Encoding & Decoding Tools

Encoding and decoding are foundational operations in web development, API work, and security. The Base64 Codec converts binary data and text to and from the Base64 alphabet, which is widely used for embedding file data in JSON payloads, constructing HTTP Basic Authentication headers, and encoding cryptographic keys in PEM format. The URL Encoder/Decoder handles percent-encoding, which is required for safely including special characters in URLs, query strings, and form submissions.

Hash generation tools cover the most common algorithms: MD5, SHA-1, SHA-256, SHA-512, and several others. While MD5 and SHA-1 are no longer considered cryptographically secure for password storage or digital signatures, they remain widely used for checksums and file integrity verification — common tasks when working with package downloads, deployed artifacts, or caching systems. The JWT Decoder inspects JSON Web Tokens without requiring a secret key: you can read the header, payload, and verify the structure of any token without being able to forge one.

All encoding and decoding in these tools happens in your browser using the Web Crypto API and standard JavaScript text processing. No data is transmitted to any server. This is especially important for security-sensitive inputs: Base64-encoded credentials, JWT tokens containing user identity claims, and hash values derived from proprietary data can all be processed here without creating a privacy risk. The Unicode Converter and HTML Entity Decoder round out the collection for character encoding tasks that come up in web scraping, data migration, and internationalization work.