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We do not keep or inspect the contents of the entered data in any way, and all communications with our servers are made through HTTPS (secured SSL).
Regardless, we are strongly advise to avoid using sensitive data for our tools.
Base64 is a group of similar binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation.
The term Base64 originates from a specific MIME content transfer encoding.
Base64 encoding schemes are commonly used when there is a need to encode binary data that needs to be stored and transferred over media that are designed to deal with textual data. This is to ensure that the data remain intact without modification during transport.
Base64 is commonly used in a number of applications including email via MIME, and storing complex data in XML.
Check here for Base64 Decode Explanation
or check our knowledgebase about Base64 encoding