Base64 Explained Like You're Not A Robot
Base64 sounds scary until you realize it’s basically
just a weird way computers hide text inside safe characters.
In this article
What Is Base64? Why Developers Use It Base64 Inside JWT Tokens Common Beginner MistakesWhat Is Base64?
Imagine sending a photo through a system that only accepts text.
Base64 converts binary data into plain text characters.
Think of Base64 like putting a package inside another box
so delivery systems stop complaining.
Example:
Hello World
↓
SGVsbG8gV29ybGQ=That weird text is just encoded data. Not encryption. Not security. Just conversion.
Why Developers Use It
- sending images in APIs
- embedding files in HTML/CSS
- JWT tokens
- email attachments
- avoiding broken special characters
Computers love predictable text. Base64 gives them exactly that.
Base64 Inside JWT Tokens
JWT tokens use Base64URL encoding.
xxxxx.yyyyy.zzzzzEach part contains Base64-encoded data.
Which is why developers paste JWTs into decoders all day 😄
Common Beginner Mistakes
Biggest mistake:
thinking Base64 is encryption.
Anyone can decode Base64 instantly.
If you put passwords or secrets inside Base64, congratulations — you invented transparent security.