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Image to Base64
Convert images to Base64 encoded strings for embedding.
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Frequently asked questions
Does the output include the data: prefix?
Yes — the string you get is a full data URI (e.g. data:image/png;base64,...), so you can paste it straight into a CSS url() or an img src without adding anything yourself.
Why is the Base64 size bigger than my original file?
Base64 encoding turns every 3 bytes of binary data into 4 text characters, which inflates the size by roughly a third — that's expected overhead, not a bug.
Is my image uploaded to a server?
No — it's read locally with the browser's FileReader API and converted to Base64 entirely on your device.