Guide
How to Debug URL and Base64 Encoded Values
Learn the difference between URL encoding, Base64 encoding, and encryption while troubleshooting web parameters and API examples.
Encoding is not encryption
URL encoding and Base64 make data fit into a transport format. They do not protect secrets. Anyone can decode the value with the right tool, so passwords, tokens, and private identifiers should still be treated as sensitive.
Decode only what you need
Long URLs can contain tracking data, redirect destinations, search terms, and user identifiers. Decode the relevant parameter rather than opening unknown links blindly, especially when reviewing logs or support reports.
Watch for double encoding
A value may be encoded more than once when it passes through several systems. Repeated percent signs or strings that still look encoded after one decode pass can indicate double encoding.
Know the input format
Base64 works on bytes, while URL encoding works on URL characters. A string that looks random may be Base64, a token, a hash, or encrypted data. Do not assume the format without context.
Use decoded values carefully
Decoded values can reveal internal URLs, email addresses, or identifiers. Redact them before sharing screenshots or support notes outside the team that needs them.