What is Base64 encoding?

Base64 is an encoding scheme that converts binary data into ASCII text format using 64 different characters (A-Z, a-z, 0-9, +, /). It's commonly used to transmit binary data over text-based protocols like email or JSON APIs, or to embed images in HTML/CSS.

How do I encode a file to Base64 online?

To encode a file to Base64: 1) Switch to File mode, 2) Click the upload area or drag and drop your file, 3) The Base64 encoded string will appear instantly. You can then copy it to clipboard or use it in your code. For images, you'll see a preview of the uploaded file.

Is Base64 encoding secure?

No, Base64 encoding is NOT encryption and provides no security. It's simply a way to represent binary data as text. Anyone can easily decode Base64 strings. Never use Base64 encoding to protect sensitive information like passwords or API keys.

Can I decode a Base64 image?

Yes, our tool automatically detects Base64 encoded images and shows a preview when you decode them. Paste the Base64 string in Text mode, click Decode, and if it's an image, you'll see the preview immediately. You can also download the decoded image as a file.

Is this Base64 encoder free?

Yes, this Base64 encoder/decoder is completely free with no limitations. No registration required, no file size limits, and all processing happens in your browser for privacy and speed.

Base64编码器/解码器

将文本、图像、文件编码/解码为Base64格式

文本输入

输入要编码的文本...

结果

Base64 结果

提示

• 粘贴文本并点击编码即可转换为Base64

• 粘贴Base64字符串并点击解码即可转换回文本

• 拖放图像即可转换为Base64

• 使用Base64在HTML/CSS中嵌入图像