🔐 Base64 编码/解码
🔒 安全 & 客户端处理
将文本编码或解码为 Base64。
How to use
- Type or paste text into the input box.
- Click Encode to convert text to Base64, or Decode to reverse it.
- Multi-byte characters (emoji, CJK) are handled correctly via
TextEncoder/TextDecoder. - Click Copy to send the result to your clipboard.
Base64 is commonly used in HTTP Basic Auth headers, Data URIs (data:image/png;base64,...), email attachments (MIME), and JWT segments. It is encoding, not encryption — anyone can decode it.
Examples
UTF-8 round-trip:
Encode: "Hello 🌍" → SGVsbG8g8J+MjQ==
Decode: SGVsbG8g8J+MjQ== → "Hello 🌍"Decoding a JWT payload:
eyJzdWIiOiIxMjMiLCJuYW1lIjoiQWRhIn0
→ {"sub":"123","name":"Ada"}