Developer Tools
Tools for Developers
119 tools available
Available Tools
JSON Formatter & Validator
Format, validate, and beautify JSON online. Free, instant, 100% private - your data never leaves your browser.
UUID Generator
Generate random UUIDs (Universally Unique Identifiers) instantly. Create 1 to 20 UUIDs at once with our free online UUID generator.
Timestamp Converter
Convert Unix timestamps to human-readable dates. Supports seconds and milliseconds. Free online epoch time converter.
Text Diff
Compare two texts and find differences. Highlight added, removed, and unchanged lines. Free online text comparison tool.
Regex Tester
Test and debug regular expressions with live highlighting. Support for all regex flags. See match details and capture groups. Free online regex tester.
HTML Prettifier
Format and beautify HTML code with proper indentation. Make minified HTML readable. Free online HTML prettifier and formatter.
CSS Minifier
Minify CSS code to reduce file size. Remove comments, whitespace, and optimize stylesheets. Free online CSS minifier.
JavaScript Minifier
Minify JavaScript code to reduce file size. Remove comments, whitespace, and compress scripts. Free online JavaScript minifier.
HTML Entity Encoder
Encode and decode HTML entities. Convert special characters to HTML entities and back. Free online HTML encoder.
JWT Decoder
Decode and inspect JWT tokens. View header, payload, and signature. Check expiration status. Free online JWT decoder tool.
Cron Expression Parser
Parse and understand cron expressions. See human-readable descriptions and next scheduled run times. Free online cron parser tool.
Random Number Generator
Generate random numbers with custom range. Support for decimals, unique numbers, and batch generation. Free online random number generator.
Barcode Generator
Generate barcodes in multiple formats including Code 128, EAN-13, UPC, Code 39. Free online barcode generator tool.
JSON Path Finder
Click on any element in your JSON to get its path. Supports dot and bracket notation. Free online JSON path finder tool.
Aspect Ratio Calculator
Calculate aspect ratios and resize dimensions. Keep proportions when resizing images or videos. Free online aspect ratio calculator.
Number Base Converter
Convert numbers between binary, decimal, hexadecimal, and octal. Easy number base conversion. Free online number converter.
Color Palette Generator
Generate beautiful color palettes. Create harmonious color schemes from any base color. Free online palette generator.
Unit Converter
Convert between different units of measurement. Length, weight, temperature, volume, and more. Free online unit converter.
IP Address Lookup
Find your public IP address and location information. Free IP lookup tool with geolocation data, ISP info, and more.
Age Calculator
Calculate your exact age in years, months, days, hours, and minutes. Find out how old you are precisely with our free age calculator.
BMI Calculator
Calculate your Body Mass Index (BMI) with our free online calculator. Get instant results with health category classification.
Percentage Calculator
Calculate percentages easily with our free online calculator. Find percentage of a number, percentage change, and more.
Countdown Timer
Create a countdown timer to any date. Track days until your next event, birthday, holiday, or any special occasion.
Tip Calculator
Calculate tips easily and split bills among friends. Choose tip percentage, see total with tip, and divide evenly with our free tip calculator.
Loan Calculator
Calculate loan payments, interest rates, and amortization schedules. Free online loan calculator for mortgages, car loans, and personal loans.
World Clock
View current time in cities around the world. Compare timezones, add cities to track, and see time differences easily.
CSS Gradient Generator
Create beautiful CSS gradients with our free generator. Linear, radial, and conic gradients with live preview and copy-to-clipboard.
Invoice Generator
Create professional invoices online for free. Add items, calculate totals, and download PDF invoices instantly.
Calorie Calculator
Calculate your daily calorie needs based on age, weight, height, and activity level. Get personalized nutrition recommendations.
CSS Shadow Generator
Create custom CSS box shadows with our visual generator. Adjust blur, spread, color, and more. Copy CSS code instantly.
JSON Viewer
View, explore, and navigate JSON data with our interactive tree viewer. Collapse, expand, search, and copy JSON paths.
