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エンコーダー/デコーダー

テキスト、画像、ファイルをBase64にエンコード/デコード

テキスト入力

エンコードするテキストを入力...

結果

Base64 結果

ヒント

• テキストを貼り付けてエンコードをクリックするとBase64に変換されます

• Base64文字列を貼り付けてデコードをクリックするとテキストに変換されます

• 画像をドラッグ&ドロップするとBase64に変換されます

• Base64はHTML/CSSに画像を埋め込む際に使用されます