Encode text to Base64 or decode it back, with full Unicode support — Chinese, emoji and other multi-byte characters are converted correctly via UTF-8, and a URL-safe variant (no +, / or =) is one click away.
Base64 represents any bytes with 64 safe characters, making it a common way to pass binary-ish data in URLs, JSON, data URIs and HTTP Basic authentication headers.
Frequently asked questions
Is Base64 encryption?
No — it is an encoding, not encryption. Anyone can decode it; never use it to hide secrets.
Why does encoded text get longer?
Every 3 bytes become 4 characters, about a 33% size increase.
What is URL-safe Base64?
A variant replacing + and / with - and _ and dropping padding, so the result can sit inside a URL query without escaping.
中文说明
文本与 Base64 互转，完整支持 Unicode——中文、emoji 等多字节字符通过 UTF-8 正确处理；URL 安全变体（不含 +、/、=）也只需一键。
Base64 用 64 个安全字符表示任意字节，常用于在 URL、JSON、data URI 和 HTTP Basic 认证头中传递类二进制数据。
常见问题
Base64 是加密吗？
不是，它是编码而非加密。任何人都能解码，绝不能用它"保护"机密信息。
为什么编码后变长了？
每 3 个字节编码为 4 个字符，体积约增加 33%。
什么是 URL 安全的 Base64？
一种变体，把 + 和 / 换成 - 和 _ 并去掉填充符，使结果可以直接放进 URL 查询串而无需转义。