Free Online Developer Tools
Fast, free, and private. No signup required. All tools run in your browser for maximum privacy and speed.
IP Address Lookup
Find your public IP address, location, ISP, and more
Password Generator
Generate strong, secure passwords with custom options
QR Code Generator
Create QR codes for URLs, text, WiFi, and more
JSON Formatter
Format, validate, and beautify JSON data instantly
Base64 Encoder / Decoder
Encode and decode Base64 strings instantly
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes
Color Picker
Pick colors and convert between HEX, RGB, and HSL
Lorem Ipsum Generator
Generate placeholder text for your designs and layouts
URL Encoder / Decoder
Encode and decode URLs and query strings
User Agent Detector
Detect your browser, OS, device type, and capabilities
Word Counter
Count words, characters, sentences, and estimate reading time
Case Converter
Convert text between UPPERCASE, lowercase, Title Case, and more
Regex Tester
Test regular expressions with real-time matching and highlighting
Markdown Preview
Write Markdown and see a live rendered preview side by side
Timestamp Converter
Convert Unix timestamps to dates and vice versa
Diff Checker
Compare two texts and see differences highlighted line by line
Why Use DevToolbox?
100% Free
All tools are completely free to use with no hidden costs, rate limits, or signup requirements.
Privacy First
Most tools run entirely in your browser. Your data never leaves your device.
Lightning Fast
Client-side processing means instant results with no server round-trips or loading screens.