💻 Free Developer Tools
Essential tools for developers. Format JSON, test regex patterns, encode/decode data, parse cron expressions, and more. All free and private.
87 free tools available
JSON Formatter
Format, validate, and minify JSON data with syntax highlighting.
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 strings back to plain text.
Regex Tester
Test and debug regular expressions in real-time. Matches highlighted, capture groups, replacements.
CSV to JSON Converter
Convert CSV data to JSON arrays and JSON arrays back to CSV. Custom delimiters supported.
Text Diff Checker
Compare two texts and see additions, removals, and unchanged lines highlighted side by side.
Image to Base64 Converter
Convert images to Base64 encoded strings and data URIs. Supports PNG, JPEG, GIF, WebP, and SVG. No upload, fully private.
Cron Expression Parser
Parse and understand cron expressions. See next run times and get a human-readable description of any cron schedule.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal. Supports big numbers. Instant conversion with bit analysis.
HTML to Markdown Converter
Convert HTML code to clean Markdown. Supports headings, links, images, tables, lists, code blocks, and more.
Subnet Calculator
Calculate network address, broadcast address, host range, and wildcard mask for any IP address and CIDR notation.
What Is My IP Address
Find your public IP address instantly. See your location, ISP, timezone, and geolocation data. Look up any IP address.
CSS Box Shadow Generator
Create beautiful CSS box shadows with a visual editor. Multiple layers, presets, live preview, and one-click copy.
Meta Tag Generator
Generate HTML meta tags for SEO, Open Graph, and Twitter Cards. Preview search results and social media appearance.
PX to REM Converter
Convert pixels to rem and em units. Adjustable base font size, live preview, and quick reference table for common sizes.
SQL Formatter
Format, beautify, and minify SQL queries. Configurable indentation and keyword casing. Supports SELECT, INSERT, UPDATE, DELETE, CREATE.
JWT Decoder
Decode and inspect JSON Web Tokens (JWT). View header, payload, claims, and check expiration status. No data sent to any server.
YAML Formatter & Converter
Format YAML, convert YAML to JSON or JSON to YAML. Validate and beautify configuration files. 100% client-side.
CSS Minifier & Beautifier
Minify CSS to reduce file size or beautify compressed CSS for readability. Remove comments and whitespace. Shows savings percentage.
User Agent Parser
See your browser user agent string and detect browser, OS, device type, and engine. Analyze any user agent string.
Binary Calculator
Perform arithmetic and bitwise operations on binary numbers. Supports addition, subtraction, AND, OR, XOR, NOT, and bit shifts.
PPI Calculator
Calculate pixels per inch (PPI) for any screen. Compare device densities and find retina-quality displays.
HTML Beautifier
Format, indent, and beautify messy HTML code instantly. Supports minification too. Great for cleaning up HTML from any source.
Chmod Calculator
Calculate Linux file permissions in numeric (octal) and symbolic notation. Visual permission selector with common presets.
Email Validator
Validate email addresses for correct format, common typos, disposable domains, and RFC compliance. Bulk validation supported.
XML Formatter
Format, indent, and beautify XML code instantly. Minify XML to reduce file size. Validate XML structure.
JavaScript Beautifier
Format, indent, and beautify JavaScript code. Minify JS to reduce file size. Free online JavaScript formatter.
CSS Formatter
Format, indent, and beautify CSS code. Minify CSS to reduce file size. Free online CSS beautifier.
Crontab Generator
Visual cron expression builder. Generate crontab schedules with a simple UI. Preview next run times. Common presets included.
URL Parser
Parse URLs into components: protocol, host, port, path, query parameters, hash. Decode and encode URLs.
Markdown Table Generator
Create perfectly formatted Markdown tables with column alignment, live preview, and CSV import.
HTTP Status Codes
Complete reference for HTTP status codes from 100 to 511. Search, filter by category, and copy codes instantly.
Flexbox Playground
Interactive CSS Flexbox playground. Visualize flex-direction, justify-content, align-items, gap, and more with live code output.
