This site provides various useful tools. You can easily use functions that are needed daily, such as conversion tools, image editing, and visualization tools. Each tool provides detailed functionality on a dedicated page. All input data used on each page is processed within the site. No data is sent externally.
The English version is a translation of the Japanese version.
Tools for encoding and decoding text and binary data.
Encode text or binary data to Base64 format, or decode from Base64.
Tools for generating hash values from text.
Generate MD5 hash values from text. Used for data integrity checks and more.
Generate SHA-1, SHA-256, and SHA-512 hash values from text. These are more secure hash algorithms.
Technical information and command explanations.
Explains Git Flow, CircleCI, GitHub Actions, and more.
Explains encryption keys, public keys, shared keys, and other cryptographic technologies.
Explains basic SSH connection settings, X11, PORT forwarding, and more.
Detailed explanation of how HTTPS communication works and the role of SSL/TLS certificates.
Explains blockchain technology, cryptocurrencies, and security best practices.
Explains VPN technology and WiFi security best practices.
Tools for editing and processing images.
Tools for visualizing data and code.
Supports creation and display of graphs and diagrams using DOT language.
Tools for converting text and numbers.
Convert between decimal, hexadecimal, binary, and other number systems.
Tools for calculating dates and times.