What is a Base64 image data URL?

A Base64 data URL is a way to embed image data directly into HTML, CSS, or JavaScript as a text string instead of referencing an external file. It starts with `data:image/png;base64,` followed by the Base64-encoded binary content of the image. This eliminates the need for a separate HTTP request to load the image.

Are my images uploaded to a server?

No. This tool is 100% client-side. Your images are read directly in your browser using the FileReader API and are never sent to any server. Your files remain completely private on your device.

When should I use Base64-encoded images?

Base64 images are ideal for small icons, favicons, or images used in CSS backgrounds where you want to avoid extra HTTP requests. They're also useful in email templates (where external image URLs are often blocked), single-file HTML documents, and inline SVG data URLs. For large images, external files are typically more efficient since Base64 increases file size by ~33%.

What image formats does this tool support?

This tool supports all major image formats: PNG, JPG/JPEG, GIF, SVG, WebP, BMP, and ICO. The output data URL will include the correct MIME type for the format you upload (e.g., `data:image/png;base64,...` for PNG files).

Why is my Base64 output larger than the original file?

Base64 encoding converts binary data to ASCII text, which increases the data size by approximately 33%. This is a known trade-off. For large images, it's better to reference them as external files. Base64 is most practical for small assets (under ~10 KB) where the elimination of an HTTP request outweighs the size overhead.

How do I use the Base64 image in CSS?

Use the CSS snippet output: `background-image: url("data:image/png;base64,...")`. This sets the element's background to the encoded image. You can paste this directly into your CSS file or style attribute.

Free Image Encoder

Convert Images to
Base64 Data URLs

Drag & drop any image and instantly get the Base64 string for embedding in HTML, CSS, JavaScript, or email templates. No server uploads. No sign-up required.

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100% Private

All encoding happens in your browser using the FileReader API. Your images are never uploaded to any server.

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Instant Results

Get the Base64 data URL the moment you drop your file. Copy as a full data URL, CSS snippet, or HTML attribute.

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Any Image Format

Supports PNG, JPG, JPEG, GIF, SVG, WebP, BMP, and ICO files. See a live preview alongside the encoded output.

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or click to browse · PNG, JPG, GIF, SVG, WebP, BMP, ICO

Frequently Asked Questions

Everything you need to know about Image Base64 Converter.

Convert Images toBase64 Data URLs

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Any Image Format

Frequently Asked Questions

Convert Images to
Base64 Data URLs