Essential Developer Tools All in One Place
Popular Developer Tools
Access commonly-used tools instantly. No installation, no configuration, just tools that work.
API Playground
Test REST APIs in browser - Make GET, POST, PUT, DELETE requests with headers and JSON body
QR Code Generator
Create custom QR codes for URLs, text, WiFi, vCards, and more
Regex Tester
Test and debug regular expressions with real-time matching
Color Picker & Gradient Generator
Pick colors, convert formats, generate gradients, and check accessibility
Password Generator
Generate secure, random passwords with customizable options
Lorem Ipsum Generator
Generate placeholder text for designs, mockups, and layouts
Word Counter
Count words, characters, sentences, and analyze text statistics
Text Diff Checker
Compare two texts and highlight differences line-by-line
JSON Formatter
Format, validate, and beautify JSON data with syntax highlighting
Case Converter
Convert text between UPPERCASE, lowercase, camelCase, snake_case, and more
Timestamp Converter
Convert between Unix timestamps and human-readable dates
JWT Encoder/Decoder
Encode and decode JSON Web Tokens (JWT)
URL Encoder/Decoder
Encode and decode URLs and query parameters
UUID Generator
Generate unique UUIDs (v4, v1, v7) with bulk options
JSON Converter
Convert between JSON, CSV, and YAML formats
Base64 Encoder/Decoder
Encode and decode text or files to/from Base64 format
Hash Generator
Generate SHA256, MD5, SHA-512 cryptographic hashes
Number Base Converter
Convert numbers between Binary, Octal, Decimal, and Hexadecimal
Log Analyzer
Analyze and filter logs with syntax highlighting - Find errors, warnings, and debug info quickly
HTML Entity Encoder
Encode and decode HTML entities for safe display and XSS prevention
Why Developers Love Zerno
Lightning Fast
All tools run in your browser. No server roundtrips, instant results.
Privacy First
Your data never leaves your browser. No tracking, no data collection.
Always Free
No subscriptions, no hidden costs. Free forever for all developers.
Auto-saved History
Your work is automatically saved locally. No sign-up, no login required.
Ready to boost your productivity?
Start using our tools now. No sign-up required, all tools run in your browser.