About Base64

What is it?

Base64 is a binary-to-text encoding scheme that represents binary data (like images or files) in a printable ASCII string format. It’s not a form of encryption, but rather a way to ensure data remains intact without modification during transport through text-based channels.

Why is it necessary?

Many communication protocols (like email’s SMTP) were originally designed to handle only text. Sending raw binary data through these systems could corrupt it, as certain byte values might be misinterpreted as control characters. Base64 encodes the data into a “safe” set of 64 ASCII characters that all systems can handle correctly.

Common Applications & Uses

• Data URLs: Embedding images or other files directly into HTML or CSS (e.g., `src=”data:image/png;base64,…”`). This reduces HTTP requests.
• Email Attachments: It’s a core part of the MIME standard for sending files in emails.
• Storing Binary in Text: Saving binary data in text-based formats like XML or JSON where raw binary isn’t allowed.
• Basic Obfuscation: Hiding data from casual observation. It’s easily reversible and provides no real security, but can prevent automated systems from reading content.

Encode to Base64

Encode

Decode from Base64

Decode

ASCII Table (Printable)

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