Base64 Encoder / Decoder

What is Base64 Encoder / Decoder?

Base64 encoding converts binary data into an ASCII string using 64 printable characters. It is widely used when binary data needs to be stored and transferred over media designed for text — such as embedding images in CSS, passing tokens in HTTP headers, or encoding email attachments.

How to use Base64 Encoder / Decoder

Select Encode or Decode mode, paste your input, and click the action button. For encoding, any UTF-8 text is accepted. For decoding, provide a valid Base64 string.

Example

// Plain text → Base64
Hello, World!  →  SGVsbG8sIFdvcmxkIQ==

// Base64 → Plain text
U0VDUkVU  →  SECRET

Common use cases

1. Encoding binary data for JSON APIs.

2. Embedding small images as data URIs in CSS/HTML.

3. Passing credentials in HTTP Basic Auth headers.

4. Decoding JWT token payloads for inspection.

Frequently asked questions