Base64エンコーダー・デコーダー
Base64文字列をオンラインでエンコード・デコードします。テキストをBase64に変換し、その逆も瞬時に行います。
エンコードするテキスト
機能紹介
The Base64 Encoder & Decoder tool converts text and binary data to and from Base64 format in your browser. It is useful for embedding small assets, handling authorization headers, and debugging encoded payloads.
このツールを使うタイミング
Use this tool whenever you need to encode or decode Base64: working with data URIs, HTTP headers, simple obfuscation, or debugging APIs that return Base64-encoded content.
使い方
Choose encode or decode
Select whether you want to convert plain text to Base64 or decode an existing Base64 string.
Paste your input
Paste the text or Base64 string into the input box. For binary data, paste the Base64 representation you received from another system.
Run the conversion
Click the appropriate button to instantly see the encoded or decoded result in the output area.
Copy the result
Copy the converted value into your code, configuration, or debugging tool as needed.
使用例
Decoding an HTTP Authorization header
When debugging Basic Auth issues, paste the Base64 part of the Authorization header to see the original username and password pair.
Creating a simple data URI
Encode small text or assets into Base64 so they can be embedded directly in HTML or CSS as data URIs.