Browser-based developer utilities
These tools run locally in your browser. No API is required for this first Phase 2 batch.
JSON Formatter & Validator
Format messy JSON, validate syntax, and minify JSON when needed.
URL Encoder & Decoder
Encode text for URLs or decode URL-safe strings back to readable text.
Base64 Text Encoder & Decoder
Convert plain text to Base64 or decode Base64 text in the browser.
UUID Generator
Generate secure UUID v4 identifiers for testing, apps, and records.
Unix Timestamp Converter
Convert Unix timestamps to local date/time or get the current timestamp.
SHA-256 Hash Generator
Generate a SHA-256 hash from text using the browser Crypto API.
Regex Tester
Test a JavaScript regular expression against sample text.
HTML Preview
Preview a small HTML snippet safely inside a sandboxed frame.
Developer Tool Guides
Timestamp converter guide · SHA-256 hash guide · UUID generator guide
Developer utilities
Free online developer tools for quick browser tasks
Use these free online developer tools for common web development jobs: format JSON, validate JSON, encode URLs, decode URLs, convert Base64 text, generate UUID v4 values, convert Unix timestamps, create SHA-256 hashes, and test JavaScript regular expressions.
All tools run in the browser, which makes them useful for quick testing, debugging, data cleanup, API response formatting, and frontend development workflows.