What Is Base64 Encoding? A Simple Guide for Developers

Base64 is a way to represent binary data (like images or files) using only plain text characters. It's everywhere in web development.

Why Base64 exists

Some systems — email, URLs, JSON — only reliably handle text. Base64 converts binary data into a safe text string so it can travel through those systems without being corrupted.

Where you'll see it

• Embedding images directly in HTML/CSS as data: URIs
• Encoding tokens and API credentials
• Email attachments (MIME)

One thing to remember

Base64 is encoding, not encryption — anyone can decode it. Never use it to "hide" secrets.

Try our Base64 Encoder / Decoder to convert text both ways in your browser. Working with tokens? See the JWT Decoder too.