Free Developer Utilities
Fast, privacy-first developer tools. All processing happens locally in your browser. No accounts required, no data sent to our servers.
ToolPad is a set of online utilities for developers and DevOps: JSON diff and formatter, JWT decoder, Base64 and URL encoder, UUID and hash generator, timestamp converter, regex tester, and JSON-to-CSV. Every tool runs in your browser—your data never leaves your device.
JSON Diff Tool
Compare two JSON objects side-by-side. Highlight added, removed, and changed keys instantly. Free online JSON diff tool.
UUID Generator
Generate UUIDs (v4 and v1) instantly. Bulk generation up to 500 UUIDs. Copy or download as text file.
JWT Decoder
Decode JWT tokens instantly. View header and payload as JSON. See expiration dates in human-readable format.
JSON Formatter & Validator
Format and validate JSON instantly. Pretty print with custom indentation or minify. Free online JSON formatter.
Base64 Encode Decode
Encode text to Base64 or decode Base64 to text instantly. Free online Base64 encoder and decoder tool.
Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Support for seconds and milliseconds. View in UTC and local time.
Regex Tester
Test regular expressions instantly. Highlight matches, view match groups, and test with flags. Free online regex tester.
URL Encode Decode
Encode or decode URL components instantly. Support for %20 and + encoding. Free online URL encoder and decoder.
Hash Generator
Generate MD5, SHA-1, and SHA-256 hashes instantly. Free online hash generator using Web Crypto API.
JSON to CSV Converter
Convert JSON arrays to CSV format instantly. Choose delimiter (comma or semicolon). Download or copy CSV output.
Why Use Our Tools?
Privacy First
All processing happens in your browser. We never see or store your data.
Fast & Free
No sign-ups, no accounts, no limits. Use our tools instantly without any barriers.
Always Available
Works offline, no server required. Your data never leaves your device.