What is a Data URI?
A Data URI (Uniform Resource Identifier) scheme allows you to embed small files inline directly within HTML or CSS documents. Instead of linking to an external image file, the image is encoded into a Base64 text string. This allows the browser to render the image immediately without making an additional HTTP request.
Why process images locally?
Security and speed. Many online developer tools upload your files to external servers to process them, which can be a security risk if you are working with proprietary assets, unreleased UI designs, or sensitive images. This tool uses your browser's native FileReader API to generate the Base64 strings. Your images never leave your device.
When should I use Base64 images?
While embedding images directly into your code can reduce HTTP requests, it should be used strategically.
- Best for: Small icons, loading placeholders, tiny UI elements, or HTML email templates where external images might be blocked.
- Avoid for: Large photographs or complex graphics. Base64 encoding increases file sizes by approximately 33%. Placing a 2MB image directly into your CSS file will cause severe render-blocking and slow down your page load times.