Border Radius Generator
Create beautiful CSS border-radius values with our visual generator. Customize each corner individually, preview in real-time, and copy CSS code instantly.
Flexbox Generator
Create CSS flexbox layouts visually. Set flex-direction, justify-content, align-items, gap, wrap and more. Preview in real-time and copy CSS code.
Button Generator
Create beautiful CSS buttons with hover effects, gradients, shadows, and animations. Customize colors, borders, padding and copy production-ready CSS code.
Coin Flipper
Flip a virtual coin instantly! Perfect for making random decisions. Track your flip history and see the heads/tails ratio.
Dice Roller
Roll virtual dice for games, D&D, or random decisions. Support for D4, D6, D8, D10, D12, D20 and custom dice. Roll multiple dice and track history.
Spin Wheel
Make random decisions with our interactive spin wheel! Add your own options, customize colors, and let fate decide. Perfect for games, raffles, and choices.
Compound Interest Calculator
Calculate compound interest on your investments. See how your money grows over time with our interactive compound interest calculator and growth chart.
Discount Calculator
Calculate discounts, sale prices, and savings instantly. Find final prices after percentage off, compare multiple discounts, and see how much you save.
Date Calculator
Calculate date differences, add or subtract days from dates, and find days between two dates. Perfect for planning deadlines, events, and countdowns.
URL Slug Generator
Generate SEO-friendly URL slugs from any text. Convert titles to lowercase, remove special characters, replace spaces with hyphens. Perfect for blog posts and web pages.
Meta Tag Generator
Generate SEO meta tags, Open Graph tags, and Twitter cards for your website. Improve search engine visibility and social media sharing with optimized meta tags.
CSS Grid Generator
Create CSS Grid layouts visually. Set columns, rows, gaps, and alignment. Preview in real-time and copy production-ready CSS code.
Robots.txt Generator
Generate robots.txt files for your website. Control search engine crawling with allow/disallow rules, sitemap references, and crawler-specific settings.
Privacy Policy Generator
Generate a customized privacy policy for your website or app. Covers data collection, cookies, GDPR, CCPA, and third-party services. Free and instant.
Fake Data Generator
Generate realistic fake data for testing and development. Create random names, emails, addresses, phone numbers, and more. Export as JSON or CSV.
Color Contrast Checker
Check color contrast ratios for WCAG 2.1 accessibility compliance. Test foreground and background colors for AA and AAA standards. Free online tool.
Binary Text Converter
Convert text to binary code and binary to text instantly. Support for ASCII and UTF-8 encoding. Free online binary translator tool.
CSS Text Shadow Generator
Create beautiful CSS text shadow effects visually. Customize offset, blur, color, and add multiple shadows. Generate CSS code instantly.
SQL Formatter
Format and beautify SQL queries online. Support for MySQL, PostgreSQL, SQL Server, and Oracle syntax. Make your SQL readable and clean.
HTML Entities Reference
Complete reference of HTML entities and character codes. Search and copy HTML entities for symbols, special characters, and more.
Markdown Table Generator
Create markdown tables visually with our easy-to-use generator. Add rows, columns, set alignment, and copy the markdown code instantly.
Time Zone Converter
Convert times between different time zones instantly. Compare multiple time zones at once and find the best meeting times across the globe.
Meeting Cost Calculator
Calculate how much your meetings really cost based on attendee salaries and meeting duration. Make more informed decisions about meeting time.
HTTP Status Codes Reference
Quick reference for all HTTP status codes. Search and filter by category - informational, success, redirect, client error, and server error codes.
User Agent Parser
Parse and analyze user agent strings. Detect browser, operating system, device type, and more from any user agent string.
JSON Schema Generator
Generate JSON Schema from your JSON data automatically. Create validation schemas for your APIs and data structures.
API Tester
Test REST API endpoints directly in your browser. Send GET, POST, PUT, DELETE requests and view responses with headers.
Chmod Calculator
Calculate Unix file permissions. Convert between numeric (octal) and symbolic chmod formats. Interactive permission selector.
URL Parser
Parse and analyze URL components. Extract protocol, host, path, query parameters, and more from any URL.
