# DDevTools - Free Online Developer Tools

> Fast, private utilities that run entirely in your browser. Your input data never leaves your device.

DDevTools is a collection of 130+ free, browser-based developer and business tools. All data processing happens locally in your browser—no data is ever sent to servers.

## Core Value Propositions

- **Privacy First**: All processing happens client-side; data never leaves your device
- **Zero Configuration**: Works instantly without sign-ups, accounts, or plugins
- **Completely Free**: No paywalls, no premium tiers, no usage limits
- **Offline Capable**: Works offline after initial page load (PWA)

## Formatters

- [JSON Formatter](https://www.ddevtools.com/json): Format, validate, and minify JSON data
- [JSON Beautifier](https://www.ddevtools.com/json-beautifier): Pretty print and beautify JSON with indentation
- [JSON Viewer](https://www.ddevtools.com/json-viewer): View JSON in an interactive tree structure
- [JSON Minifier](https://www.ddevtools.com/json-minify): Minify and compress JSON by removing whitespace
- [JSON Parser](https://www.ddevtools.com/json-parser): Parse JSON and extract values using JSONPath
- [JSON Validator](https://www.ddevtools.com/json-validator): Validate JSON syntax and check for errors
- [XML Formatter](https://www.ddevtools.com/xml): Format, beautify, and minify XML documents
- [XML Beautifier](https://www.ddevtools.com/xml-beautifier): Pretty print and beautify XML with indentation
- [XML Minifier](https://www.ddevtools.com/xml-minify): Minify and compress XML by removing whitespace
- [XML Validator](https://www.ddevtools.com/xml-validator): Validate XML syntax and check for errors
- [HTML Formatter](https://www.ddevtools.com/html-formatter): Format and beautify HTML with proper indentation
- [HTML Minifier](https://www.ddevtools.com/html-minify): Minify HTML by removing whitespace and comments
- [HTML Validator](https://www.ddevtools.com/html-validator): Validate HTML syntax and check for errors
- [CSS Formatter](https://www.ddevtools.com/css-formatter): Format and beautify CSS code
- [CSS Minifier](https://www.ddevtools.com/css-minify): Minify CSS by removing whitespace and comments
- [JavaScript Formatter](https://www.ddevtools.com/javascript-formatter): Format, beautify, and minify JavaScript online
- [TypeScript Formatter](https://www.ddevtools.com/typescript-formatter): Format, beautify, and minify TypeScript code
- [Python Formatter](https://www.ddevtools.com/python-formatter): Format and beautify Python code with PEP 8 style
- [PHP Formatter](https://www.ddevtools.com/php-formatter): Format, beautify, and minify PHP code
- [Java Formatter](https://www.ddevtools.com/java-formatter): Format, beautify, and minify Java code
- [SQL Formatter](https://www.ddevtools.com/sql): Format and beautify SQL queries for MySQL, PostgreSQL, ClickHouse
- [GraphQL Formatter](https://www.ddevtools.com/graphql-formatter): Format, beautify, and minify GraphQL queries and schemas
- [YAML Validator](https://www.ddevtools.com/yaml): Validate YAML and convert between YAML and JSON
- [Nginx Config Formatter](https://www.ddevtools.com/nginx-formatter): Format and beautify Nginx configuration files
- [JSONL Formatter](https://www.ddevtools.com/jsonl): Convert data to JSONL for AI fine-tuning

