About 3STF Tools
3STF Tools is a growing collection of 23+ free online tools built for developers, writers, designers, and creators. Every tool runs entirely in your browser — no data is ever sent to a server, no accounts are needed, and everything is free forever.
Our Mission
We believe the best tools are the ones that respect your privacy and just work. No popups asking you to sign up, no ads cluttering the interface, no "premium" tiers locking features behind paywalls. Just fast, useful tools that get out of your way.
Privacy First
Every tool on 3STF Tools processes data locally in your browser using JavaScript. Your text, images, passwords, and files never leave your device. We don't use cookies for tracking, we don't collect personal data, and we don't sell anything. What you do with our tools is your business alone.
Built With
- Next.js & React — fast, modern web framework
- Tailwind CSS — clean, responsive design
- TypeScript — type-safe, reliable code
- Vercel — global edge deployment
- Web APIs — Canvas, Crypto, Speech, and more
Suggest a Tool
Have an idea for a tool we should build? Found a bug or want to give feedback? We'd love to hear from you.