ToolStack
Every tool you need. One stack.
Free online developer tools. Format JSON, generate UUIDs, create passwords, encode Base64, and 100+ more utilities — all client-side, private, no login required.
🔒
Private by Default
All tools run in your browser. Your data never leaves your device.
⚡
No Login Required
Start using any tool immediately. Zero friction, zero sign-up.
🧰
100+ Tools
JSON formatter, UUID generator, password generator, and much more.
Popular Tools
Guides
Step-by-step tutorials for hashing passwords, formatting JSON, generating QR codes, and more.
Comparisons
Side-by-side feature comparisons of popular developer tools to help you pick the right one.