Image to Base64 Converter
Encode an image to a Base64 data URI right in your browser — copy it as a string, an <img> tag, or CSS. No upload, completely private.
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How Base64 image encoding works
What is a Base64 image?
Base64 is a way of representing binary data — like an image — using only plain text characters. A Base64 "data URI" embeds the whole image directly inside your HTML or CSS, so the browser doesn't have to make a separate network request to fetch it.
A data URI looks like data:image/png;base64,iVBORw0KGgo… — the prefix tells the browser the file type, and everything after the comma is the encoded image.
When should you inline an image as Base64?
Inlining is ideal for tiny, frequently-used assets: icons, logos, placeholder images, or email signatures. Because the image travels inside the HTML/CSS, it appears instantly with zero extra requests.
Avoid Base64 for large photos. Base64 makes a file roughly 33% bigger, and large inlined images bloat your HTML, can't be cached separately, and slow down the initial page render. For anything above a few kilobytes, a normal <img> file is faster.
Is this private?
Yes. The encoding happens entirely inside your browser using the FileReader API. Your image is never uploaded to a server, so even very large or sensitive images stay on your device.
Frequently asked questions
Does converting to Base64 increase the file size?
Yes — Base64 adds about 33% overhead because it represents 3 bytes of binary data with 4 text characters. That's why it's best for small images and why large photos should stay as regular files.
Which image formats can I encode?
Any format your browser can read — PNG, JPG/JPEG, WebP, GIF, SVG, BMP, and ICO. The output data URI keeps the original format's MIME type.
How do I use the Base64 string in HTML?
Paste it as the src of an image tag: <img src="data:image/png;base64,…" />. Use the "Copy as <img> tag" button to get this ready-made.
How do I use it in CSS?
Use it as a background image: background-image: url("data:image/png;base64,…"); The "Copy as CSS" button formats this for you.
Is my image uploaded anywhere?
No. Everything runs locally in your browser via the FileReader API. No image data leaves your device.