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Developer Tools

Free, fast, and powerful utilities for developers. No sign-up required. All tools work offline in your browser for maximum privacy and security.

Used by over 10,000+ developers worldwide. Save time with our collection of essential developer tools designed to solve common programming challenges.

Popular
📋

JSON Formatter & Validator

Format, validate, and beautify JSON data instantly. Supports large files up to 10MB with syntax highlighting and error detection.

Syntax ValidationPrettify/MinifyError Detection
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API Tester

Test REST APIs with GET, POST, PUT, DELETE requests. View response headers, status codes, and formatted JSON responses.

REST API TestingHeaders ManagementAuthentication Support
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SQL Formatter

Format, beautify, and validate SQL queries online. Supports MySQL, PostgreSQL, SQL Server, and more.

Multiple DialectsBeautify SQLSyntax Validation
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JWT Decoder

Decode and verify JSON Web Tokens. View header, payload, and signature. Supports HS256, RS256, and other algorithms.

Token DecodingSignature VerificationMultiple Algorithms
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🔍

Regex Playground

Build and test regular expressions with live pattern matching. Visual match highlighting and common regex patterns library included.

Live TestingMatch HighlightingPattern Library
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Base64 Encoder/Decoder

Encode and decode Base64 strings instantly. Supports text, files, and URL-safe encoding with one-click copy.

Text EncodingFile SupportURL-safe Mode
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Text Diff Viewer

Compare two text files or snippets side-by-side. Highlight differences, added lines, and removed lines instantly.

Side-by-Side CompareHighlight DiffsInstant Results
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Markdown to HTML Converter

Convert Markdown to HTML with GitHub-flavored markdown support. Live preview with syntax highlighting for code blocks.

GFM SupportLive PreviewCode Highlighting
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Cron Expression Generator

Generate cron expressions with visual interface. Supports all cron formats with human-readable descriptions and next run times.

Visual BuilderNext Run PreviewMultiple Formats
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QR Code Generator

Generate high-quality QR codes for URLs, text, Wi-Fi, email, and more. Customize colors and download as PNG/SVG.

Custom ColorsHigh ResolutionVarious Formats
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Code Snippet Manager

Store, organize, and share code snippets. Supports 50+ programming languages with syntax highlighting and tags.

Multi-language SupportSyntax HighlightingTag Organization
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URL Encoder/Decoder

Encode or decode URLs for safe transmission. Convert special characters to percent-encoded format.

URL EncodingURL DecodingBatch Support
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UUID Generator

Generate unique identifiers (UUIDs) for your applications. Version 4 (random) UUIDs with batch generation.

Batch GenerationUUID v4Copy All
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Color Converter

Convert colors between HEX, RGB, HSL, and CMYK formats. Pick colors visually and copy code instantly.

HEX/RGB/HSL/CMYKColor PickerInstant Conversion
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Hash Generator

Generate cryptographic hashes (SHA-1, SHA-256) for your text. Perfect for data integrity verification.

SHA-256SHA-1Fast Hashing
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Password Generator

Generate strong, random passwords with customizable length and character types. Security strength indicator included.

Custom LengthCharacter OptionsStrength Meter
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Timestamp Converter

Convert between Unix timestamps and human-readable dates. Real-time current timestamp display.

Unix TimestampISO 8601Real-time Clock
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String Case Converter

Convert text between camelCase, snake_case, kebab-case, PascalCase, and more. Essential for coding conventions.

Camel/Snake/KebabInstant ConversionRobust Parsing
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TOON Converter

Convert JSON data into the compact, token-efficient TOON format to reduce LLM token costs. Includes real-time validation and copy functionality.

JSON to TOON ConversionReal-time ValidationCopy to Clipboard
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🧊

Glassmorphism Generator

Generate beautiful glassmorphism CSS effects. Adjust blur, transparency, and saturation for the perfect frosted glass look.

Visual EditorLive PreviewCSS Code Generation
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🤖

AI Prompt Builder

Craft structured, high-quality prompts for LLMs. Includes templates for Role, Task, Context, and Constraints to get better results.

Structured InputPrompt TemplatesLive Preview
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Lorem Ipsum Generator

Generate placeholder text for your designs. Customizable paragraph length, word count, and HTML tag options.

Paragraphs/WordsAdjustable CountStandard Text
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JSON to Zod Converter

Instantly generate Zod validation schemas from JSON objects. Essential for TypeScript developers building robust APIs.

Auto Type InferenceNested ObjectsArray Support
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🎨

Tailwind Gradient Generator

Visually design beautiful gradients and generate Tailwind CSS classes instantly. Supports custom colors and directions.

Visual EditorLive PreviewTailwind Classes
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👻

CSS Box Shadow Generator

Visual generator for CSS box-shadow property. Adjust offsets, blur, spread, and color with real-time preview.

Visual EditorReal-time PreviewCSS Code
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Border Radius Generator

Generate advanced CSS border-radius shapes. Control all 4 corners individually or create complex organic shapes.

8-point ControlVisual PreviewCSS Copy
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PX to REM Converter

Convert pixels to REM and vice versa based on root font size. Essential for responsive web design.

BidirectionalCustom Base SizeInstant Calc
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0️⃣

Text to Binary Converter

Convert text into binary code (010101). Useful for understanding computer data representation.

Text to BinarySpace SeparationCopy Result
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1️⃣

Binary to Text Converter

Decode binary strings back into readable text. Handles standard 8-bit binary sequences.

