Image to Base64 Converter
Convert any image file to a Base64 data URI for embedding directly in HTML, CSS, or JSON.
Click to select or drag & drop an image
PNG, JPG, GIF, SVG, WebP, AVIF
Results are for general guidance only — not professional advice. Learn more.
How to use this tool
Click the upload area or drag and drop an image file. The conversion happens entirely in your browser — nothing is sent to a server.
- Select or drop any image (PNG, JPG, GIF, SVG, WebP, AVIF).
- Choose the output format you need: Data URI, Raw Base64, CSS background-image, or HTML <img> tag.
- Click Copy Output to copy the result to your clipboard.
- Check the size stats — Base64 is roughly 33% larger than the original. For files over ~5 KB, consider using an external file reference instead.
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Frequently asked questions
What is Base64 encoding?
Base64 is an encoding scheme that converts binary data (like images) into a string of ASCII characters. It uses 64 printable characters to represent binary values. The output is about 33% larger than the original data but can be safely embedded in text-based formats like JSON, HTML, and CSS.
When should I embed images as Base64 in CSS or HTML?
Embedding small images (icons, logos under ~5 KB) as Base64 data URIs can reduce HTTP requests and improve load time for small assets. However, Base64 data is ~33% larger than the original file and cannot be cached separately by the browser. For larger images, external file references are almost always more efficient.
What is a data URI?
A data URI embeds the content of a file directly in a URL string, rather than pointing to an external file. The format is: data:[media type];base64,[encoded data]. Data URIs can be used anywhere a URL is accepted — in img src attributes, CSS background-image, or HTML anchor href for downloads.
Is my image uploaded to a server when I use this tool?
No. This tool uses the browser's built-in FileReader API to convert images entirely on your device. No image data is sent to any server. Your files remain completely private.