Image to Base64 Encoder — Free & Instant

Convert any image to a Base64 data URI for embedding in code.

How It Works

  1. 1Upload your image by dragging it into the drop zone or clicking to browse.
  2. 2The Base64 string and data URL are generated automatically.
  3. 3Copy the result and paste it directly into your CSS, HTML, or JSON.

About Image to Base64

Need to embed an image directly in your HTML, CSS, or JSON without a separate file? Base64 encoding converts binary image data into a text string that can be included inline in your code, eliminating the need for a separate HTTP request to load the image. This tool converts any image to a Base64-encoded data URI that you can paste directly into your source code. The output includes the full data:image/... prefix ready for use in img tags, CSS background-image properties, or JSON payloads. This is particularly useful for embedding small icons, logos, and UI elements directly in HTML emails (where external images are often blocked), single-file HTML documents, CSS stylesheets, and API responses that include image data. Copy the entire data URI to your clipboard with one click. The tool also shows the encoded string length so you can gauge the impact on your file size — keep in mind that Base64 encoding increases the data size by roughly 33%. Supports JPG, PNG, WebP, GIF, SVG, BMP, and AVIF formats.

From the blog

Frequently Asked Questions

What is Base64 encoding?

Base64 is a way to represent binary data (like images) as a text string. This allows you to embed images directly in HTML, CSS, or JSON without needing a separate file. It's commonly used for small icons, logos, and email templates.

When should I use Base64 images?

Base64 is ideal for very small images (under 10 KB) like icons and logos. For larger images, it's better to use regular image files because Base64 increases the data size by about 33%.

What's the difference between Data URI and Raw Base64?

A Data URI includes the MIME type prefix (e.g., data:image/png;base64,...) and can be used directly in HTML <img> tags. Raw Base64 is just the encoded string without the prefix.

Is my file uploaded to a server?

No. Transmute processes everything locally in your browser using JavaScript and the Canvas API. Your files never leave your device — there is no server, no upload, no cloud processing.

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