Base64 Encoder & Decoder
Encode or decode Base64 instantly — no signup, 100% private, nothing ever leaves your browser.
Common Use Cases
Embed images in HTML/CSS
HTTP Basic Auth headers
JWT token payloads
Email attachments (MIME)
API binary data transfer
Data URI schemes
What Is Base64?
Base64 is a binary-to-text encoding scheme that represents binary data using a set of 64 printable ASCII characters. It is commonly used when binary data needs to be transmitted or stored in systems that only support text, such as email, HTML, or JSON.
How It Works
Every 3 bytes of binary data are converted into 4 Base64 characters. The result is approximately 33% larger than the original but is safe to transmit through any text-based protocol.
Base64 vs. Encryption
Base64 is encoding, not encryption. Anyone can decode it — it provides no security on its own. It is used purely for safe data transport, not for protecting sensitive information.