## Converters

- [JSON to XML](https://www.ddevtools.com/json-to-xml): Convert JSON data to XML format
- [XML to JSON](https://www.ddevtools.com/xml-to-json): Convert XML data to JSON format
- [XML Converter](https://www.ddevtools.com/xml-converter): Convert XML to JSON, CSV, YAML, or HTML table format
- [JSON to YAML](https://www.ddevtools.com/json-to-yaml): Convert JSON data to YAML format
- [YAML to JSON](https://www.ddevtools.com/yaml-to-json): Convert YAML data to JSON format
- [JSON to CSV](https://www.ddevtools.com/json-to-csv): Convert JSON arrays to CSV format
- [CSV to JSON](https://www.ddevtools.com/csv-json): Convert between CSV and JSON formats
- [JSON to Text](https://www.ddevtools.com/json-to-text): Convert JSON to plain text in various formats
- [JSON to TypeScript](https://www.ddevtools.com/json-to-typescript): Generate TypeScript interfaces from JSON
- [JSON to Python](https://www.ddevtools.com/json-to-python): Generate Python dataclasses and Pydantic models from JSON
- [JSON to C#](https://www.ddevtools.com/json-to-csharp): Generate C# classes and records from JSON
- [JSON to Go](https://www.ddevtools.com/json-to-go): Generate Go structs from JSON
- [XML to CSV](https://www.ddevtools.com/xml-to-csv): Convert XML data to CSV format
- [CSV to XML](https://www.ddevtools.com/csv-to-xml): Convert CSV data to XML format
- [XML to YAML](https://www.ddevtools.com/xml-to-yaml): Convert XML data to YAML format
- [YAML to XML](https://www.ddevtools.com/yaml-to-xml): Convert YAML data to XML format
- [XML to HTML](https://www.ddevtools.com/xml-to-html): Convert XML data to HTML tables or lists
- [HTML to XML](https://www.ddevtools.com/html-to-xml): Convert HTML to well-formed XML
- [HTML to Text](https://www.ddevtools.com/html-to-text): Extract plain text from HTML content
- [HTML to Markdown](https://www.ddevtools.com/html-to-markdown): Convert HTML to clean Markdown format
- [Markdown to HTML](https://www.ddevtools.com/markdown-to-html): Convert Markdown to HTML with GFM support
- [SCSS to CSS](https://www.ddevtools.com/scss-to-css): Compile SCSS/Sass to plain CSS
- [Less to CSS](https://www.ddevtools.com/less-to-css): Compile Less to plain CSS
- [CSS to SCSS](https://www.ddevtools.com/css-to-scss): Convert plain CSS to SCSS with nesting
- [Tailwind to CSS](https://www.ddevtools.com/tailwind-to-css): Convert Tailwind utility classes to vanilla CSS
- [TOML to JSON](https://www.ddevtools.com/toml-to-json): Convert TOML configuration files to JSON
- [JSON to TOML](https://www.ddevtools.com/json-to-toml): Convert JSON to TOML configuration format
- [INI to JSON](https://www.ddevtools.com/ini-to-json): Convert INI configuration files to JSON
- [Java Properties to JSON](https://www.ddevtools.com/properties-to-json): Convert .properties files to JSON
- [CSV to Markdown](https://www.ddevtools.com/csv-to-markdown): Convert CSV data to Markdown tables
- [TSV to JSON](https://www.ddevtools.com/tsv-to-json): Convert tab-separated values to JSON and back
- [Case Converter](https://www.ddevtools.com/case): Convert between camelCase, snake_case, kebab-case, and more
- [Hex to ASCII](https://www.ddevtools.com/hex-to-ascii): Convert between hexadecimal and ASCII text
- [Binary to Text](https://www.ddevtools.com/binary-to-text): Convert between binary and text
- [Number Base Converter](https://www.ddevtools.com/number-base): Convert between binary, octal, decimal, and hex
- [Color Converter](https://www.ddevtools.com/color): Convert between HEX, RGB, and HSL colors
- [OKLCH Color](https://www.ddevtools.com/oklch): Convert and explore colors in the OKLCH color space
- [Byte Converter](https://www.ddevtools.com/byte-converter): Convert between bytes, KB, MB, GB, TB, and PB
- [Time Converter](https://www.ddevtools.com/time-converter): Convert between seconds, minutes, hours, days, weeks, and years
- [Number to Words](https://www.ddevtools.com/number-to-words): Convert numbers to words and words to numbers

