Image to Base64 Converter Online — Create a Data URL
Convert an image to a Base64 data URL locally for use in HTML, CSS or development tests.
Images are processed locally in your browser and are not uploaded.
About this tool
FileReader reads the selected file as a data URL containing its MIME type and Base64 payload. No image re-encoding occurs.
How to use
- Choose an image.
- Convert it locally.
- Copy the complete data URL.
Features
- Preserves original file bytes.
- Includes MIME prefix.
- Local clipboard workflow.
Common use cases
- Embed small HTML images.
- Create CSS data URLs.
- Test API payloads.
Common issues and tips
- Base64 is about one-third larger than binary.
- Large data URLs hurt page size and caching.
Privacy
The image remains local.
Frequently asked questions
Is it only the Base64 payload?
No, output is a complete data URL.
Does quality change?
No, bytes are read rather than re-encoded.
Should large images be embedded?
Usually not; normal files are more efficient.