Base64 编码 / 解码
将文本编码为 Base64 或解码回来，完整支持 Unicode。
完全在你的浏览器中运行，你输入的任何内容都不会上传。
Base64 是什么？
Base64 turns any data into plain ASCII characters so it can travel safely through email, URLs, JSON and HTML. This tool handles emoji and other Unicode text correctly by encoding it as UTF-8 first. Type in either box and the other updates.