## Encoders & Decoders

- [Base64 Encoder/Decoder](https://www.ddevtools.com/base64): Encode and decode Base64 strings
- [Base32 Encoder/Decoder](https://www.ddevtools.com/base32): Encode and decode Base32 for TOTP/2FA secrets
- [Ascii85 Encoder/Decoder](https://www.ddevtools.com/ascii85): Encode and decode Ascii85 (Base85) for PDF and PostScript
- [Quoted-Printable Encoder/Decoder](https://www.ddevtools.com/quoted-printable): Encode and decode Quoted-Printable for email (MIME)
- [URL Encoder/Decoder](https://www.ddevtools.com/url): Encode and decode URL components
- [Punycode Converter](https://www.ddevtools.com/punycode): Convert Unicode domain names to Punycode (IDN) and back
- [HTML Escape/Unescape](https://www.ddevtools.com/html-escape): Escape or unescape HTML entities
- [JavaScript Escape/Unescape](https://www.ddevtools.com/javascript-escape): Escape or unescape JavaScript strings
- [SQL Escape/Unescape](https://www.ddevtools.com/sql-escape): Escape or unescape SQL strings
- [XML Escape/Unescape](https://www.ddevtools.com/xml-escape): Escape or unescape XML special characters
- [CSV Escape/Unescape](https://www.ddevtools.com/csv-escape): Escape or unescape CSV field values
- [JSON Escape/Unescape](https://www.ddevtools.com/json-escape): Escape or unescape JSON string values
- [Regex Escape/Unescape](https://www.ddevtools.com/regex-escape): Escape special regex characters for literal matching
- [Unicode Escape Decoder](https://www.ddevtools.com/unicode-escape): Decode unicode escape sequences to text or encode text to \\uXXXX format
- [UTF-8 Encoder/Decoder](https://www.ddevtools.com/utf8): Encode text to UTF-8 bytes or decode UTF-8 byte sequences to text
- [Full-width / Half-width Converter](https://www.ddevtools.com/fullwidth): Convert between full-width (zenkaku) and half-width (hankaku) characters
- [ROT13 & Caesar Cipher](https://www.ddevtools.com/rot13): Encode and decode text with ROT13 or custom Caesar cipher letter shifts
- [ROT47 Encoder/Decoder](https://www.ddevtools.com/rot47): Encode and decode text with ROT47 cipher that rotates all printable ASCII characters
- [Morse Code Translator](https://www.ddevtools.com/morse): Encode text to Morse code or decode Morse code to text with audio playback
- [JWT Decoder](https://www.ddevtools.com/jwt): Decode and inspect JSON Web Tokens
- [Image to Base64](https://www.ddevtools.com/image-base64): Encode images for GPT-4V, Claude Vision, and Gemini

## Generators

- [UUID Generator](https://www.ddevtools.com/uuid): Generate random UUIDs (v4)
- [Hash Generator](https://www.ddevtools.com/hash): Generate SHA-1, SHA-256, SHA-384, SHA-512 hashes
- [Password Generator](https://www.ddevtools.com/password): Generate secure random passwords with custom options
- [QR Code Generator](https://www.ddevtools.com/qrcode): Generate QR codes for URLs, text, WiFi, and more
- [Favicon Generator](https://www.ddevtools.com/favicon-generator): Create favicons and app icons from text or SVG
- [Lorem Ipsum Generator](https://www.ddevtools.com/lorem): Generate placeholder text for your designs
- [URL Slug Generator](https://www.ddevtools.com/slug): Convert titles to SEO-friendly URL slugs
- [Fancy Text Generator](https://www.ddevtools.com/fancy-text): Transform text into stylized Unicode fonts like bold, italic, and script
- [Meta Tag Generator](https://www.ddevtools.com/meta-tags): Generate Open Graph and Twitter Card meta tags
- [UTM Builder](https://www.ddevtools.com/utm): Create campaign URLs with UTM tracking parameters
- [Cron Builder](https://www.ddevtools.com/cron): Build and understand cron schedule expressions
- [JSON Schema Builder](https://www.ddevtools.com/json-schema): Build JSON schemas for OpenAI structured outputs
- [.htaccess Generator](https://www.ddevtools.com/htaccess-generator): Generate Apache .htaccess rules for redirects, security, and caching
- [Markdown Table](https://www.ddevtools.com/markdown-table): Create markdown tables with a visual editor