Code Beautifier
Format and beautify code in multiple languages. Support for JavaScript, TypeScript, JSON, HTML, CSS, SQL, and more.
IP Address Converter
Convert IP addresses between different formats. IPv4 to decimal, binary, hex. IPv6 expansion and compression. CIDR notation calculator.
JSON Diff
Compare two JSON objects and see the differences. Highlight added, removed, and modified properties. Visual diff viewer.
SVG Optimizer
Optimize SVG files for the web. Remove unnecessary data, compress paths, and reduce file size while maintaining quality.
CSS Variables Generator
Generate CSS custom properties online. Create design system tokens for colors, spacing, and typography.
Tailwind to CSS
Convert Tailwind CSS classes to vanilla CSS online. Understand what each class does.
HTML Minifier
Minify HTML code online for free. Remove whitespace and comments to reduce file size.
JSON to TypeScript
Convert JSON to TypeScript interfaces online. Auto-generate type definitions from JSON data.
.env Generator
Generate .env files online. Create environment variable templates for your projects.
.gitignore Generator
Generate .gitignore files online. Select your stack and get the right ignore patterns.
package.json Generator
Generate package.json files online. Configure your Node.js project with ease.
.htaccess Generator
Generate .htaccess rules online. Create redirects, security headers, and more for Apache.
Nginx Config Generator
Generate Nginx server configurations online. Create virtual hosts, SSL, and proxy settings.
Crontab Generator
Generate crontab expressions online. Visual scheduler for cron jobs with explanations.
Subnet Calculator
Calculate subnets, CIDR notation, network addresses, and host ranges. Free online subnet calculator for network engineers. Get instant IP calculations.
IBAN Validator
Validate IBAN numbers instantly. Check format, country code, and checksum. Verify international bank account numbers for accuracy before transfers.
JWT Generator
Generate and decode JSON Web Tokens (JWT) for authentication. Create tokens with custom claims, choose algorithms, and verify signatures securely.
Google Maps Embed Generator
Generate responsive Google Maps embed code for your website. Customize map type, size, and zoom level. Copy ready-to-use HTML code in seconds.
Credit Card Validator
Validate credit card numbers using the Luhn algorithm. Check card type, format, and validity instantly.
MAC Address Generator
Generate random MAC addresses for testing and development. Choose format, case, and quantity. Create valid unicast or multicast addresses with vendor prefixes.
AI Prompt Builder
Build effective AI prompts with our structured prompt builder. Create clear, detailed prompts for ChatGPT, Claude, and other AI tools.
YouTube Embed Generator
Generate customized YouTube embed codes with autoplay, loop, start time, and privacy options. Perfect for websites and blogs.
Spotify Embed Generator
Generate Spotify embed codes for tracks, albums, playlists, and podcasts. Create custom music players for your website. Free and easy to use.
App Store Badge Generator
Generate official App Store and Google Play download badges for your app. Customize colors and download in multiple formats.
UTM Builder
Build UTM tracking links for Google Analytics campaigns. Add source, medium, campaign, and other parameters easily.
Canonical URL Generator
Generate canonical URL tags to prevent duplicate content issues. Improve your SEO with proper canonical implementation.
CNPJ/CPF Validator
Free CNPJ and CPF validator for Brazilian tax identification numbers. Validate, format, and generate test CNPJ/CPF numbers instantly.
PAN Card Validator
Free PAN card validator for India. Validate PAN number format, decode entity type, and understand PAN card structure instantly.
IBAN Generator
Generate valid IBAN (International Bank Account Number) for testing. Free IBAN generator for all European countries.
EU VAT Number Validator
Validate EU VAT identification numbers. Check VAT number format and validity for all European Union countries.
NIE/NIF Validator
Validate Spanish NIE (NΓΊmero de Identidad de Extranjero) and NIF (NΓΊmero de IdentificaciΓ³n Fiscal) numbers. Check format and control digit.
ABN Validator
Validate Australian Business Numbers (ABN). Check the 11-digit ABN format and verify the check digit algorithm.
