How to use the image to Base64 converter
- Click "Choose an image" and pick a file — PNG, JPG, GIF, WebP and SVG all work.
- Press "Convert to Base64". The file is read locally in your browser and encoded.
- Read the preview and compare the original size against the encoded size.
- Press "Copy full Base64" to copy the complete data URI to your clipboard, ready to paste into HTML, CSS or JSON.
What is Base64 encoding
Base64 is a way of representing binary data — like the bytes inside an image file — using only 64 printable text characters. Because the result is plain text, it can be embedded directly into places that normally hold text, such as an HTML attribute, a CSS rule or a JSON string. The data URI format prepends a header like data:image/png;base64, so a browser knows exactly how to decode and display the content without fetching anything else.
The trade-off is size: Base64 output is roughly a third larger than the original binary, because every three bytes become four characters. For tiny icons that is a bargain — you remove an HTTP request and speed up the page. For large photos, it usually is not worth the extra weight.
When to use Base64 images
Embedding images as data URIs shines for small, frequently reused assets: icons, logos, avatars and background textures. Because the image travels inside the HTML or CSS file itself, the browser skips a separate network request, which can make a page feel faster and reduces the number of moving parts. Email templates are another common use, since many email clients block external images but will render inline ones.
For anything larger than a few kilobytes, a normal hosted image is usually the better choice. Large Base64 strings bloat documents, cannot be cached independently, and slow down parsing. Use this converter for the small assets where embedding pays off, and keep bigger images as regular files.
Why your file stays private
This tool runs entirely in your browser using the FileReader API. Your image is read from your own device and converted on the spot — nothing is uploaded, transmitted or stored on any server. That makes it safe for logos, private screenshots and other images you would not want to send anywhere.