Image to Base64 Converter
Convert images to Base64 strings for embedding in HTML, CSS, or JSON.
Drop an image here or click to upload
Supports PNG, JPG, GIF, SVG, WebP, ICO (max 5MB)
How to Convert an Image to Base64
- Upload your image — drag and drop an image onto the upload zone, or click to select a file (PNG, JPG, GIF, SVG, WebP — max 5MB).
- See the preview — a thumbnail and file info appear below the drop zone.
- Choose output format — select Raw Base64, Data URI, HTML <img> tag, or CSS background.
- Copy or download — click Copy to copy the encoded string, or Download to save as a text file.
Frequently Asked Questions
Why convert an image to Base64? ▼
Base64 encoding lets you embed images directly in HTML, CSS, or JSON without a separate HTTP request. This can improve performance for small images (icons, logos) by eliminating extra file requests, and is essential when embedding images in email templates or data APIs.
Is my image uploaded to a server? ▼
No — the conversion happens entirely in your browser using the FileReader API. Your image is never uploaded to any server. This makes it safe to convert private or sensitive images.
What is a data URI? ▼
A data URI embeds file data directly in a URL:
data:[mediatype];base64,[encoded data]. For example: data:image/png;base64,iVBORw0K.... This string can be used directly in HTML img src attributes, CSS url() values, and JSON.What image formats are supported? ▼
PNG, JPG/JPEG, GIF, SVG, WebP, and ICO are supported. Maximum file size is 5MB. Note that Base64 encoding increases the file size by approximately 33% compared to the original binary, so large images produce very long strings.
Should I use Base64 for large images? ▼
Base64 is best for small assets under 10KB (icons, small logos, sprites). Large Base64 images increase your HTML/CSS file size significantly and cannot be cached separately by the browser. For larger images, serve them as separate files for better performance.