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This image to Base64 converter turns a picture into a text string you can paste straight into HTML, CSS, JSON or an email template. The browser reads the file with FileReader and returns a data URI that begins with data:image followed by the MIME type and the encoded bytes. You get three ready forms: the raw data URI, an img tag with the source filled in, and a CSS background-image rule you can drop into a stylesheet.
Base64 stores three bytes of binary in four text characters, so the encoded version is always about 33 percent larger than the original file. That trade is worth it for small icons, spacer images and inline logos because it removes an HTTP request. It stops being worth it for photographs: the string bloats your markup, cannot be cached on its own, and blocks rendering. The tool flags any result above 100 KB so you can decide.
How to use the Image to Base64
- Select an image with the file box, or drag and drop one onto the drop area. Files up to 20 MB are accepted.
- Wait a moment while the browser reads the file and builds the data URI. Nothing is sent anywhere.
- Check the stats row for the original file size, the encoded size and the exact growth percentage.
- Use the copy button next to the form you need: raw data URI, HTML img tag, or CSS background-image rule.
Frequently asked questions
Does this tool upload my image anywhere?
No. The conversion runs entirely in your browser using the FileReader API. The image bytes never leave your device, there is no server request and nothing is stored. You can disconnect from the internet after the page loads and the tool still works.
Why is the Base64 string bigger than my image file?
Base64 represents every three bytes of binary data as four printable characters, which adds roughly 33 percent. The data URI prefix adds a few more characters. This overhead is unavoidable and is the main reason data URIs suit small graphics rather than photos.
When should I avoid using a data URI?
Avoid them for anything over about 5 to 10 KB, and definitely over 100 KB. Inlined images cannot be cached separately, are re-downloaded with every page or stylesheet, and delay first paint. A normal image file with proper cache headers is faster in those cases.
Does the encoded image lose quality or keep its EXIF data?
Neither. This tool encodes the original file byte for byte, so there is no re-compression and no quality loss. Every byte is preserved, which means any EXIF metadata in the file, including camera details and GPS tags, is carried into the Base64 string too.