Free Online Developer Tools
50+ browser-based utilities. Fast, private, no signup required.
JSON & Data
JSON Formatter
Format, validate & minify JSON
JSON Path Finder
Explore JSON structure & find paths
JSON to CSV
Convert JSON arrays to CSV format
CSV to JSON
Convert CSV data to JSON format
JSON to TypeScript
Generate TS interfaces from JSON
JSON to YAML
Convert JSON to YAML format
YAML to JSON
Convert YAML to JSON format
Fake Data Generator
Generate mock data for testing
Text & String
Word Counter
Count words, characters & sentences
Case Converter
Transform text between cases
Lorem Ipsum
Generate placeholder text
Slug Generator
Convert text to URL-friendly slugs
Whitespace Remover
Clean & strip whitespace from text
Diff Checker
Compare two texts & highlight differences
Text to Binary
Convert text to binary, hex & octal
Morse Code
Translate text to Morse code & back
Encoding & Crypto
Base64 Codec
Encode & decode Base64 strings
URL Encoder
Encode & decode URL components
Hash Generator
Generate MD5, SHA-1 & SHA-256 hashes
Password Generator
Generate strong random passwords
JWT Decoder
Decode & inspect JSON Web Tokens
ROT13
Encode & decode ROT13, ROT5, ROT47
UUID Generator
Generate v4 UUIDs instantly
CSS & Design
CSS Gradient Generator
Build beautiful CSS gradients visually
Box Shadow Generator
Design CSS box shadows with layers
Border Radius Generator
Create CSS rounded corners visually
Color Palette Generator
Create color schemes from any color
Hex to RGB
Convert HEX colors to RGB, HSL & more
Color Converter
Convert between HEX, RGB & HSL
Color Contrast Checker
Check WCAG color contrast compliance
Placeholder Images
Generate placeholder image URLs
Conversion
Markdown Preview
Live preview of Markdown text
Markdown to HTML
Convert Markdown to raw HTML code
HTML to Markdown
Convert HTML to Markdown syntax
Image to Base64
Encode images to Base64 strings
Px to Rem
Convert pixels to rem & em units
File Size Converter
Convert between KB, MB, GB, TB & more
Temperature Converter
Convert °C, °F & Kelvin instantly
Developer
Regex Tester
Test regex patterns with live matching
Cron Parser
Parse cron expressions to human-readable
SQL Formatter
Format & beautify SQL queries
Number Base Converter
Convert between binary, octal, decimal & hex
Subnet Calculator
Calculate subnet masks, ranges & hosts
Unix Permissions
Calculate chmod & file permissions
QR Code Generator
Generate QR codes from any text or URL
Calculators
About DuskTools
DuskTools is a collection of 50+ free online developer tools that run entirely in your browser. No signup, no tracking, no server-side processing — your data stays private. Use our JSON formatter, regex tester, color tools, encoders, and calculators to speed up your workflow. All tools are built for developers, by developers.