Image to Base64 Data URI

About this tool

Upload an image and get a Base64 data URI you can paste straight into HTML (img src) or CSS (background) without a separate file.

Example

Input: (upload logo.png)

Output: data:image/png;base64,iVBOR...

Privacy

This tool runs entirely in your browser. Your data is processed locally and never uploaded to a server.

How to use this tool

1. Upload an image file from your device.
2. Wait for the tool to generate the Base64 data URI.
3. Copy the full output string.
4. Paste it into an HTML img src attribute or a CSS background image value.

Step by step, what happens

1. The tool reads the image file you upload and converts its binary content into Base64 text.
2. It adds the correct data URI prefix for the image type so the result can be used directly in web code.
3. You can copy the generated string without needing to host the image on a separate server.
4. If the image is large, the output will also be large, so you may want to use a smaller source file for easier embedding.

Worked example

If you want to embed a tiny logo directly in an HTML page, you can convert a small PNG into a Base64 data URI.

Input: logo.png

1. Upload logo.png to the tool.
2. The tool converts the file into a data URI that starts with the image MIME type and the Base64 payload.
3. Copy the full output and place it in an img tag or CSS background property.

Tips and common mistakes

• Use small images when possible, because Base64 output is longer than the original file.
• Make sure you keep the full data URI prefix when you paste the result into HTML or CSS.
• Check that the file type matches the prefix, such as image png or image jpeg, so the browser can read it correctly.
• For icons or tiny assets, Base64 embedding can be convenient, but for larger images a normal image file is usually easier to maintain.

Frequently asked questions