How to Encode a PNG Image to a Base64 String in JavaScript?

Base64 Encoding and Decoding in JavaScript

Question:

How can a PNG image be encoded to a Base64 string in JavaScript?

Answer:

JavaScript provides the btoa() and atob() functions for Base64 encoding and decoding.

Explanation:

Encoding to Base64:

• btoa() accepts a "string" representing 8-bit byte values.
• If the input string contains non-8-bit characters, encoding errors may occur.

Decoding from Base64:

• atob() returns a "string" with each character representing an 8-bit byte value.
• The result is not ASCII unless the input was already ASCII-encoded binary data.

Additional Notes:

• Older browsers may not support btoa() and atob(). Check using CanIUse: https://caniuse.com/?search=atob
• For more information on loading binary image data in JavaScript, refer to: https://stackoverflow.com/questions/9354592/how-do-i-load-binary-image-data-using-javascript-and-xmlhttprequest

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