About Tettori Tools
Free Web Tools for Developers
Mission
Tettori Tools aims to provide useful tools that developers use daily - free, without registration, and securely. "Tettori" comes from the Japanese phrase meaning "quick and easy," reflecting our commitment to simplicity and immediate usability.
Features
Completely Free
All tools are free to use. Ads are displayed, but there are no feature restrictions.
Privacy First
All processing happens in your browser. Your input data is never sent to our servers.
No Registration Required
No account or login required. Access the site and start using tools immediately.
Multilingual Support
Available in 14 languages including English, Japanese, Chinese, and Korean. Accessible to developers worldwide.
Available Tools
We currently offer 20+ tools in the following categories: • Text Processing: Character counter, case converter, width conversion, etc. • Encoding/Decoding: Base64, URL, HTML escape, etc. • Data Conversion: JSON formatter, CSV↔JSON, YAML↔JSON, etc. • Generation Tools: UUID, password, QR code, test data, etc. • Validation/Analysis: Regex tester, JWT decoder, CRON expression, etc. • Security: Hash generator, CSP builder, PII detection, etc.
Technical Information
Tettori Tools is built with Next.js, React, TypeScript, and Tailwind CSS. All tools run client-side to protect user privacy.