How to reuse base64 image repeatedly in HTML file

I have an HTML file that will be portable to distribute to clients. It has an index of documents. I want a PDF or Word icon for each document but I don't want to repeat the base64 string 30 times if I can avoid it. How should I do this? Javascript is okay, but my goals are simplicity and portability.

The other answer using CSS gives the right idea, but it is not compatible with all browsers. The content property of the CSS is only allowed in the pseudo-elements ::before and ::after. The img tag with a class with a content property is empty. The browsers have no obligation to display it. Chrome displays it nevertheless (incorrectly).

To make this work for all browsers, use for example the ::before on an empty span:

span.word-icon::before {
  content: url(data:image/gif;base64,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);
}
<html>
  <body>  
    <p><span class="word-icon"></span>Paragraph with icon.</p>
  </body>
</html>

Data URIs, You can embed the image data directly into the document with data URIs. Did you know that you don't have to link to an external image file when using an <img > element in HTML, no-repeat left center; padding: 5px 0 5px 25px; } Also note that base64 isn't the only possible format for a data URI and� To retrieve an image from a base64 text, you need to follow rules of HTML. It is very easy to show the image from base64 encoded text in HTML. Suppose, the base64 code for your image is iVBORw0KGgoAAAANSUhEUgAAAAoAAAAJCAIAAACExCpEAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAASSURBVChTY5DutMGDRqZ0pw0A4ZNOwQNf and you want to display the image in your HTML page using HTML code. The HTML code syntax to show an image from base64 binary code will be like below: <img src

Try using CSS class

img.word-icon {
  content: url(data:image/gif;base64,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);
  width: 32px;  
  height: 32px;
}
<html>
  <body>  
    <img class="word-icon">foo
    <img class="word-icon">bar
    <img class="word-icon">
  </body>
</html>

Reusing Base 64 code for the same image multiple times so that the , However, the output HTML size increases in this process. I think that Reusing Base 64 code for the same image multiple times so that the output size does not increase js file, all of my images will get converted to base64 ? First convert your image to Base64 (encode to Base64). You can do it online or with a PHP script. After converting you will get the result as

create a script to insert it into the images. I purposely put the script code inline since you're sending a single HTML file:

<img alt="pdf"/>
<img alt="pdf"/>
<img alt="pdf"/>
<img alt="pdf"/>
<img alt="pdf"/>
<img alt="pdf"/>
<script>
  var images = document.getElementsByTagName('img');
for (var i = 0; i < images.length; i++){
  images[i].src = "data:image/png;base64,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";
}
</script>

Content Images in Modern HTML Emails, Have you ever struggled with making the content images of HTML blocking, and; examine GIF and Base64 encoded image support. We will end up with a quality, reusable code block as our image I used a 1600x1200 pixels, high- resolution, JPG format image, which file type is often considered the� 11 How to reuse base64 image repeatedly in HTML file Jun 24 '16. 6 Install electron on node for windows hangs Dec 6 '16.

You can use a CSS variable.

In the <head> section of the page, name and define the variable and a class to use it:

:root {
    --img-123: url(data:null;base64,iVBORw………); /* your image data here */
}

.img-123 {
    background-blend-mode: normal;
    background-clip: content-box;
    background-position: 50% 50%;
    background-color: rgba(0,0,0,0);
    background-image:var(--img-123);
    background-size: 100% 100%;
    background-origin: content-box;
    background-repeat: no-repeat;
}

In the <body> section of the page, use the image repeatedly via element style section or CSS classes. The SVG data creates a transparent image through which to see the content.

<img 
  class="img-123" 
  src="data:image/svg+xml,&lt;svg xmlns=&quot;http://www.w3.org/2000/svg&quot; width=&quot;16&quot; height=&quot;16&quot;&gt;&lt;rect fill-opacity=&quot;0&quot;/&gt;&lt;/svg&gt;"
>

I observed this technique in the output of the open source Firefox / Chrome extension SingleFile. There might be ways to simplify the CSS and to avoid using SVG.

How to Display Base64 Images in HTML, This can help to increase the page load time for smaller images by saving the browser from making additional HTTP requests. Base64 encoding and Data URL go� A 2k image file will result in 2.5 or 3k of base64 encoded data. However, if you are enabling compression (as you should be) it will end up at about the same size as the image file. I would not recommend you use base64 encoding for an image larger than 5k. How base64 is used. Example: Here is a typical image file in your html:

Images | Web Fundamentals, A picture is worth 1000 words, and images play an integral part of every page Raster images might come from a camera or scanner, or be created with the HTML file, such as an image, inline by setting the src of an img element as a Base64 making it easy to add multiple images, and causing them to repeat, and more. The first solution that you may implement and probably the only idea that will occur to everybody, when you need to upload a Base64 image into the server, is to upload this file as a string and then convert it to a file in the server side. This implementation works like a charm, however there's another implementation that you may want to know

Inline Images with Data URLs, Learn how to embed images into your web pages with data URLs. Embedded in XHTML files, data URL images are not cached for repeated use, nor You must recalculate the base64 data and edit the CSS file every time the image changes. Folder Icons Embedded in HTML � Folder Icons using CSS� Storing images. The idea here is to be able to take an image that has been loaded into the current web page and store it into localStorage. As we established above, localStorage only supports strings, so what we need to do here is turn the image into a Data URL. One way to do this for an image, is to load into a canvas element.

20 Tips for Optimizing CSS Performance, Use image tools to reduce file sizes by striping metadata and Multiple <link> tags within the HTML will load CSS files in parallel, which is This can be ideal for smaller, reusable icons and avoids additional HTTP requests. Standard bitmap JPGs, PNGs and GIFs can be encoded to a base64 string� What's the best way to embed SVGs in HTML 5? How does embedding SVGs using Img tags, Object tags, Inline SVG differs among each other in terms of browser support, alt and title attributes, browser caching, compression, interactivity, search engine indexing and workflow.

Comments
  • Oh now this is brilliant. I hadn't thought of CSS. Thanks!
  • This is the right idea. Added a solution compatible with most browsers: stackoverflow.com/a/44710590/1667977
  • The application is the difficulty. I could do it in JQuery but I don't want any libraries or separate files.
  • Updated my answer @Devil'sAdvocate. Just another approach.
  • This is what I was expecting, thanks for the update. But I prefer the CSS solution.
  • I've heard from different sources that using 'content' in CSS is bad since it separates the purposes of CSS, HTML and Javascript. CSS is supposed to be for presentation only, HTML for content, and Javascript for interactivity or DOM manipulation. Honestly, I don't think it really matters in your specific case, and i'm not an expert, just what the general consensus in the programming community is from what I've read: karlgroves.com/2013/08/26/css-generated-content-is-not-content
  • I respect that argument but I was never a fan. Of course I also mix my food on my plate.
  • I'm the author of SingleFile. The purpose of the SVG in SingleFile is to give a size to the image without altering the CSS. So, I confirm you can avoid SVG if setting the width and the height of the image with CSS is not an issue for you.