Developer Tools

Developer & data utilities: converters, generators and more.

194 tools available
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Favorites
Text & writing
Case Converter
Add Prefix & Suffix to Lines
Diff Checker / Text Compare
Lorem Ipsum Generator
Markdown Preview & HTML Converter
Converters
Code to Image Converter
World Date & Time Formats
JSON ↔ YAML
JSON Formatter
CSV to JSON Converter
JSON to CSV Converter
Base64 Encode / Decode
Image to Base64 Converter
URL Encode / Decode
SQL Formatter & Beautifier
XML Formatter & Beautifier
HTML Entity Encoder & Decoder
JSON to Code Generator
Slugify: URL Slug Generator
String Escape & Unescape
HTML to Markdown Converter
Archive Converter
Font Converter
HTML to JSX Converter
URL Parser & Query Builder
Data & spreadsheets
Spreadsheet Converter
Clean Spreadsheet Data
Excel ↔ JSON / XML
Merge Excel Files
Split Spreadsheet
Remove Duplicate Rows
Compare Two Spreadsheets
Transpose & Pivot
Column Tools
CSV Delimiter Converter
Spreadsheet to HTML Table
Sheet Statistics
Find & Replace / Bulk Edit
Generators
Email Signature Builder
Icon to PNG
App Icon Generator
Favicon Generator
CSS Box Shadow Generator
CSS Border Radius Generator
CSS Gradient Generator
Glassmorphism Generator
Neumorphism Generator
Flexbox Playground
Bootstrap Flex Playground
Bootstrap Grid Playground
CSS Grid Playground
Cubic-Bézier Easing Editor
Fake Data Generator
QR Code Generator
QR Code Scanner
Online Whiteboard
Barcode Generator
Chart Maker
UUID / ULID Generator
Password Generator
Hash Generator
Image to ASCII Art
Developer utilities
Code Formatter
Code Minifier
Array Formatter
Regex Tester
Cron Expression Builder
JWT Decoder
Timestamp Converter
ASCII / Unicode List
MIME Type List
Exit Codes Reference
Linux Signals
Regex Token Reference
Markdown Syntax Reference
Git Command Reference
chmod Calculator
Morse Code Translator
Braille Translator & Reference
ASL Fingerspelling Alphabet
Language Codes (ISO 639)
Diacritics & Accent Reference
Country Info Directory
Currency Codes (ISO 4217)
International Dialing Codes
cURL to Code Converter
JavaScript Tester
JavaScript Obfuscator
Error Code Lookup
Timezone Directory
Online API Tester
Cheat sheets
JavaScript Cheat Sheet
PHP Cheat Sheet
MySQL Cheat Sheet
Python Cheat Sheet
Shell Cheat Sheet
SSH Cheat Sheet
CSS Cheat Sheet
Vim Cheat Sheet
Excel Cheat Sheet
VS Code Cheat Sheet
Claude Code Cheat Sheet
Git Cheat Sheet
Regex Cheat Sheet
Keyboard Shortcuts
cURL Cheat Sheet
SASS Cheat Sheet
jQuery Cheat Sheet
PowerShell Cheat Sheet
Docker Cheat Sheet
Bootstrap Cheat Sheet
Laravel Cheat Sheet
React Cheat Sheet
TypeScript Cheat Sheet
Java Cheat Sheet
C++ Cheat Sheet
Go Cheat Sheet
Rust Cheat Sheet
HTML Cheat Sheet
Markdown Cheat Sheet
Tailwind CSS Cheat Sheet
Emmet Cheat Sheet
PostgreSQL Cheat Sheet
SQL Joins Cheat Sheet
Google Sheets Formula Cheat Sheet
Kubernetes / kubectl Cheat Sheet
GitHub Actions Cheat Sheet
tmux Cheat Sheet
Big-O Cheat Sheet
System & device
User-Agent Parser
What Is My IP
Internet Speed Test
Screen Resolution Checker
Monitor Refresh Rate Test
Dead Pixel Test
Mic Test
Webcam Test
Keyboard Tester
Mouse Tester
Full White Screen
Full Black Screen
Full Red Screen
Full Green Screen
Full Blue Screen
Web & SEO
HTTP Status Codes
HTTP Methods
HTTP Headers Reference
DNS Record Types
TCP/UDP Port Numbers
Subnet / CIDR Calculator
CSS Units Reference
File Signatures (Magic Numbers)
HTML Color Names
HTML Entities Directory
TLD Directory
Meta Tag Generator
Open Graph Generator
Schema.org / JSON-LD Generator
robots.txt Generator
XML Sitemap Generator
SEO Traffic & Value Calculator
SEO Title & Description Length Checker
DNS Lookup
WHOIS Lookup
SSL Checker
HTTP Header Checker
Website Down Checker
Website Technology Checker
Website Screenshot Generator
Cloud Link Downloader
Broken Link Checker
Open Port Checker
MAC Address Lookup
Email Header Analyzer
SPF Record Generator & Checker
DKIM Record Generator & Checker
DMARC Record Generator & Checker
Email Address Validator
UTM Link Builder
.htaccess Generator
.htpasswd Generator
.gitignore Generator
Privacy Policy Generator
Terms & Conditions Generator
Cookie Policy Generator
Pixel to EM/REM Converter
Screen Resolutions & Aspect Ratios
AI & Prompts
AI Prompt Generator
AI Prompt Optimizer
AI Text-to-SQL Generator
AI Token & Cost Calculator
AI Context Window Calculator
Website builders
AI Website Builder
AI Theme Builder

About Developer Tools

The developer tools gather the everyday utilities of web developers and data people: format and validate JSON, SQL and XML, encode and decode Base64 and URLs, convert JSON, YAML and CSV, test regular expressions, decode JWT tokens, convert timestamps and generate UUIDs, hashes and passwords.

Web tools check DNS records, WHOIS data, SSL certificates and HTTP headers, generate meta tags, robots.txt and sitemaps, and test whether a website is down. Spreadsheet tools convert, clean, merge, split and compare Excel and CSV files.

You will also find CSS generators, QR code and barcode makers, device tests for your screen, microphone, webcam and keyboard, and dozens of cheat sheets and references. Almost every developer tool is free.

Frequently asked questions

Almost all of them are free, including the formatters, encoders, converters, generators, references and cheat sheets. The few AI tools use credits, and their price is shown before you run them.

Most formatters, encoders and converters work directly in your browser, so your data never leaves your computer. Tools that need a server, such as the DNS or SSL checkers, only send what they need to run.

Paste your JSON into the JSON Formatter: it beautifies, minifies and validates it, and points out syntax errors.

Yes. The Spreadsheet Converter changes the format of your sheets, and Excel ↔ JSON / XML turns a spreadsheet into structured data.

No. Every developer tool runs in your web browser, on any operating system, with nothing to install.
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