Image to Base64 Converter
Upload a PNG, JPG, GIF, SVG, or WebP image and get the Base64 data URL instantly. Drag-and-drop supported. Fully client-side.
Drop image here or click to browse
PNG, JPG, JPEG, GIF, SVG, WebP accepted
Upload an image above to see its Base64-encoded data URL. All processing happens entirely in your browser — nothing is uploaded to any server.
Frequently Asked Questions
What is Base64 encoding for images?
Base64 encoding converts binary image data into an ASCII string using 64 printable characters. The result is a data URL — a self-contained string you can embed directly in HTML <img> tags or CSS background-image declarations, eliminating the need for a separate HTTP request to load the image.
Is my image data private? Is anything uploaded?
Yes, completely private. This tool uses the browser's native FileReader API to process your image entirely on your device. No image data, file names, or encoded strings are ever sent to a server. You can even use this tool while offline.
How do I use the Base64 data URL in HTML or CSS?
Copy the full Data URL output and paste it as the src attribute of an img tag: <img src="data:image/png;base64,..." />. For CSS, use it inside url(): background-image: url("data:image/png;base64,..."). The "Base64 Only" button strips the prefix — use this when an API or library expects the raw encoded string without the data URI scheme.
Why is the Base64 output about 33% larger than the original image?
Base64 represents every 3 bytes of binary data using 4 ASCII characters. This 4:3 ratio means the encoded string is always roughly 33% larger than the source file. For this reason, embedding large images as Base64 in HTML or CSS can significantly increase page size — it is best suited for small icons, SVGs, and inline sprites rather than full-size photographs.