadic, and monochromatic schemes.
Image Compressor
Compress and resize images in the browser. Supports PNG, JPG, WebP with quality control.
CSS Color Names
Browse all CSS named colors with swatches and hex values. Click to copy.
Gradient Generator
Generate CSS linear gradients. Pick colors and direction, copy the CSS.
Box Shadow Generator
Create CSS box-shadow with sliders for offset, blur, spread, and color.
Color Contrast Checker
Calculate WCAG contrast ratio between foreground and background colors.
Border Radius Generator
Adjust corner radii with sliders. Live preview and copy CSS.
Flexbox Generator
Generate CSS flexbox code with visual property selectors and live preview.
Color Opacity Tool
Pick a color and opacity, output rgba, hsla, hex8 and CSS variable.
CSS Animation Generator
Generate CSS @keyframes animations with live preview box.
Color Wheel
Interactive color wheel for exploring hues and color harmonies.
Color Mixer
Mix two colors together and see the result in RGB, HEX, HSL.
Tailwind Colors
Browse all Tailwind CSS colors with hex values. Click to copy.
CSS Variables Generator
Generate CSS custom properties (variables) from color palettes.
Font Size Calculator
Calculate a modular type scale for typography systems.
Viewport Calculator
Calculate CSS viewport units (vw, vh) for screen sizes.
Contrast Ratio Tool
Calculate WCAG contrast ratios with AA/AAA compliance indicators.
Icon / Emoji Lookup
Search and copy emojis and unicode symbols by name.
🔧Network
Subnet Calculator
Calculate subnets and IP ranges from CIDR notation.
CIDR Range Viewer
List all IP addresses in a CIDR block.
IPv4 to IPv6 Converter
Convert IPv4 addresses to IPv4-mapped IPv6 notation.
MAC Address Lookup
Look up MAC address OUI vendor information.
Network Speed Calculator
Calculate file transfer time at given network speeds.
Bandwidth Calculator
Convert between bandwidth units: bps, Kbps, Mbps, Gbps.
TCP Flags Reference
Reference guide for TCP flags: SYN, ACK, FIN, RST, PSH, URG.
HTTP Methods Reference
Reference for HTTP methods: GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS.
HTTP Request Builder
Build and format HTTP requests with method, headers, and body.
DNS Record Types
Reference guide for DNS record types: A, AAAA, CNAME, MX, TXT, NS, SOA.
Port Numbers Reference
Look up well-known port numbers and their associated services.
Network Prefix Table
Table of all /0 to /32 prefixes with host counts and masks.
IP to Binary Converter
Convert IPv4 addresses to binary and decimal representations.
VLSM Calculator
Variable Length Subnet Mask calculator for efficient IP allocation.
OSI Layers Reference
Interactive reference for the 7 OSI network model layers.
Packet Size Calculator
Calculate packet sizes, MTU, and fragmentation for network protocols.
BGP ASN Reference
Look up BGP Autonomous System Number ranges and reserved blocks.
HTTP Status Cats
HTTP status codes illustrated with cat images. Fun reference.
cURL Command Builder
Build curl commands from URL, method, headers and body.
URL Info
Detailed breakdown of URL components with security checks.
iptables Rule Generator
Generate iptables firewall rules from a visual form.
CORS Headers Checker
Validate and explain CORS headers for cross-origin requests.
Ping / Latency Calculator
Calculate network latency and throughput from ping RTT values.
SSL/TLS Info Reference
Reference guide for SSL/TLS versions, cipher suites and security.
IPv6 Expand / Compress
Expand compressed IPv6 addresses or compress them to shortest form.