Encoding
Base64 Encode
Encode plain text into Base64.
Encoding
Base64 Decode
Decode a Base64 string back to plain text. Useful for inspecting JWT payloads, decoding values from HTTP headers, or reading data URLs.
工具摘要
此工具接收结构化输入，在浏览器中返回确定性输出，无需上传到服务器。
- 工具名称
- Base64 Decode
- 输入意图
- 提供需要转换、校验或分析的原始内容。
- 输出意图
- 获得可直接复制、复用或排错的规范化输出。
- 示例输入
- SGVsbG8sIHdvcmxk
- 示例输出
- Hello, world
Decoded text will appear here after you click Decode.
工具介绍
Decode a Base64 string back to plain text. Useful for inspecting JWT payloads, decoding values from HTTP headers, or reading data URLs.
工具概览
Base64 is a reversible encoding that maps every 3 bytes of input to 4 ASCII characters. This tool reverses that mapping and renders the result as UTF-8 text. If the input contains characters outside the Base64 alphabet, or the length is wrong, decoding fails and the tool reports "Invalid Base64".
使用场景
- Use Base64 Decode when you need fast decode base64 back to readable text.
- Handle encoding workflows directly in the browser with no install required.
- Support SEO long-tail intent by covering quick checks, troubleshooting, and one-off conversions.
输入/输出示例
输入意图
SGVsbG8sIHdvcmxk
输出意图
Hello, world
常见问题
What does "Invalid Base64" mean?+
The input contains characters outside the Base64 alphabet (A–Z, a–z, 0–9, +, /, =), or its length is not a multiple of four after padding.
Can it decode binary files?+
This tool decodes to UTF-8 text. Binary data (images, archives) will appear as gibberish; for those, use a desktop tool that writes the result to a file.
Does it support URL-safe Base64?+
It uses the standard alphabet. URL-safe Base64 replaces + with - and / with _ — convert those characters back before pasting.
探索更多工具
在下方的 Encoding 分类中发现相关工具。
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