Binary to TextError DetectionCopy Result
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📝

Word & Character Counter

Count words, characters, sentences, and paragraphs in your text. Real-time analysis for writers.

Word CountChar CountSentence Count
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🍅

Pomodoro Timer

Boost productivity with the Pomodoro technique. 25-minute focus intervals with 5-minute breaks.

Focus TimerBreak TimerAudio Alerts
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Online Stopwatch

Simple and accurate stopwatch with lap functionality. Measure time intervals with millisecond precision.

Start/StopLap TimesReset
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Aspect Ratio Calculator

Calculate dimensions based on aspect ratio. Useful for images, video, and responsive containers.

Ratio PresetsWidth/Height CalcVisual Preview
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Percentage Calculator

Calculate percentages easily. What is X% of Y? X is what % of Y? Percentage increase/decrease.

Multiple ModesInstant CalcClear Formulas
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🎂

Age Calculator

Calculate your exact age in years, months, days, hours, and minutes from your date of birth.

Exact AgeNext BirthdayTime Alive
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BMI Calculator

Calculate Body Mass Index (BMI) based on height and weight. Understand your weight category.

Metric/ImperialBMI ScoreCategory Info
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Discount Calculator

Calculate final price after discount. See exactly how much you save on sales.

Savings AmountFinal PriceTax Support
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💰

Tip Calculator

Calculate tips and split bills easily. Ensure everyone pays their fair share.

Bill SplitTip PercentageTotal Per Person
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🎲

Random Number Generator

Generate true random numbers within a specific range. Good for lotteries, games, and sampling.

Min/Max RangeMultiple NumbersNo Duplicates
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🔗

URL Slug Generator

Convert text into SEO-friendly URL slugs. Removes special characters and replaces spaces with dashes.

SEO FriendlyRemove AccentsCustom Separator
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HTML Entity Encoder

Encode text to HTML entities to safely display special characters in web pages.

Encode/DecodeSpecial CharsSafe HTML
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HTML Entity Decoder

Decode HTML entities back to normal text. Useful for cleaning up scraped content.

DecodePreviewClean Text
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📊

CSV to JSON Converter

Convert Comma Separated Values (CSV) data into JSON format. Supports custom delimiters.

Header SupportCustom DelimiterTree View
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📉

JSON to CSV Converter

Convert JSON data into CSV format for Excel or other spreadsheet software.

Flatten ObjectsCustom DelimiterDownload CSV
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User Agent Parser

Identify browser, operating system, and device from a User Agent string.

Browser DetectionOS DetectionDevice Type
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Device Information

Get detailed information about your current device, screen resolution, and browser capabilities.

Screen SizePixel RatioColor Depth
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Keycode Info

Press any key to get its JavaScript key code, event code, and other keyboard event properties.

Event.keyEvent.codeEvent.which
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😀

Emoji Picker

Browse and search thousands of emojis. One-click copy to clipboard.

SearchableCategoriesSkin Tones
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🖼️

Random Image Generator

Generate random placeholder images from Unsplash or Picsum. Customizable size and category.

Custom SizeKeywordsDirect Link
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Reaction Time Test

Test your visual reaction speed. Wait for the color to change and click as fast as you can.

MillisecondsAverage ScoreTry Again
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Typing Speed Test

Measure your typing speed (WPM) and accuracy with simple typing tests.

WPM CalcAccuracy %Timer
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📞

Phone Number Parser

Format and parse phone numbers. Extract country code and carrier info (simulated).

FormatCountry CodeValidation
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Credit Card Validator

Validate credit card numbers using the Luhn algorithm. Identify card type (Visa, MC, etc).

Luhn CheckCard TypeFormat Check
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Roman Numeral Converter

Convert numbers to Roman numerals and back. Historical and fun.

BidirectionalLarge NumbersInstant
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Free Developer Tools for Modern Development

DevMetrix.cloud provides a comprehensive suite of free developer tools designed to streamline your workflow and boost productivity. Whether you're a frontend developer, backend engineer, DevOps specialist, or full-stack developer, our tools help you solve common programming challenges quickly and efficiently.

Why Choose Our Developer Tools?

Popular Developer Tools

JSON Formatter & Validator

Format, validate, and beautify JSON data with syntax highlighting. Perfect for debugging API responses and configuration files.

API Tester

Test REST APIs with custom headers, authentication, and request bodies. A lightweight alternative to Postman for quick API testing.

JWT Decoder

Decode and inspect JSON Web Tokens (JWT) to view header, payload, and signature components. Essential for debugging authentication issues.

Regex Playground

Build and test regular expressions with live pattern matching and visual highlighting. Includes common regex patterns library.

Base64 Encoder/Decoder

Encode and decode Base64 strings instantly. Supports URL-safe encoding and handles large files efficiently.

Tools for Every Developer

Our tools are designed for developers of all skill levels, from beginners learning to code to experienced engineers working on production systems. Each tool is carefully crafted to solve specific problems you encounter in daily development work.

Frequently Asked Questions

Are these tools really free?

Yes! All our developer tools are completely free to use with no limitations on basic features. No credit card required.

Do I need to create an account?

No signup required. You can start using all tools immediately without creating an account.

Is my data secure?

Absolutely. All tools process data entirely in your browser using JavaScript. Your sensitive data never leaves your device or gets sent to our servers.

Can I use these tools offline?

Yes! Once the page is loaded, most tools work completely offline since all processing happens in your browser.

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