## Text Tools

- [String Length Calculator](https://www.ddevtools.com/string-length): Count characters, bytes, words, lines, and paragraphs
- [Text Reverser](https://www.ddevtools.com/text-reverse): Reverse text by characters, words, or lines
- [Text Repeater](https://www.ddevtools.com/text-repeat): Repeat text multiple times with custom separator
- [Remove Duplicate Lines](https://www.ddevtools.com/remove-duplicates): Remove duplicate lines from text
- [Remove Empty Lines](https://www.ddevtools.com/remove-empty-lines): Remove blank lines from text
- [Line Sorter](https://www.ddevtools.com/lines): Sort lines, remove duplicates, and clean up text
- [Word Counter](https://www.ddevtools.com/word-counter): Count words, characters, sentences, and more
- [Text Extractor](https://www.ddevtools.com/extract): Extract emails, URLs, phone numbers from text
- [Regex Tester](https://www.ddevtools.com/regex): Test regular expressions with real-time highlighting
- [Diff Checker](https://www.ddevtools.com/diff): Compare two texts and see the differences
- [Readability Calculator](https://www.ddevtools.com/readability): Analyze text readability with Flesch-Kincaid and more
- [AI Text Cleaner](https://www.ddevtools.com/ai-clean): Remove AI formatting artifacts and invisible characters
- [Prompt Diff](https://www.ddevtools.com/prompt-diff): Compare two prompts and highlight the differences

## Calculators

- [Margin Calculator](https://www.ddevtools.com/margin): Calculate profit margins, markups, and pricing
- [Meeting Cost Calculator](https://www.ddevtools.com/meeting-cost): Calculate the true cost of meetings with live timer
- [Salary Converter](https://www.ddevtools.com/salary): Convert between annual salary and hourly rate
- [Date Calculator](https://www.ddevtools.com/date-calc): Calculate days between dates or add/subtract time
- [Percentage Calculator](https://www.ddevtools.com/percentage-calc): Calculate percentages, find what percent, and percentage change
- [Age Calculator](https://www.ddevtools.com/age-calculator): Calculate exact age in years, months, and days from birthdate
- [Tip Calculator](https://www.ddevtools.com/tip-calculator): Calculate tip amount and split bill among people
- [Discount Calculator](https://www.ddevtools.com/discount-calc): Calculate discounted price and savings from percentage off
- [Chmod Calculator](https://www.ddevtools.com/chmod): Convert Unix file permissions between symbolic and octal formats
- [CIDR Calculator](https://www.ddevtools.com/cidr): Calculate IP subnet information, network addresses, and usable host ranges
- [Token Counter](https://www.ddevtools.com/tokens): Count tokens for GPT, Claude, Llama with cost estimates

## Other Tools

- [Unix Timestamp](https://www.ddevtools.com/timestamp): Convert between Unix timestamps and dates
- [ASCII Table](https://www.ddevtools.com/ascii): Interactive ASCII character reference with decimal, hex, binary, and octal values
- [OG Preview](https://www.ddevtools.com/og-preview): Preview how your links appear on social media
- [Image to Text (OCR)](https://www.ddevtools.com/image-to-text): Extract text from images, screenshots, and documents
- [Private Transcription](https://www.ddevtools.com/transcribe): Transcribe audio to text using on-device AI - your files never leave your browser

## Technical Details

- Framework: Next.js 16 with React 19
- Processing: 100% client-side JavaScript
- Data Storage: None (no server transmission)
- Accessibility: WCAG 2.1 AA compliant
- Performance: Server-side rendering, optimized Core Web Vitals

## Structured Data

Each tool page includes:
- WebApplication schema (tool metadata)
- BreadcrumbList schema (navigation)
- FAQPage schema (4-5 questions per tool)
- HowTo schema (step-by-step guides)

## Content Organization

- Homepage: https://www.ddevtools.com
- Categories: /formatters, /converters, /generators, /encoders, /calculators, /text-tools, /data-tools, /seo-tools, /color-tools
- Individual Tools: /[tool-slug] (130+ tools)
- About: https://www.ddevtools.com/about
- Privacy: https://www.ddevtools.com/privacy
- Sitemap: https://www.ddevtools.com/sitemap.xml

## Optional

- [Full Documentation](https://www.ddevtools.com/sitemap-html): Complete list of all tools and categories
- [About DDevTools](https://www.ddevtools.com/about): Learn more about our privacy-first developer tools