This is Base64 encoding online tool. It supports standard RFC4648 Base64 encoding as well as url safe Base64 encoding and MIME RFC2045 Base64 encoding for multiple character encodings.
As Base64 is byte encoding, input string must be first encoded to bytes, usually using UTF-8. Additional character encodings supported are Hex, ASCII and Windows-1251.
Padding option enables base64 padding (= characters) as some applications still require it.
Trim spaces option strips heading and trailing whitespace as it is usually not desired when pasting string to encode.