🔐開発
Base64エンコード/デコードツール
Encode any text to Base64 or decode Base64 back to plain text. Also supports URL encoding/decoding. Handles UTF-8 correctly. Includes Swap button, real-time validation, and copy-to-clipboard.
Examples:
0 chars
Common uses of Base64
Embedding images in HTML/CSS (data URIs), encoding API credentials, transmitting binary data in JSON, encoding email attachments (MIME), and storing binary data in databases or environment variables.
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How it works
This base64エンコード/デコードツール runs entirely in your browser — no data is sent to any server. Simply fill in the fields above and the result updates instantly. You can copy the output with the copy button provided.