Free online tools for Developers
Secure password generators, JSON formatters, encoders, and 30+ developer utilities. Everything runs locally in your browser—your data never leaves your device.
Popular Tools
Most used developer utilities
Password Generator
Generate cryptographically secure random passwords with customizable length and character sets.
JSON Formatter & Validator
Format, validate, and beautify JSON with error detection.
JWT Decoder
Decode and inspect JSON Web Tokens (JWT) to view header, payload, and signature info.
UUID Generator
Generate RFC 4122 compliant UUIDs (v4) using cryptographically secure randomness.
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 strings back to plain text.
Bcrypt Hash Generator
Generate bcrypt password hashes with adjustable cost factor for secure password storage.
Tool Categories
Organized by use case
Privacy First
All tools run entirely in your browser using JavaScript. No data is ever sent to any server. No analytics, no tracking, no cookies. Your passwords, tokens, and sensitive data stay on your device.
Why DevToolStack?
Instant Results
No loading, no waiting. Results appear as you type.
Cryptographically Secure
Uses crypto.getRandomValues() for true randomness.
No Tracking
Zero analytics or third-party scripts.
Developer Focused
Built by developers, for developers.