Encoding guides

3 practical guides on encoding topics. Each one ends with a free tool that runs entirely in your browser.

• How to Decode a JWT Safely (Without Sending It to a Server)

  A JWT is just three Base64URL strings. Learn how to read one, what each claim means, why decoding is not verifying, and how to inspect tokens without leaking them.

  4 min read · JWT Decoder

• Base64 Is Not Encryption (And Other Common Misconceptions)

  Base64 turns bytes into text and nothing more. Learn how it works, why it is trivially reversible, what it is genuinely good for, and what to use when you need real secrecy.

  3 min read · Base64 & URL Encoder

• URL Encoding (Percent-Encoding) Explained: encodeURIComponent, Spaces, and Double Encoding

  Why URLs need encoding, which characters are reserved, the difference between encodeURI and encodeURIComponent, %20 versus +, and how to avoid double encoding.

  2 min read · Base64 & URL Encoder

← All guides