A base64 image encoder converts image files to data URIs that can be embedded directly in HTML, CSS, or JSON — eliminating the need for a separate image file request. All encoding is done in your browser; no image data is uploaded to any server.
Drop an image here or click to upload
PNG, JPG, GIF, WebP, SVG, ICO supported
Preview
Encoded Output
How to Use the Base64 Image Encoder
The base64 image encoder converts any image file into a self-contained data URI that can be embedded directly in HTML or CSS without requiring a separate HTTP request for the image file.
Step 1: Upload Your Image
Click the drop zone or drag and drop an image file. Supported formats include PNG, JPG, GIF, WebP, SVG, and ICO. The encoding happens instantly in your browser — no upload occurs.
Step 2: Choose Output Format
Select your preferred output: Data URI (the full data: URL for use anywhere), Raw base64 (just the encoded string), HTML img tag (ready-to-paste img element), or CSS background-image (ready-to-paste CSS rule).
Step 3: Copy and Use
Click "Copy to Clipboard" and paste directly into your HTML, CSS, or JSON. The data URI is self-contained — it works in any browser without an internet connection or server.
When to Use Base64 Images
Base64 is best for small images under 5-10KB: favicons, small icons, placeholder images, or inline email images. Avoid base64 for large images — the ~33% size increase and loss of browser caching (base64 images are re-decoded on every page load) outweigh the HTTP request savings.
Using in React, Vue, or Angular
In a component, assign the data URI to the src attribute: const logo = "data:image/png;base64,...", then use <img src={logo} />. This is common for small icons bundled with a component library.
Frequently Asked Questions
Is this base64 image encoder free?
Yes, completely free. All encoding happens in your browser using the FileReader API — no image data is ever uploaded to any server.
Is my image data safe when using this tool?
Absolutely safe. The encoding is done entirely client-side in JavaScript. Your image file never leaves your device, is never uploaded, and is never stored anywhere. You can use this tool offline once the page is loaded.
What is a base64 data URI?
A base64 data URI is a way to embed file data directly in a URL or HTML attribute. Format: data:[mediatype];base64,[encodeddata]. For example: data:image/png;base64,iVBORw0KGgo.... This allows embedding images directly in HTML <img> tags, CSS background-image properties, or JSON payloads without a separate file reference.
Why is the base64 encoded size larger than the original?
Base64 encoding converts every 3 bytes of binary data into 4 ASCII characters. This means base64 encoded data is approximately 33% larger than the original binary file. A 100KB PNG becomes roughly 133KB as a base64 string. This size increase is a trade-off for the convenience of inline embedding.
When should I use base64 images instead of regular file references?
Use base64 for small, frequently-used images like icons, logos, and placeholder images where the HTTP request overhead of a separate file is not worth the network cost. Avoid base64 for large images (over 5-10KB) as the size inflation plus lack of browser caching outweighs the request savings.
What image formats can I encode?
All common web image formats work: PNG, JPG/JPEG, GIF, WebP, SVG, ICO, and BMP. The tool auto-detects the MIME type from the file. SVG images can also be encoded as text/html+svg or as regular base64.