Base64 Encode / Decode
Encode or decode Base64 text locally.
How to use
- 文本编码：输入任意文本（含中文、emoji），输出 Base64。
- 文本解码：粘贴 Base64 还原为文本，自动处理 UTF-8 字节。
- 支持 Data URL（data:...;base64,xxx）的编解码。
- 解码失败时提示原因（如非法字符或长度错误），不会输出乱码。
FAQ
Does Base64 Encode / Decode upload my data?
No. Processing stays in your browser and is not uploaded.
Do I need an account?
No. Open and use — no signup.
How is this different from upload-based tools?
Tools run locally in your browser; content is not sent to our servers for processing.
Are there limits?
Limited by device memory and the browser; very large inputs may slow the page.