Convert images to Base64 encoded strings. Get data URIs ready for HTML and CSS embedding. Supports PNG, JPG, GIF and SVG. Free online tool.
What Is Image to Base64 Converter Online?
Image-to-Base64 conversion encodes an image file as a Base64 text string that can be embedded directly in HTML, CSS or JSON. The encoded string can be used as a data URI (data:image/png;base64,...) wherever an image URL would normally go. This eliminates the need for a separate HTTP request to load the image.
This technique is most useful for small images like icons, logos and decorative elements where the overhead of an additional HTTP request is proportionally large compared to the image size. For larger images, the 33% size increase from Base64 encoding and the inability to cache the image separately make it less efficient than serving the image as a regular file.
How to Use This Tool
Click the upload button or drag and drop an image file.
The image is encoded to Base64 instantly in your browser.
View the data URI string and a preview of the encoded image.
Copy the data URI for embedding in HTML <img> tags or CSS background-image properties.
For decoding, paste a Base64 image string to preview the image.
Tips & Best Practices
Use Base64 embedding for small images (under 10KB) — icons, logos and small decorative elements.
For images larger than 10KB, serving them as regular files is more efficient due to Base64's 33% size overhead.
Base64-encoded images in CSS or HTML cannot be cached separately by the browser.
Include the correct MIME type in the data URI prefix (image/png, image/jpeg, image/svg+xml).
Common Use Cases
Embedding small icons and logos directly in HTML email templates.
Including images in CSS stylesheets without separate image files.
Converting images for storage in JSON or database text fields.
Reducing HTTP requests by inlining critical small images.
Frequently Asked Questions
Why convert images to Base64?
Base64-encoded images can be embedded directly in HTML or CSS without separate file requests. This reduces HTTP requests and is useful for small icons, email signatures and single-page apps.
What image formats are supported?
The tool supports PNG, JPG, JPEG, GIF, SVG and WebP formats.