All tools.
127+ free developer tools, organized by category.
JSON Tools
12JSON Formatter
Format and beautify JSON data with syntax highlighting and collapsible tree view.
JSON Minifier
Minify and compress JSON by removing all whitespace.
JSON Validator
Validate JSON syntax and get descriptive error messages with line numbers.
JSON Diff
Compare two JSON objects and visualize the differences.
JSON to YAML
Convert JSON data to YAML format instantly.
JSON to CSV
Convert JSON arrays to CSV format, ready to open in Excel.
JSON to TypeScript
Generate TypeScript interfaces and types from JSON data.
JSON to Go Struct
Generate Go struct definitions from JSON data.
JSONPath Tester
Test JSONPath expressions against JSON data and see results instantly.
JSON Schema Generator
Generate a JSON Schema from any JSON document automatically.
JSON to TOML
NewConvert JSON data to TOML configuration format.
JSON Viewer
NewInteractive collapsible tree view for exploring and navigating JSON data.
Text Tools
17Case Converter
Convert text between camelCase, snake_case, PascalCase, UPPER_CASE, kebab-case, and more.
Word Counter
Count words, characters, sentences, paragraphs, and reading time.
Slug Generator
Generate URL-friendly slugs from any text string.
Markdown Preview
Write Markdown and preview the rendered HTML output in real-time.
Diff Checker
Compare two text blocks side by side and highlight the differences.
Lorem Ipsum Generator
Generate placeholder lorem ipsum text in paragraphs, words, or lists.
Regex Tester
Test regular expressions with real-time match highlighting, flags, and capture groups.
Find & Replace
Bulk find and replace text with support for regex and case sensitivity.
Sort Lines
Sort lines alphabetically, numerically, reverse or randomly.
Remove Duplicate Lines
Remove duplicate lines from text, keeping unique lines only.
ASCII Art Text Generator
NewConvert text to ASCII art using block character fonts.
String Inspector
NewDeep-inspect any string: byte length, entropy, character types, encoding, line endings.
URL Parser
NewParse any URL into its components: protocol, host, path, query params, and hash.
QueryString Parser
NewParse and edit URL query strings with key-value table view.
User Agent Parser
NewParse User-Agent strings to detect browser, OS, device type, and engine.
Unit Converter
NewConvert between units of length, weight, temperature, area, volume, speed, and more.
Keycode Info
NewPress any key to see its keyCode, key name, code, and event properties.
Encoding & Decoding
10Base64 Encoder
Encode text or files to Base64 format for safe data transmission.
Base64 Decoder
Decode Base64 encoded strings back to plain text or binary data.
URL Encoder / Decoder
Percent-encode and decode URLs and query string parameters.
HTML Entity Encoder
Encode and decode HTML entities like &, <, >, and more.
Hex Converter
Convert between hexadecimal, decimal, binary, and octal number systems.
Unicode Lookup
Look up Unicode code points, search by character name, and convert between encodings.
JWT Decoder
Decode and inspect JWT tokens — header, payload, and signature — without verification.
Base58 Encoder / Decoder
NewEncode and decode data using Bitcoin Base58 and Base58Check encoding.
Number Base Converter
NewConvert numbers between binary, octal, decimal, hex, and any base from 2–36.
Data URL Generator
NewConvert files to Base64 data URLs and decode data URLs back to files.
Security & Crypto
12Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512, and SHA-3 hashes from text or files.
Password Generator
Generate strong, random passwords with configurable length and character sets.
UUID Generator
Generate RFC 4122 UUIDs (v1, v4, v5, v7) individually or in bulk.
Password Strength Checker
Check the strength of a password using entropy analysis and common patterns.
bcrypt Generator
Hash and verify passwords using the bcrypt algorithm securely in the browser.
HMAC Generator
Generate HMAC signatures using SHA-256, SHA-512, or MD5 with a secret key.
Random String Generator
Generate cryptographically secure random strings, tokens, and API keys.
ULID Generator
NewGenerate Universally Unique Lexicographically Sortable Identifiers (ULIDs).
Basic Auth Generator
NewGenerate HTTP Basic Authentication headers from username and password.
RSA Key Pair Generator
NewGenerate RSA public/private key pairs (2048/4096-bit) in PEM format using Web Crypto API.
Data Encryptor
NewEncrypt and decrypt text using AES-256-GCM with PBKDF2 key derivation — all client-side.
BIP39 Passphrase Generator
NewGenerate BIP39 mnemonic seed phrases (12–24 words) for cryptocurrency wallets.
CSS Tools
10CSS Formatter
Format and beautify CSS code with consistent indentation and spacing.
CSS Minifier
Minify CSS by removing comments, whitespace, and redundant rules.
Box Shadow Generator
Visually build CSS box shadows with live preview and code output.
Border Radius Generator
Visually design CSS border-radius shapes with a live preview.
Flexbox Generator
Build CSS flexbox layouts visually with live code output.
Glassmorphism Generator
Create beautiful glassmorphism effects with backdrop-filter and live preview.
CSS Triangle Generator
NewGenerate pure CSS triangles using the border trick, with live preview.
CSS Cursors Reference
NewInteractive reference for all CSS cursor types with live hover demo.
