Question 1

What is a Base64 image?

Accepted Answer

Base64 is an encoding scheme that represents binary data — such as an image — as a string of ASCII characters. A Base64-encoded image can be embedded directly in HTML, CSS or JSON without needing a separate file, using a data URI like data:image/png;base64,...

Question 2

What is the difference between a data URI and raw Base64?

Accepted Answer

A data URI is the full string including the MIME type prefix — for example data:image/png;base64,iVBOR… — which you can paste directly into an HTML img src attribute or a CSS url(). Raw Base64 is just the encoded string without the prefix, useful when your API or database stores only the encoded bytes.

Question 3

Which image formats are supported?

Accepted Answer

You can convert PNG, JPG, GIF, WebP, SVG and BMP images. Any format your browser can display can be encoded to Base64. When decoding, the tool automatically detects the format from the Base64 data.

Question 4

Are my images uploaded to a server?

Accepted Answer

No. All encoding and decoding happens locally in your browser using the FileReader API. Your images are never sent to our servers or any third-party service, so sensitive or private images remain on your device.

Free Base64 Image Converter

1. Choose an image

2. Base64 output

1. Paste your Base64 string

2. Image preview

All formats supported

Data URI or raw Base64

Private & offline

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