Base64 shows up everywhere once you start looking: embedded images in CSS, authentication tokens, email attachments, API payloads. It is not encryption, and it is not compression. It is simply a way to represent binary data using only printable ASCII characters, so it can travel safely through systems that only understand text.

A Common Misunderstanding

Base64 is not a security measure. Anyone can decode a Base64 string instantly, there is no key and no secret involved. If you see an API token or password stored as Base64, treat it as plain text, because functionally it is. Use real encryption or hashing for anything sensitive.

Common Use Cases

Embedding small images directly into CSS or HTML as data URIs

Encoding binary attachments for transmission in JSON or XML payloads

Storing simple credentials in HTTP Basic Authentication headers

Passing data safely through systems that may not handle special characters

Encode and Decode Without Leaving Your Browser

Our Base64 Encoder / Decoder runs entirely client-side, so nothing you type is sent to a server. It also handles full Unicode text correctly, including non-Latin characters, which trips up many simple Base64 tools that only support ASCII. Type or paste text, click Encode, and copy the result. Paste Base64 back in and click Decode to reverse it instantly.

Try the Base64 Encoder / Decoder now and see it handle both directions instantly.