What is a Base64 data URL used for?

Base64 data URLs let you embed images directly inside HTML or CSS without a separate file request.

Does encoding increase file size?

Yes, Base64 encoding increases size by roughly 33% compared to the original binary file.

Is my image uploaded anywhere?

No, encoding and decoding both happen locally in your browser using the FileReader API.

How much bigger does a Base64-encoded image get?

Roughly 33% larger than the original binary file, since Base64 encodes every 3 bytes as 4 characters.

What's the difference between the raw Base64 string and a data URL?

A data URL adds a prefix such as data:image/png;base64, that tells the browser the file type, so it can be used directly as an image source. Raw Base64 is only the encoded characters. Choose either output format in the tool.

Can I decode a Base64 string back into a downloadable image file?

Yes. Paste the Base64 or data URL on the decode tab; the real file type is detected from the data, a preview is shown, and you can download it with the right extension.

Why would I embed an image as Base64 instead of linking to a file?

Embedding avoids a separate network request, which is useful for small icons in CSS/HTML or inline email images, though it increases the size of the containing file.

Can it give me an tag or CSS?

Yes. Choose tag, CSS background or Markdown to copy a ready-to-paste snippet that already includes the data URI and, for , the image's width and height.

Processed 100% locally in your browser

Base64 Image Encoder

Turn images into Base64 data URIs and ready-to-paste snippets, or decode Base64 back to an image — entirely in your browser.

Quick Answer

Base64 Image Encoder lets you: Turn images into Base64 data URIs and ready-to-paste snippets, or decode Base64 back to an image — entirely in your browser. To start, switch between encoding an image or decoding a Base64 string.

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How to use this tool

1
Choose a mode
Switch between encoding an image or decoding a Base64 string.
2
Upload or paste
Upload an image file, or paste a Base64 string / data URL.
3
View the result
See the generated Base64 string or decoded image preview instantly.
4
Copy or download
Copy the Base64 output, or download the decoded image.

Frequently Asked Questions

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Base64 Image Encoder

How to use this tool

Choose a mode

Upload or paste

View the result

Copy or download

Frequently Asked Questions

What is a Base64 data URL used for?

Does encoding increase file size?

Is my image uploaded anywhere?

How much bigger does a Base64-encoded image get?

What's the difference between the raw Base64 string and a data URL?

Can I decode a Base64 string back into a downloadable image file?

Why would I embed an image as Base64 instead of linking to a file?

Can it give me an <img> tag or CSS?

Related Tools

QR Code Generator

JSON Formatter

Base64 Image Encoder

How to use this tool

Choose a mode

Upload or paste

View the result

Copy or download

Frequently Asked Questions

What is a Base64 data URL used for?

Does encoding increase file size?

Is my image uploaded anywhere?

How much bigger does a Base64-encoded image get?

What's the difference between the raw Base64 string and a data URL?

Can I decode a Base64 string back into a downloadable image file?

Why would I embed an image as Base64 instead of linking to a file?

Can it give me an <img> tag or CSS?

Related Tools

QR Code Generator

JSON Formatter