SVG Optimizer
NewOptimize and minify SVG files by removing unnecessary attributes and whitespace.
SVG to CSS
NewConvert SVG code to CSS background-image data URI for inline use.
HTML Tools
7HTML Formatter
Format and beautify HTML markup with proper indentation.
HTML Minifier
Minify HTML by removing whitespace, comments, and optional tags.
HTML Preview
Write HTML and instantly preview the rendered output in a sandboxed frame.
Markdown to HTML
Convert Markdown to clean HTML markup ready to embed.
HTML Sanitizer
NewRemove unsafe HTML tags and attributes while keeping safe markup.
HTML to Text
NewExtract plain text from HTML, preserving structure and optionally converting links.
HTML Validator
NewValidate HTML structure for common errors, missing attributes, and accessibility issues.
JavaScript Tools
2YAML Tools
6YAML Formatter
Format and validate YAML configuration files.
YAML to JSON
Convert YAML to JSON format with one click.
YAML to TOML
Convert YAML configuration files to TOML format.
TOML Formatter
NewFormat, validate, and minify TOML configuration files.
TOML to JSON
NewConvert TOML configuration files to JSON format.
TOML to YAML
NewConvert TOML configuration files to YAML format.
CSV & Data
3XML Tools
6XML Formatter
NewFormat, beautify, and minify XML documents with syntax validation.
XML Validator
NewValidate XML documents and get detailed error messages with line numbers.
XML Minifier
NewMinify XML by removing whitespace and comments to reduce file size.
XML to JSON
NewConvert XML documents to JSON format with attribute and namespace support.
XML to YAML
NewConvert XML documents to YAML format.
XPath Tester
NewTest XPath expressions against XML documents and see matching nodes.
SQL Tools
1Date & Time
4Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates in any timezone.
Cron Expression Builder
Build and parse cron expressions with a visual editor and next-run preview.
Timezone Converter
Convert times between any two timezones with DST awareness.
Date Difference Calculator
Calculate the exact difference between two dates in days, months, years, and more.
Networking
7HTTP Status Codes
Complete reference for all HTTP status codes with descriptions and use cases.
MIME Types Reference
Search and browse all MIME types and their associated file extensions.
CIDR Calculator
Calculate IP ranges, subnet masks, and broadcast addresses from CIDR notation.
IP Address Validator
Validate IPv4 and IPv6 addresses and get detailed information.
Port Reference
Look up well-known TCP/UDP ports and their associated services.
Device Information
NewView detailed browser, device, screen, and hardware information.
Chmod Calculator
NewCalculate Unix file permissions with a visual toggle grid and symbolic/octal notation.
Generators
13QR Code Generator
Generate QR codes for URLs, text, contact info, and more with custom sizes.
Meta Tag Generator
Generate HTML meta tags for SEO, Open Graph, and Twitter Cards.
robots.txt Generator
Generate a robots.txt file for your website with custom rules.
.gitignore Generator
Generate .gitignore files for any language, framework, or tool.
Dummy JSON Generator
Generate realistic fake JSON data for API mocking and testing.
SVG Wave Generator
Generate beautiful SVG wave shapes for website backgrounds and sections.
Placeholder Image Generator
NewGenerate SVG placeholder images with custom size, color, and text — no external service.
Image Compressor
NewCompress JPEG, PNG, and WebP images client-side using the Canvas API.
Image Cropper
NewCrop images with precise pixel controls and aspect ratio presets — no upload needed.
Barcode Generator
NewGenerate Code 128, EAN-13, and Code 39 barcodes as SVG in the browser.
QR Code Scanner
NewScan QR codes using your device camera or upload an image.
Pomodoro Timer
NewFocus timer with 25-minute work sessions, short breaks, and long breaks.
Structured Data Generator
NewGenerate JSON-LD structured data markup for articles, products, FAQs, and more.
API Tools
4cURL Builder
NewBuild cURL commands visually — set method, headers, auth, body, and options with a live cURL output.
REST Client
NewMake HTTP requests directly from your browser — set method, URL, headers, and body, then inspect the response.
HTTP Playground
NewBuild and visualize raw HTTP requests — see exactly what your request looks like on the wire.
JWT Builder
NewCreate and sign JWT tokens — set header, payload, and secret to generate a valid token.
References
4Git Cheatsheet
Essential Git commands with explanations, examples, and quick copy.
CSS Properties Reference
Complete reference for CSS properties with browser compatibility notes.
Regex Cheatsheet
Quick reference for regular expression syntax, flags, and patterns.
HTTP Headers Reference
Complete reference for HTTP request and response headers.
DevOps Tools
2Math & Numbers
2Color Tools
5Color Information
NewGet complete color info: HEX, RGB, HSL, HSV, CMYK, and color harmonies.
Color Picker & Converter
NewPick colors and convert between HEX, RGB, HSL, HSV, and CMYK — with color harmonies and palette export.
Color Contrast Checker
NewCheck WCAG 2.1 AA/AAA color contrast ratios for foreground and background pairs.
Color Palette Generator
NewGenerate beautiful color palettes from a base color — shades, tints, complements, and harmonies.
CSS Gradient Builder
NewCreate CSS linear, radial, and conic gradients visually with full CSS output and copy.
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