Toolzbelt is a free collection of browser-based developer and productivity utilities. Every tool runs entirely client-side — your input never leaves your device.

Plenty of "online tools" sites quietly send your data to a server to do the work. Toolzbelt has no backend for any of it. Paste an API key into the hash generator or a production config into the JSON formatter, and the processing happens in your own browser tab. No signup, no install, no upload.

Tools

• Password Generator — random passwords and memorable passphrases, with live strength scoring
• JSON Formatter — format and validate JSON, with clear error positions
• Base64 Encoder / Decoder — text and data, both directions
• Regex Tester — live matching against sample text, plus a syntax reference and example patterns
• Cron Generator — build 5-field cron expressions from plain settings, or paste one to read back what it actually means
• UUID Generator — v4 and v7, generated in bulk
• Hash Generator — cryptographic hashes for any text input
• Color Converter — convert between HEX, RGB, and HSL
• What's My IP — your public IP and connection details

Guides

Reference pages like our Password Security Guide cover the why behind the tools — what actually makes a password strong, where hashing fits, and the common mistakes.

Available in English and Spanish, works on mobile, and free with no account and no usage limits.