What is Base64 Encoding and When Should You Use It?

If you've worked with APIs, email attachments, or authentication tokens, you've definitely encountered Base64 — even if you didn't know it.

What Is Base64?

Base64 is a way to encode binary data into ASCII text. It takes any data (images, files, binary) and converts it into a string made of 64 printable characters: A–Z, a–z, 0–9, +, and /.

Why Is It Used?

Many systems (email, XML, JSON) are designed to handle text only. Base64 lets you safely embed binary data inside text formats.

Common Use Cases

Embedding images in HTML/CSS: src="data:image/png;base64,..."
JWT tokens: The header and payload are Base64-encoded.
API authentication: HTTP Basic Auth sends credentials as Base64.
Email attachments: Files are Base64-encoded inside MIME messages.

Is Base64 Encryption?

No! Base64 is encoding, not encryption. Anyone can decode it. Never use Base64 to hide sensitive data — use proper encryption like AES instead.

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