Border Radius Generator
Generate CSS border-radius with visual preview. Supports individual corners, elliptical shapes, and fancy blob shapes.
JSON to YAML Converter
Convert between JSON and YAML formats instantly. Syntax validation, formatting options, and copy with one click.
CSS Grid Generator
Visually build CSS Grid layouts with custom columns, rows, gaps, and alignment. Preview your grid live and copy the generated CSS and HTML.
JSON to TypeScript
Convert JSON objects into TypeScript interfaces automatically. Supports nested objects, arrays, optional fields, and readonly properties.
Markdown to HTML
Convert Markdown text to clean HTML instantly. Supports headings, lists, links, images, code blocks, tables, and more.
HTML Entity Encoder / Decoder
Encode special characters to HTML entities or decode them back. Supports named, decimal, and hex entities.
JSON Validator
Validate JSON data with clear error messages. Auto-fix common issues, format, minify, and analyze your JSON structure.
URL Slug Generator
Convert text into SEO-friendly URL slugs. Handles special characters, diacritics, and multiple languages.
XML to JSON Converter
Convert XML data to JSON format instantly. Paste or upload XML and get clean, formatted JSON output. Handles nested elements, attributes, and text nodes.
JSON to XML Converter
Convert JSON data to well-formed XML. Handles nested objects, arrays, attributes, and custom root elements with proper indentation.
CSS Animation Generator
Create CSS keyframe animations visually. Preview, customize timing, easing, and export production-ready CSS code instantly.
Regex Builder
Build regular expressions visually with real-time matching, a cheat sheet, and common pattern library. No more guessing at regex syntax.
Encryption Tool
Encrypt and decrypt text with AES-256-GCM encryption. Password-protected, 100% client-side via Web Crypto API. No data sent to any server.
Keyboard Tester
Test every key on your keyboard with a visual layout. Press keys to verify they work. Detect stuck or broken keys instantly. Progress tracking included.
Code Diff Tool
Compare two blocks of text or code side by side. Highlights additions, deletions, and changes with color coding. Free online diff checker.
Robots.txt Generator
Generate robots.txt files for your website. Control search engine crawling with allow/disallow rules, sitemap references, and crawl-delay settings.
Schema Markup Generator
Generate JSON-LD structured data for SEO. Article, FAQ, Product, LocalBusiness, Event, Recipe, HowTo, and WebSite schema types.
CSS Gradient Generator
Create beautiful CSS gradients visually. Linear, radial, and conic gradients. Multiple color stops, presets, random generator. Copy CSS code instantly.
What's My IP
Find your public IP address instantly. See location, ISP, hostname, timezone. Look up any IP address. Free, no signup required.
CSS Clip-Path Generator
Create complex CSS clip-path shapes with draggable control points. Supports polygon, circle, ellipse, and inset with preset shapes.
JSON Path Finder
Paste JSON data and click any value to get its dot notation or bracket path. Visualize and navigate complex JSON tree structures.
Table Generator
Build tables visually with a spreadsheet-like editor. Export as HTML, Markdown, CSV, or JSON. Add rows, columns, sort, and auto-save.
Glassmorphism Generator
Create CSS glassmorphism effects with live preview. Adjust blur, opacity, saturation, and border for frosted glass UI.
HTML Live Editor
Write HTML, CSS, and JavaScript with instant live preview. Built-in code editor with auto-run and sandboxed output.
JSON Schema Generator
Generate JSON Schema from sample JSON data. Supports Draft-07 and Draft 2020-12 with automatic type inference.
SVG Optimizer
Optimize and minify SVG code. Remove metadata, comments, hidden elements, and shorten IDs for smaller file sizes.
README Generator
Generate professional README.md files for your GitHub projects. Templates for libraries, apps, and APIs with live Markdown preview.
cURL Converter
Convert cURL commands to Python, JavaScript, Go, PHP, Ruby, and more. Paste a curl command, get clean code instantly.
OG Image Preview
Preview how your website looks when shared on Twitter, Facebook, LinkedIn, and Discord. Debug Open Graph and Twitter Card meta tags.
