Upload any image and get its Base64-encoded data URL in seconds with this free image to Base64 converter online — drag and drop or browse, no server upload, no account needed. The result is ready to paste directly into HTML, CSS, JSON, or any API that accepts Base64-encoded images.

Choose from four output formats: raw Base64, full data URL, an HTML <img> tag, or a CSS url() value — whichever fits your workflow. A live preview with zoom and metadata (dimensions, file size, encoded size) confirms the conversion before you copy.

How to Convert an Image to Base64

Drop your image onto the upload area, or click browse to select a file — PNG, JPG, GIF, SVG, WebP up to 20 MB.
Choose the output format — pick Raw Base64, Data URL, HTML <img>, or CSS url() from the format selector.
Copy the result — click Copy or press Shift + Enter to copy the encoded string to your clipboard.

The tool displays the image dimensions, original file size, and encoded size so you know exactly what you're embedding before committing it to your code.

What Is a Base64 Data URL?

A data URL embeds the entire contents of a binary file — like an image — as a text string inside your code. For an image it looks like:

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAA...

The browser reads this string and renders the image without making any network request. You can put this directly in a <img src="..."> attribute, a background-image in CSS, or pass it as a JSON field to an API. The tradeoff is size: Base64 encoding adds about 33% overhead compared to the original binary file.

Common Use Cases

Eliminating HTTP requests for small assets: Small icons, logos, and UI elements encoded as data URLs load with the HTML/CSS document instead of triggering separate network requests. Best for assets under 5–10 KB where the size overhead is negligible.
Self-contained HTML files: When building single-file HTML demos, email templates, or offline documents, embedding images as Base64 means the file works anywhere without external dependencies.
HTML email images: Many email clients block remotely loaded images by default but render inline data URLs without issues, making Base64 the reliable choice for email signatures and transactional email logos.
API and JSON payloads: REST APIs and webhook payloads that transfer images often expect a Base64 string. Generate the encoded value here and paste it directly into your request body or config file.
Canvas and WebGL workflows: When loading images programmatically into a <canvas> context, Base64 strings avoid cross-origin (CORS) restrictions that apply to externally hosted image URLs.
CSS sprites and custom icons: Inline SVG icons or small PNG sprites as Base64 in a stylesheet to ship a single CSS file with no external image dependencies.

Frequently Asked Questions

How do I embed a Base64 image in HTML?

Use the data URL output format. Copy the full string starting with data:image/...;base64, and paste it as the src value of an <img> tag: <img src="data:image/png;base64,iVBOR..." alt="description" />. Or use the HTML <img> output option — this tool generates the complete tag for you.

How do I use a Base64 image in CSS?

Copy the CSS url() output from the format selector. It generates a string like url('data:image/png;base64,...') that you can paste directly into any CSS property that accepts an image, such as background-image or content.

What is the maximum file size this tool supports?

Up to 20 MB. For larger images, the Base64 string becomes very long and may cause performance issues when embedded in HTML or CSS — browsers must parse and decode the entire string inline. For images above a few KB, consider whether hosting the file separately and linking to it is more appropriate.

Does encoding an image to Base64 reduce its quality?

No. Base64 is a lossless encoding — it converts the binary file to text and back without any modification to the pixel data. The encoded string represents exactly the same image as the original file.

Is my image uploaded to any server?

No. The entire conversion happens in your browser using the FileReader API. Your image never leaves your device, and the tool functions fully offline once the page is loaded.