Image to Base64 Converter
Convert any image to a Base64 data URL for embedding in HTML, CSS or JSON. The conversion happens entirely in your browser — nothing is uploaded.
How to use
- Click "Choose image" and select a JPG, PNG, WebP or GIF file.
- The Base64 data URL appears instantly with a preview of the image.
- Copy the Base64 string or the complete HTML img tag with one click.
Frequently asked questions
What is a Base64 image?
A Base64 image is an image encoded as a text string using the Base64 alphabet. It can be embedded directly in HTML, CSS or JSON without a separate file, using a data URL like data:image/png;base64,...
When should I use Base64 images?
Base64 is useful for small icons and logos embedded in HTML emails, CSS files or single-page apps where you want to avoid extra HTTP requests. For large images, a separate file is more efficient because Base64 increases file size by about 33%.
Is my image uploaded anywhere?
No. The conversion uses the browser's FileReader API to read the file locally. Your image never leaves your device.
Why is the Base64 output larger than the original?
Base64 encoding converts every 3 bytes of binary data into 4 ASCII characters, increasing the size by approximately 33%. This is the trade-off for making binary data safe to embed in text formats.