Base64 Encoder / Decoder

关于Base64 Encoder / Decoder

Base64 is a binary-to-text encoding scheme that represents binary data using a set of 64 printable ASCII characters. It was designed to allow binary data to be transmitted over channels that only reliably support text content. Base64 encoding is widely used in email attachments (MIME), embedding images directly in HTML and CSS as data URIs, storing complex data in JSON or XML, and encoding credentials in HTTP Basic Authentication headers. Each group of three bytes of binary data is encoded as four Base64 characters, making the output roughly 33% larger than the original. This tool supports full UTF-8 input, so you can encode any text including emoji and international characters without any issues. Decoding is equally straightforward — paste a Base64 string to immediately reveal the original content. Because all processing happens locally in your browser, your data never leaves your device, making it safe to use with sensitive information.

如何使用Base64 Encoder / Decoder

1. Select "Encode" to convert plain text to Base64, or "Decode" to reverse the process.
2. Type or paste your input text into the top textarea field.
3. The result appears instantly in the output field below — no button click needed.
4. Click the "Copy" button to copy the output to your clipboard.
5. To swap direction, click "Decode" — the current output will become the new input automatically.

常见问题