免费在线Base64编解码工具，支持UTF-8中文编码
Base64 is a binary-to-text encoding scheme that converts binary data into a set of 64 printable ASCII characters. It is widely used in email attachments (MIME), data URLs, HTTP Basic Authentication, JWT tokens, and embedding images in HTML/CSS. This free online tool lets you encode plain text or file content to Base64 and decode Base64 strings back to their original form — all processing happens locally in your browser for complete privacy.
Paste your text into the input box and click "Encode" to convert it to Base64, or paste a Base64 string and click "Decode" to recover the original content. The result appears instantly and can be copied with one click.
Base64 is a binary-to-text encoding scheme that represents binary data using 64 printable ASCII characters. It's commonly used for encoding data in email, URLs, and data transfer.
Yes, you can encode both text strings and file content to Base64, and decode Base64 back to the original content.
The tool works entirely in your browser, so the limit depends on your device's memory. For very large files (over 100MB), performance may vary.