输入
输入要编码的文本
0 个字符
选项
URL 安全模式将 + 替换为 -，将 / 替换为 _，以便在 URL 中安全使用。
输出
Base64 编码结果
0 个字符
关于此工具
Base64 编码器/解码器 已本地化为简体中文。可用于验证、转换、检查和导出结果，无需把数据上传到服务器。
使用方法
Base64 编码器/解码器 已本地化为简体中文。可用于验证、转换、检查和导出结果，无需把数据上传到服务器。
限制与重要说明
Base64 编码器/解码器 已本地化为简体中文。可用于验证、转换、检查和导出结果，无需把数据上传到服务器。
Technical Details
Edge Cases & Tricky Inputs
- •UTF-8 multi-byte characters (emoji, CJK) are encoded correctly — each byte is mapped independently.
- •URL-safe Base64 replaces + with - and / with _ to avoid URL encoding issues.
- •Padding characters (=) can be omitted in some implementations but are included by default here.
Performance & Processing
- •Encoding/decoding runs via the browser's built-in btoa()/atob() for ASCII, with a TextEncoder fallback for UTF-8.
- •Files up to 5 MB can be encoded without issues on modern browsers.
Developer Notes
- •Base64 increases data size by approximately 33% — consider this for bandwidth-sensitive applications.
- •Data URIs using Base64 are supported in all modern browsers for images, fonts, and CSS.
Known Limitations
- •Not encryption — Base64 is trivially reversible and provides zero security.
- •Very large files may cause browser memory pressure during encoding.
Related Tool Collections
Encoding & Decoding
Encode, decode, and transform text between formats — Base64, URL encoding, HTML entities, and more.
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