Image to Base64 Converter

Convert an image to a Base64 string or data URI right in your browser.

ToolsSoup's Image to Base64 Converter is a free online tool that encodes any image into a Base64 string or data URI directly in your browser. Upload a PNG, JPG, GIF, SVG, or WebP and instantly get a ready-to-paste data URI, a raw Base64 string, an HTML tag, or a CSS background-image rule. Everything runs locally on your device — no uploads, no sign-up, and your images never leave your computer.

What is a Base64 image?

Base64 is a way of representing binary data, such as an image, using only printable text characters. A Base64 image is the raw bytes of an image file re-encoded into that text form, usually wrapped in a data URI like data:image/png;base64,iVBORw0KGgo… Because it is plain text, you can embed an image directly inside HTML, CSS, JSON, or a JavaScript file instead of linking to a separate image file. This tool reads your image with the browser's FileReader and produces the Base64 string for you.

How to convert an image to Base64

Encoding an image to Base64 with ToolsSoup takes just a few seconds:

  1. Click Choose an image and select the file you want to encode.
  2. See the preview, file name, original size, and resulting Base64 size.
  3. Pick an output format: a data URI, raw Base64, an HTML tag, or a CSS background-image rule.
  4. Click Copy to copy the result and paste it straight into your code.

When should you use a Base64 data URI?

Inlining an image as a Base64 data URI removes a separate network request, which can speed up the loading of very small images such as icons, logos, and tiny background patterns. It is also handy for embedding images in self-contained HTML emails, single-file documents, JSON payloads, or CSS. Keep in mind that Base64 makes the data roughly 33% larger than the original file and the inlined image cannot be cached separately, so it is best reserved for small images rather than large photos.

Why use this Image to Base64 converter?

  • 100% free with no ads, watermarks, sign-up, or usage limits.
  • Runs entirely in your browser — your images are never uploaded to a server.
  • Works with PNG, JPG, GIF, SVG, WebP, and other common image formats.
  • Outputs a data URI, raw Base64, an HTML tag, or a CSS background-image rule.
  • Shows the original file size and the resulting Base64 size, with one-click copy.

Frequently asked questions

Is this Image to Base64 converter free?

Yes. Every tool on ToolsSoup is completely free to use, with no account, sign-up, watermarks, or hidden limits.

Are my images uploaded to a server?

No. The encoding happens locally in your browser using the FileReader API, so your images are never uploaded, stored, or seen by anyone but you.

What is a data URI?

A data URI is a string that begins with data: and contains the file's MIME type and Base64-encoded contents, like data:image/png;base64,…. You can use it anywhere a URL is expected, such as the src of an tag or the url() in a CSS background, to embed the image inline.

Why is the Base64 string larger than my image?

Base64 represents every three bytes of binary data with four text characters, so the encoded output is roughly 33% larger than the original file. That is the trade-off for being able to store the image as plain text.

Which image formats are supported?

The tool can encode any image your browser can read, including PNG, JPG/JPEG, GIF, SVG, WebP, BMP, and ICO. The data URI keeps the original format's MIME type.

Should I inline large images as Base64?

Usually not. Base64 inlining works best for small images like icons and logos. Large images become very long strings, cannot be cached separately by the browser, and can slow down the page they are embedded in, so linking to the file is normally better.