What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It is commonly used to embed small images, fonts, or other files directly into HTML or CSS, avoiding extra HTTP requests. It increases file size by about 33% compared to the original binary.
The "Speed vs. Size" Trade-off
I often see developers Base64-encoding 1MB images. Don’t do this. Base64 makes files larger. The only time I use it is for tiny icons (under 2KB) where the overhead of a new HTTP request is more expensive than the extra 33% in file size. For anything larger, stick to external files.
Is it Secure?
No. Base64 is easily reversible. Anyone with a terminal can decode it in half a second. Never use it to "hide" passwords or sensitive data. It’s for transmission, not protection.
Frequently Asked Questions
Why is it called Base64?
Because it uses 64 characters to represent data: A-Z, a-z, 0-9, and two symbols (usually + and /).
