Image to Base64 Converter
Turn an image into a Base64 data URI you can paste straight into HTML or CSS. See the encoded size, preview the string, and copy the full value with one click.
Your file is processed locally in your browser and never uploaded.
Your result will appear here
Base64 data URI
Preview (first 200 characters):
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How to use
- Upload an image — any common format works.
- The tool encodes it as a Base64 data URI and shows the original size, encoded length and MIME type.
- Click Copy full data URI to paste it into your HTML or CSS, or download it as a text file.
Frequently asked questions
What is a Base64 data URI?
It is the image's bytes written out as plain text, prefixed with something like data:image/png;base64,. A browser can display it just like a normal image URL, so you can embed a small image directly in HTML or CSS without a separate file.
Why is the Base64 string bigger than the image?
Base64 encoding adds about 33% overhead — every 3 bytes of image become 4 characters of text. That is why it is best for small images like icons and logos.
Is my image uploaded to a server?
No. Encoding happens entirely in your browser with the FileReader API. Your image never leaves your device.
How do I use the data URI in HTML?
Paste the whole string as the src of an img tag, like <img src="data:image/png;base64,..." alt="...">. For large images, linking a normal image file is faster — use data URIs mainly for small graphics. You can convert image to base64 online — no signup, nothing to install.
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