How to use the Image to Base64 tool
- Choose Image → Base64 and drop an image, or choose Base64 → Image and paste a string.
- Copy the data URI, the Base64 only, or a ready-made HTML <img> or CSS snippet.
- When decoding, preview the image and download it.
What is a Base64 image?
A Base64 data URI stores an image as plain text, so it can be embedded directly in HTML, CSS, JSON or email templates without a separate file. It is handy for small icons and logos, and avoids an extra network request.
Base64 text is about a third larger than the original file, so it is best for small images.
Frequently asked questions
Is there a size limit?
No hard limit, but very large images produce very long strings that can slow down editors.
Can I decode a string without the “data:” prefix?
Yes. Paste raw Base64 and the image type is detected automatically.
Is the Image to Base64 tool really free?
Yes — completely free, forever. There is no sign-up, no payment, no watermark and no daily limit.