Base64编码/解码
文本与 Base64 互转，另支持文件转 Base64。
关于「Base64编码/解码」
它属于「编码加密」分类：常见编码、哈希与转义，全部在本地计算。
- 把文本编码为 Base64 或反向解码，采用 UTF-8 安全方案，中文不会乱码。
- 勾选「URL 安全」会把 + / = 替换为 - _ 并无填充，常用于 token、URL 参数。
- 处理在本地完成，内容不会上传。
完全免费、无需注册；所有处理都在浏览器本地完成，文件不会上传到任何服务器。
相关关键词：Base64编码/解码、编码加密、base64、编码、解码、在线工具、免费
如何使用「Base64编码/解码」
- 打开工具：打开「Base64编码/解码」页面，无需注册、无需安装任何软件。
- 准备输入：准备好要处理的内容或文件：文本可直接粘贴，文件可拖入页面（本工具属于「编码加密」）。
- 填入内容：把内容粘贴进输入框，或把文件拖入页面；也可以点击「示例」先填入样例数据试一下。
- 设置选项并处理：按需调整页面上的选项，然后点击处理 / 转换 / 生成按钮。
- 获取结果：处理完全在浏览器本地完成，结果可直接复制或下载，文件不会上传到任何服务器。
常见问题
- 为什么 Base64 比原文长？
- Base64 每 3 字节编码为 4 字符，体积约膨胀 33%，是编码特性。
- 解码出现乱码？
- 可能是源不是标准 Base64，或含换行/URL 字符未切换模式；试试勾选 URL 安全再解。
Base64 Encode/Decode (English)
Convert text to/from Base64, plus file to Base64.
Belongs to “Encoding & Crypto”: Common encodings, hashes and escaping — all computed locally.
- Encodes text to Base64 or decodes it back, using a UTF-8-safe scheme so Chinese never garbles.
- Check “URL-safe” to swap + / = for - _ with no padding — common for tokens and URL params.
- Processing is done locally; nothing is uploaded.
Free, no sign-up; everything runs locally in your browser and files are never uploaded.
Keywords: Base64 Encode/Decode, Encoding & Crypto, base64, encode, decode, online tool, free
How to use it
- Open the tool：Open the “Base64 Encode/Decode” page — no sign-up and nothing to install.
- Prepare the input：Prepare the content or file to process: paste text or drop a file onto the page (this tool belongs to “Encoding & Crypto”).
- Provide the input：Paste your content into the input box or drop a file onto the page; you can also click “Sample” to try example data first.
- Adjust options and run：Adjust the options if needed, then click the process / convert / generate button.
- Get the result：Everything runs locally in your browser; copy or download the result — your files are never uploaded.
FAQ
- Why is Base64 longer than the original?
- Base64 encodes 3 bytes into 4 chars, growing size ~33% — an inherent property of the encoding.
- Decode shows garbage?
- The source may not be standard Base64, or has newlines/URL chars without the right mode; try URL-safe and decode again.
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