Image to Base64 Converter
Convert any image into a Base64-encoded string entirely in your browser. Free to use, no signup required for occasional use.
Runs fully in your browser — the image never leaves your device.
What is the Image to Base64 Converter?
The Image to Base64 Converter turns any uploaded image into a Base64-encoded text string, the format used to embed images directly inside HTML, CSS, JSON, or email templates without a separate image file request. Developers use Base64-encoded images for small icons, avatars, and inline assets where an extra network request would be wasteful, or when an environment doesn't allow linking to external files. This tool uses the browser's built-in FileReader API to read your image and encode it locally, so the file is never uploaded to a server. It gives you both the full data URL (ready to paste as an <img src> or CSS background-image value) and the raw Base64 string without the data: prefix, for cases where you need to store or transmit just the encoded bytes. It works with PNG, JPG, WebP, GIF, and most other common image formats supported by your browser.
How to use it
Click the upload field and choose an image from your device. The tool immediately reads the file with your browser's FileReader API and displays the resulting Base64 output in two boxes: the full data URL and the Base64-only string. Use the copy button next to either box to copy it to your clipboard, then paste it wherever you need an embedded image reference — for example directly into an HTML <img> tag's src attribute or a CSS background-image: url(...) declaration. Because everything runs client-side, larger images will produce a longer string but the conversion itself is instant.
Frequently asked questions
Is my image uploaded to a server?
No. The conversion happens entirely in your browser using the FileReader API — the image file never leaves your device.
What's the difference between the two output boxes?
The 'data URL' box includes the data:image/...;base64, prefix so it can be pasted directly as an image source. The 'Base64 only' box has just the encoded bytes.
Is there a file size limit?
Very large images can produce very long strings that may be slow to render in the browser, but there's no hard limit imposed by the tool itself.
Which image formats are supported?
Any format your browser can display, including PNG, JPG, WebP, and GIF.