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Image to Base64

Convert images to Base64 encoded strings for use in CSS, HTML, or data URIs

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Optimizing Assets with Base64

Base64 encoding allows you to embed image data directly into your HTML, CSS, or JSON files as text. This eliminates the need for a separate HTTP request to fetch the image file.

A black and white cartoon of a photograph being fed into a machine and coming out as a long stream of 1s and 0s.A black and white cartoon of a photograph being fed into a machine and coming out as a long stream of 1s and 0s.

Pros & Cons

Advantages

  • Fewer HTTP Requests: Speeds up page load by reducing the number of round-trips to the server.
  • Single File: Easy to share or store as everything is contained in one text string.

Disadvantages

  • Larger Size: Base64 strings are roughly 33% larger than the original binary file.
  • No Caching: The image cannot be cached separately by the browser; it reloads every time the HTML/CSS reloads.

How It Works

Base64 encoding takes binary data (like an image) and translates it into a set of 64 ASCII characters (A-Z, a-z, 0-9, +, /). This ensures the data remains intact during transport over protocols that are designed to handle text.

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==
A black and white cartoon of a web browser loading a page instantly because the assets are embedded within the code.A black and white cartoon of a web browser loading a page instantly because the assets are embedded within the code.

Learn More

Read more about Data URLs and when to use them.

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