Why did my SVG or ICO file fail to convert on another tool?

On some systems, particularly Windows, browsers report an empty file type for .svg and .ico files because those extensions aren't registered in the operating system's MIME database. A tool that trusts the browser's reported type alone will either reject the file or produce a broken data URI with no image format in it. This tool checks the file's actual signature and, if needed, its extension, so SVG and ICO files convert correctly regardless of what the browser reported.

Image to Base64 Converter Online Free

Drag and drop a PNG, JPG, GIF, WebP, SVG or ICO to get a Base64 data URI instantly. The format is detected from the file's actual content, so SVG and ICO convert correctly even on systems that don't report a file type for them. Runs entirely in your browser.
Data URI · Raw Base64 · HTML & CSS output · Free

Drag & Drop Image Here

PNG, JPG, GIF, WebP, BMP, SVG, ICO — up to 10 MB

Image Preview

Base64 Output

Image Information

Filename—

Format—

Dimensions—

File Size—

Base64 Length—

Data URI Size—

How It Works

1. Drop Your Image

PNG, JPG, GIF, WebP, BMP, SVG or ICO — up to 10 MB.

2. Format Is Detected

Read from the file's own signature, not just the browser's (sometimes wrong) label.

3. Choose Format

Data URI, raw Base64, an HTML <img> tag, or a CSS url().

4. Copy or Download

Copy to clipboard or download as a .txt file.

What Is an Image to Base64 Converter?

An image to Base64 converter turns the binary bytes of an image file into a Base64 ASCII string, safe to embed in HTML, CSS, JSON or XML without a separate image file or an extra HTTP request. This tool encodes entirely in your browser using the FileReader API — your image is never uploaded.

Supported formats

PNGlossless, transparency

JPG / JPEGphotos

GIFincluding animated

WebPmodern, smaller

BMPuncompressed

SVGvector

ICOfavicons

Why SVG and ICO sometimes fail on other tools

Browsers get a file's MIME type from the operating system, and on some systems — Windows in particular — .svg and .ico aren't registered there, so file.type comes back empty. A tool that trusts that value blindly either rejects the file outright, or worse, produces a data URI with no format in it at all (data:;base64,...), which renders as a broken image everywhere it's used. This tool checks the file's own signature — and falls back to its extension — so the correct data:image/svg+xml;base64, or data:image/x-icon;base64, prefix is used regardless of what the browser reported.

Using the Output

HTML

<img src="data:image/png;base64,iVBORw0KGgo..." alt="My image"/>

CSS

.icon {
  background-image: url('data:image/png;base64,iVBORw0KGgo...');
}

Raw Base64 for APIs and JavaScript

Use the Raw Base64 tab when an API or script expects the string without the data: prefix:

// build the data URI yourself when needed:
const base64 = "iVBORw0KGgoAAAANSUhEUgAA...";
const dataURI = `data:image/png;base64,${base64}`;

When Base64 images make sense

Small icons and sprites (roughly under 2–3 KB) — avoids a separate HTTP request.
Email templates — inline images still show even when the client blocks external images.
Offline-first apps — store the string in localStorage or IndexedDB.
API payloads — simpler than multipart form data for some JSON/GraphQL APIs.
Single-file HTML documents with no external dependencies.

For larger images, Base64 typically costs about 33% more bytes than the original binary file and cannot be cached separately by the browser — a normal image file with proper HTTP caching is usually the better choice.

Frequently Asked Questions

What is an image to Base64 converter?

It encodes an image's binary bytes into a Base64 ASCII string. Prefixed as a data URI (data:image/png;base64,...), it can be embedded directly in HTML, CSS or JSON with no separate file and no server request.

Why did my SVG or ICO file fail on another tool?

On some systems, especially Windows, browsers report an empty file type for .svg and .ico because those extensions aren't registered in the OS's MIME database. A tool that trusts that value alone either rejects the file or produces a broken data URI with no image format in it. This tool checks the file's actual signature and, if needed, its extension, so those formats convert correctly regardless of what the browser reported.

How do I use a Base64 image in HTML?

Select the HTML <img> tab for a ready-to-paste tag with the data URI as the src. The image displays inline with no external file.

How do I use a Base64 image in CSS?

Select the CSS url() tab for a ready background-image declaration — useful for small icons and patterns where you'd rather avoid an extra request.

Is this converter safe to use?

Yes. The image is read locally with the FileReader API and encoded entirely in your browser. It's never uploaded, and it keeps working offline once the page has loaded.