When converted to base64, the background image (image/svg+xml) mysteriously disappears

Below is a Checkbox SVG that I have added to my tables;

.check-nobase64 {
  background-image: url("data:image/svg+xml,%3Csvg width='42' height='42' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath fill-rule='evenodd' clip-rule='evenodd' d='M-.001 21c0-11.598 9.402-21 21-21s21 9.402 21 21-9.402 21-21 21-21-9.402-21-21zM19.8 29.99l12.092-15.115-2.186-1.75L19.398 26.01l-7.303-6.086-1.792 2.151L19.8 29.99z' fill='%231675BB'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-size: cover;
  width: 28px;
  height: 28px;
  margin: 0 auto;
}
<div class="check-nobase64"></div>

Enabling Cloudflare caching automatically converts it to base64 and breaks the SVG code;

.check-base64 {
  background-image: url(data:image/svg+xml;base64,PHN2Z1wgd2lkdGg9XCc0MlwnXCBoZWlnaHQ9XCc0MlwnXCBmaWxsPVwnbm9uZVwnXCB4bWxucz1cJ2h0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnXCc+PHBhdGhcIGZpbGwtcnVsZT1cJ2V2ZW5vZGRcJ1wgY2xpcC1ydWxlPVwnZXZlbm9kZFwnXCBkPVwnTS0uMDAxXCAyMWMwLTExLjU5OFwgOS40MDItMjFcIDIxLTIxczIxXCA5LjQwMlwgMjFcIDIxLTkuNDAyXCAyMS0yMVwgMjEtMjEtOS40MDItMjEtMjF6TTE5LjhcIDI5Ljk5bDEyLjA5Mi0xNS4xMTUtMi4xODYtMS43NUwxOS4zOThcIDI2LjAxbC03LjMwMy02LjA4Ni0xLjc5MlwgMi4xNTFMMTkuOFwgMjkuOTl6XCdcIGZpbGw9XCcjMTY3NUJCXCcvPjwvc3ZnPg==);
  background-repeat: no-repeat;
  background-size: cover;
  width: 28px;
  height: 28px;
  margin: 0 auto;
}
<div class="check-base64">

Decoding the base64 encoding reveals the original SVG data as seen below;

%3Csvg width='42' height='42' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath fill-rule='evenodd' clip-rule='evenodd' d='M-.001 21c0-11.598 9.402-21 21-21s21 9.402 21 21-9.402 21-21 21-21-9.402-21-21zM19.8 29.99l12.092-15.115-2.186-1.75L19.398 26.01l-7.303-6.086-1.792 2.151L19.8 29.99z' fill='%231675BB'/%3E%3C/svg%3E"

This information shows that when Cloudflare converts the SVG to base64, the URL Encoding section gets distorted. Any suggestions on resolving this issue would be greatly appreciated.

Edit: The main problem seems to be the # symbol in the fill part of the SVG. Manually converting # to %23 allows the decoded base64 to display correctly.

htmlcss

Answer №1

Make sure to change your SVG file into base64 format, treating it as a standard SVG file source. Using \' incorrectly will lead to encoding errors.

The proper Base64 conversion should look like this:

<svg width="42" height="42" fill="none" xmlns="http://www.w3.org/2000/svg"><path fill-rule="evenodd" clip-rule="evenodd" d="M-.001 21c0-11.598 9.402-21 21-21s21 9.402 21 21-9.402 21-21 21-21-9.402-21-21zM19.8 29.99l12.092-15.115-2.186-1.75L19.398 26.01l-7.303-6.086-1.792 2.151L19.8 29.99z" fill="#1675BB"/></svg>

Avoid converting the SVG in this way:

<svg\ width=\'42\'\ height=\'42\'\ fill=\'none\'\ xmlns=\'http://www.w3.org/2000/svg\'><path\ fill-rule=\'evenodd\'\ clip-rule=\'evenodd\'\ d=\'M-.001\ 21c0-11.598\ 9.402-21\ 21-21s21\ 9.402\ 21\ 21-9.402\ 21-21\ 21-21-9.402-21-21zM19.8\ 29.99l12.092-15.115-2.186-1.75L19.398\ 26.01l-7.303-6.086-1.792\ 2.151L19.8\ 29.99z\'\ fill=\'#1675BB\'/></svg>

.check-base64,
.check-nobase64 {
  background-repeat: no-repeat;
  background-size: cover;
  width: 28px;
  height: 28px;
  margin: 0 auto;
}

.check-nobase64 {
  background-image: url("data:image/svg+xml,%3Csvg width='42' height='42' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath fill-rule='evenodd' clip-rule='evenodd' d='M-.001 21c0-11.598 9.402-21 21-21s21 9.402 21 21-9.402 21-21 21-21-9.402-21-21zM19.8 29.99l12.092-15.115-2.186-1.75L19.398 26.01l-7.303-6.086-1.792 2.151L19.8 29.99z' fill='%231675BB'/%3E%3C/svg%3E");
}

.check-base64 {
  background-image: url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIGZpbGw9Im5vbmUiIHZpZXdCb3g9IjAg...etc
}
(wrapper styling and code snippets remain as before)

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