Base64 Image Encoder
Convert images to Base64 data URIs for CSS background-image or HTML img tags. Drag & drop PNG, JPG, GIF, WebP, SVG. Decode Base64 back to downloadable images. Free online Base64 image encoder.
Why Use a Base64 Image Encoder?
Embedding images as Base64 data URIs eliminates extra HTTP requests, which is ideal for small icons, email templates, and single-file HTML documents. Our Base64 Image Encoder lets you drag & drop images to encode them, shows size comparison, and provides ready-to-use HTML img and CSS code snippets.
Key Features
- Drag & drop or select image files (PNG, JPG, GIF, WebP, SVG)
- Convert images to Base64 data URIs instantly
- Convert Base64 back to downloadable images
- File size comparison: original vs Base64 encoded
- Copy as raw Base64, HTML img tag, or CSS background-image
How It Works
- Drag and drop or select image files to encode
- View the Base64 data URI and size comparison
- Copy as raw data URI, HTML img tag, or CSS snippet
- Or paste a Base64 data URI to decode and download as image
Technical Details
This tool uses the FileReader API with readAsDataURL for encoding, which produces a data URI string containing the MIME type and Base64-encoded binary data. For decoding, it uses the atob() function to convert Base64 back to binary, then creates a Blob for download. All processing happens client-side.
Frequently Asked Questions
When should I use Base64 encoded images?
Base64 encoding is best for small images (under 10KB) like icons and logos, where eliminating an HTTP request outweighs the ~33% size increase. It's also useful for email templates, single-file HTML documents, and CSS-only projects where external files aren't an option.
How much larger is a Base64 encoded image?
Base64 encoding increases file size by approximately 33%. The tool shows the exact original and encoded sizes so you can decide whether Base64 is appropriate for your use case.
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