By embedding images directly into your HTML or CSS as base64 strings,
you eliminate separate HTTP requests for image files. This can significantly
improve page load times, especially for sites with many small images like
icons or logos.
Simplified Deployment
Base64 encoded images travel with your code, eliminating the need to manage
separate image files and directories. This makes deployment simpler and
reduces the risk of missing or broken image links in your application.
Perfect for Email Templates
Email clients often block external images by default. Base64 encoded images
are embedded directly in your email HTML, ensuring your images display
immediately without requiring user permission or external server access.
Data URIs Support
All modern browsers support data URIs with base64 encoded images. Use them
in img src attributes, CSS backgrounds, or even as favicon sources. They work
seamlessly across different web technologies and frameworks.
Improved Caching
When images are embedded in your CSS or JavaScript files, they benefit from
the same caching strategy as your code. This means fewer cache invalidation
issues and more predictable performance across page visits.
No External Dependencies
Your images remain accessible even if CDN services are down or blocked.
Base64 encoding ensures complete self-containment of your web application,
improving reliability and reducing dependencies on external resources.
How does this tool work?
Drag and drop your images onto this page (or click to select files), and they are uploaded securely via HTTPS
to our server. Each image is read, optionally compressed and resized, then encoded to a base64 string.
The original file is immediately deleted — we never store your images.
You get the encoded output in two formats: a ready-to-use HTML <img> tag and a CSS
background-image declaration. One click copies either to your clipboard.
Supported formats
This tool supports all common web image formats: JPEG, PNG, GIF,
WebP, SVG, BMP, ICO, TIFF,
AVIF, and HEIC/HEIF. Each format can be compressed before encoding to reduce
the base64 output size. You can also resize images or convert between formats using the options above.
Have questions? Check our FAQ or read the tutorial for
step-by-step instructions and code examples.
File too large for guests
Guest uploads are capped at 1 MB per file.
Log in for up to 5 MB (tokens required) or use our
REST API.
Learn more