Image to Base64
Convert images to Base64 data URIs securely in your browser. Your images are never uploaded to any server, keeping your data completely private.
Convert any image to a Base64 data URI string with SolveBar's Image to Base64 converter. Use the output directly in HTML img src attributes, CSS background-image properties, or API payloads. Also converts Base64 strings back to downloadable images.
When to use Base64 images
Base64 images are useful for: embedding small icons in CSS to avoid extra HTTP requests, including images in HTML emails (many email clients block external images), passing images in JSON APIs that only accept strings, and creating self-contained HTML files with all assets embedded.
Base64 image size implications
Base64 encoding increases file size by approximately 33%. A 100KB image becomes approximately 133KB as Base64. This overhead is acceptable for small images (icons, logos under 10KB) but makes Base64 impractical for large photos.
Using Base64 in HTML and CSS
In HTML: <img src='data:image/png;base64,...' />. In CSS: background-image: url('data:image/png;base64,...'). Copy the full string including the data:image/... prefix for use in HTML and CSS.
Frequently Asked Questions
What is the maximum image size I should convert?
For practical use, keep Base64-encoded images under 50KB (which means the original image should be under 35KB).
Can I convert the Base64 back to an image?
Yes. Paste a Base64 data URI string and the tool decodes it back to a downloadable image file.
Does this work with SVG files?
Yes. SVG files can be Base64 encoded and used as data URIs.