What is Base64?

Base64 is a text encoding scheme that represents binary data in ASCII string format. It uses 64 printable characters to make binary content safe for text-only systems.

Common Use Cases

Base64 is common in API payloads, embedded images, email attachments, HTTP headers, JSON responses, database exports, and other places where binary data must travel as plain text.

Data URL Format

The decoder detects data:[mediatype];base64,[encoded-data] and extracts the MIME type before decoding the payload.

How the Decoder Works

Paste any base64 text into the input field and the page decodes it instantly in your browser. Invalid input is marked without sending data to a server.

Security Considerations

Base64 is not encryption. Anyone can decode it, so sensitive data should be protected with HTTPS, encryption, and normal access controls.