Tettori Tools
Free handy tools for developers' daily use
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.
Tool List
JSON Formatter
Format and validate JSON beautifully
Character Counter
Count characters, words, and lines
Base64 Converter
Base64 encode and decode
URL Encoder
URL encode and decode conversion
Unix Time Converter
Convert between Unix timestamp and datetime
Regex Tester
Test regex patterns in real-time
Diff Checker
Compare differences between two texts
UUID Generator
Generate unique UUID (v4)
Hash Generator
Generate hash values like SHA-256
Password Generator
Create secure passwords easily
QR Code Generator
Generate QR codes from text or URLs
HTML Escape
Escape/unescape HTML special characters
Case Converter
Convert to camelCase, snake_case, kebab-case, etc.
Token Counter
Estimate LLM token count and cost
CSP Policy Builder
Easily create Content Security Policy
Test Data Generator
Generate dummy names, addresses, emails, etc.
CSV/JSON Converter
Convert between CSV and JSON
YAML/JSON Converter
Convert between YAML and JSON
JWT Decoder
Decode JWT tokens and display contents
Color Code Converter
Convert color codes between HEX, RGB, HSL
CRON Expression Builder
Easily create and parse CRON expressions
PII Masker
Detect and mask personal information
Markdown Preview
Real-time Markdown preview
Radix Converter
Convert between binary, decimal, and hexadecimal
Punycode Converter
Convert internationalized domain names (IDN) to Punycode
SQL Formatter
Format SQL queries for readability
JS/CSS Minify & Beautify
Minify and beautify JavaScript and CSS
XML Formatter & Validator
Format and validate XML
HTML Formatter
Format HTML code for readability
htpasswd Generator
Generate htpasswd files for Basic authentication
Byte Converter
Convert between byte units (KB, MB, GB, etc.)
Frequently Asked Questions
Is Tettori Tools free to use?
Yes, all tools are completely free. No account registration required.
Is my data sent to a server?
No, all processing happens in your browser. Your input data is never sent to any server. Use it with confidence.
What tools are available?
We offer 20+ developer tools including JSON formatter, Base64 converter, character counter, regex tester, UUID generator, hash generator, QR code creator, and more.