How to Encode a PNG Image to Base64 in JavaScript?

Base64 Encoding with JavaScript

Question:

Need assistance encoding a PNG image to a Base64 string using JavaScript. I know how to open files but am unfamiliar with binary data encoding.

Answer:

Utilizing btoa() and atob()

JavaScript offers the btoa() and atob() functions for converting from and to Base64 encoding.

btoa() Function

btoa() accepts a "string" representing an 8-bit byte array. Passing strings containing characters exceeding 8 bits may cause malfunction. If you're working with text, you'll need to encode it beforehand.

atob() Function

atob() returns a "string" with each character representing an 8-bit byte. This does not imply ASCII; it assumes binary data handling.

Additional Resources

• How to load binary image data using JavaScript and XMLHttpRequest?

Browser Support

Both btoa() and atob() have wide browser support. Consult the following links for specific compatibility information:

• https://caniuse.com/?search=atob
• https://caniuse.com/?search=btoa

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