SIRET/SIREN Validator
Validate French SIRET (14 digits) and SIREN (9 digits) business identification numbers using the Luhn algorithm.
Partita IVA Validator
Validate Italian Partita IVA (VAT numbers). Check the 11-digit format and verify the control digit using the Italian algorithm.
Keyword Density Analyzer
Analyze keyword density in your content for SEO optimization. Find top keywords, phrases, and get density percentages. Free online SEO tool.
SERP Preview Tool
Preview how your page will appear in Google and Bing search results. Optimize your title and meta description for better click-through rates.
Heading Structure Checker
Analyze your HTML heading structure for SEO. Check H1-H6 hierarchy, find missing headings, and ensure proper semantic structure.
Meta Tag Analyzer
Analyze your webpage's meta tags for SEO optimization. Check title, description, Open Graph, Twitter Cards and more. Free online SEO tool.
Sitemap Generator
Generate XML sitemaps for your website. Create regular sitemaps or sitemap indexes. Set priority, change frequency, and lastmod dates. Free SEO tool.
Robots.txt Tester
Test and validate your robots.txt file. Check if URLs are blocked or allowed for different search engine crawlers like Googlebot and Bingbot.
JSON to TOML Converter
Convert JSON configuration files to TOML format online for free. Transform JSON objects into TOML config syntax. No upload required - 100% private browser-based conversion.
TOML to JSON Converter
Convert TOML configuration files to JSON format online for free. Transform TOML syntax into JSON objects. No upload required - 100% private browser-based conversion.
JSON to Go Struct Converter
Convert JSON to Go struct definitions instantly. Generate Go types with proper field names, JSON tags, and nested struct support. Free online tool.
JSON to Python Class Converter
Convert JSON to Python class or dataclass instantly. Generate type-annotated Python classes with proper field types. Free online tool.
JSON to Java Class Converter
Convert JSON to Java class (POJO) instantly. Generate Java classes with getters/setters or Lombok @Data annotation. Free online tool.
JSON to C# Class Converter
Convert JSON to C# class instantly. Generate C# classes with properties or records with JSON serialization attributes. Free online tool.
ENV to JSON Converter
Convert .env environment files to JSON format instantly. Parse environment variables with optional quote handling. Free online tool.
JSON to ENV Converter
Convert JSON to .env environment file format instantly. Generate environment variables from JSON with proper escaping. Free online tool.
INI to JSON Converter
Convert INI configuration files to JSON format instantly. Parse sections, booleans, and numbers. Free online tool.
JSON to INI Converter
Convert JSON to INI configuration file format instantly. Generate sectioned INI files from nested JSON objects. Free online tool.
Properties to JSON Converter
Convert Java .properties files to JSON format instantly. Parse nested keys, numbers, and booleans. Free online tool.
SQL to JSON Schema Converter
Convert SQL CREATE TABLE statements to JSON schema instantly. Parse columns, types, and constraints. Free online tool.
Workdays Calculator
Free workdays calculator to count business days between two dates. Exclude weekends and holidays. Perfect for project planning and payroll calculations.
Week Number Calculator
Free week number calculator. Find the ISO week number for any date. Useful for business planning, scheduling, and international date references.
Julian Date Converter
Free Julian date converter. Convert between Julian Day Numbers, Modified Julian Date, and calendar dates. Used in astronomy, aviation, and military.
WCAG Contrast Checker
Free WCAG contrast checker. Test color combinations for accessibility compliance. Check AA and AAA conformance levels for text and UI components.
Alt Text Generator
Free alt text generator for images. Create accessible, SEO-friendly image descriptions. Get HTML and Markdown output with best practice guidelines.
A/B Test Calculator
Free A/B test calculator. Calculate statistical significance for your experiments. Get z-score, p-value, and confidence intervals for conversion rate tests.
Sample Size Calculator
Free sample size calculator for A/B tests and surveys. Calculate the minimum sample size needed for statistically significant results.
π Instant results, faster than AI. No signup. 100% private.
Back to all tools