.htaccess Generator
Generate Apache .htaccess rules for redirects, caching, security headers, CORS, and more. Copy production-ready configurations.
CSP Header Generator
Build Content Security Policy headers with an interactive builder. Select directives, sources, and copy the complete header.
Chmod Calculator
Calculate Unix file permissions visually. Convert between symbolic and octal notation. See owner, group, and other permissions.
SVG to CSS Background
Convert SVG code to a CSS background-image data URI. Encode SVGs for use in CSS without external files. URL-encode or Base64.
Gradient Border Generator
Create CSS gradient borders with live preview. Linear, conic, and radial gradients with animation option.
CSS Filter Generator
Generate CSS filter effects with live preview. Blur, brightness, contrast, grayscale, hue-rotate, saturate, sepia.
Font Size Converter
Convert between px, rem, em, pt, vw, and other CSS font size units. See live preview and comparison table.
Diff Checker
Compare two texts side by side and find differences instantly. Highlights additions, deletions, and changes with line numbers.
JSON Beautifier & Minifier
Format, minify, and validate JSON with customizable indentation, key sorting, tree view, and detailed statistics.
CSS Box Model Visualizer
Interactive CSS box model explorer. Adjust margin, border, padding, and content dimensions with live preview and generated CSS.
Hex Editor
View and edit file contents in hexadecimal. Drag and drop files, search hex patterns, and export modified data.
Crontab Guru
Visual cron expression editor with human-readable descriptions, next 5 run times, field-by-field editing, and common presets.
DNS Lookup
Query DNS records for any domain using Google DNS. Check A, AAAA, MX, TXT, CNAME, NS, and SOA records with copy and export.
SVG to React Component
Convert SVG code to React JSX components. Auto-renames attributes (stroke-width to strokeWidth), converts inline styles, supports TypeScript, memo, and forwardRef.
JSON Escape / Unescape
Escape special characters for JSON strings or unescape JSON-encoded strings. Handles newlines, tabs, quotes, and unicode.
CSS Variables Generator
Create CSS custom properties for design systems. Define colors, spacing, typography, and shadows. Export as CSS :root or SCSS variables.
JSON Diff
Compare two JSON objects side by side. Highlights additions, deletions, and changes with color-coded diff view.
Neumorphism Generator
Create soft UI neumorphism CSS effects with live preview. Adjust size, radius, distance, intensity, blur, and color for stunning soft shadows.
API Tester
Test REST APIs directly from your browser. Send GET, POST, PUT, PATCH, DELETE requests with custom headers and body. View responses with timing.
Cron Job Generator
Build cron expressions visually with an interactive editor. See next run times and human-readable descriptions. Presets for common schedules.
DNS Record Generator
Generate DNS records for your domain. Create A, AAAA, CNAME, MX, TXT, SRV, and other record types with proper syntax and validation.
Nginx Config Generator
Generate Nginx configuration files with a visual editor. Set up reverse proxy, SSL, caching, gzip, security headers, and rate limiting.
.htaccess Generator
Generate Apache .htaccess files with common rules. HTTPS redirect, security headers, GZIP compression, browser caching, and URL redirects.
Docker Compose Generator
Generate docker-compose.yml files visually. Add services, configure ports, volumes, and dependencies. Templates for common stacks like Node.js, WordPress, Nginx.
Git Command Generator
Find and copy any Git command. 40+ commands organized by category: basics, branches, merging, undo, stash, tags, and remote operations.
Text Encryptor
Encrypt and decrypt text with AES-256 encryption. Password-protected, runs entirely in your browser.
Frequently Asked Questions
Can I use these tools for production data?
Yes, since everything runs in your browser, it is safe to use with sensitive or production data. Nothing is sent to any server.
Are regex patterns tested in real-time?
Yes, our regex tester evaluates patterns as you type with instant highlighting, match groups, and flag support.
Do developer tools support different formats?
Yes, tools like the JSON formatter support minification, prettification with custom indentation, and validation with detailed error messages.