Question 1

What is Base64 encoding?

Accepted Answer

Base64 is a binary-to-text encoding scheme that converts binary data into a string of ASCII characters. It uses 64 printable characters (A-Z, a-z, 0-9, +, /) to represent any binary data. It's commonly used to encode data for transmission in environments that only support text, such as email, JSON, or HTML data URLs.

Question 2

When should I use Base64 encoding?

Accepted Answer

Common use cases: embedding images in HTML/CSS as data URIs (data:image/png;base64,...), encoding binary data in JSON, passing binary data in URLs, storing binary data in databases as text, and transmitting attachments in email (MIME). Base64 is not encryption — it's an encoding scheme and is fully reversible.

Question 3

Does Base64 increase file size?

Accepted Answer

Yes — Base64 encoding increases size by approximately 33%. Every 3 bytes of binary data becomes 4 Base64 characters. This overhead is the trade-off for making binary data safe to transmit as text. For large files, consider using binary transfer methods instead.

Question 4

Is Base64 the same as encryption?

Accepted Answer

No — Base64 is encoding, not encryption. Anyone can decode a Base64 string instantly without a key. Do not use Base64 to hide sensitive data. Use proper encryption (AES, RSA) for security. Base64 only makes binary data safe for text-based transport.

Base64 Encoder & Decoder

What is Base64?

Common use cases