What is Base64 encoding used for?

Base64 encoding converts binary data into ASCII text, commonly used for embedding images in HTML/CSS, transmitting data in JSON/XML, and encoding email attachments.

Is Base64 encoding the same as encryption?

No, Base64 is an encoding scheme, not encryption. It transforms data into a different format but does not provide security. Anyone can decode Base64 data without a key.

Can I encode files to Base64 with this tool?

This tool is designed for text-to-Base64 conversion. For file encoding, check our Image to Base64 tool which handles images specifically.

Does Base64 encoding increase data size?

Yes, Base64-encoded data is approximately 33% larger than the original binary data. Each group of 3 bytes is represented as 4 ASCII characters, so keep this overhead in mind for performance-sensitive applications.

Can this tool handle Unicode and non-ASCII characters?

Yes, the encoder correctly handles UTF-8 text including Unicode characters, emoji, and non-Latin scripts. The input is first converted to UTF-8 bytes before Base64 encoding to ensure accurate results.

Base64エンコーダー/デコーダー

テキストをBase64にエンコード、またはBase64をテキストにデコードします。

入力

使い方

テキストをBase64にエンコード、またはBase64をテキストにデコードします。

1Enter text to encode or Base64 string to decode.
2Select 'Encode' or 'Decode' mode.
3The result appears instantly as you type.
4Copy the output to use in your project.
5Use the encoded output in HTML data URIs, HTTP headers, or API payloads.

主な機能

Real-time encode and decode as you type
Supports UTF-8 text and special characters
Used for data URIs, API auth, and JWT tokens
No file size limits — works in your browser
Privacy-safe — all processing stays local, nothing is sent to a server

よくある質問

詳しく読む

Base64 Encoding Explained — What It Is and How to Use It