Drop an image file or click to browse. It's read directly in your browser.
Developer
On-device · No upload
Image to Base64 Converter
Convert an image into a Base64 string, or decode Base64 back into an image — instantly, right in your browser.
Image to Base64 Converter turns any image into a Base64 data URI you can paste directly into HTML, CSS, or JSON — and converts Base64 strings back into downloadable images. Everything runs locally in your browser, so files never leave your device. No upload, no account, no size limit. Built by FreeToolHub.
Drop an image here or click to browse
Your image never leaves your browser
0 Characters
0 B Encoded size
Your image and any Base64 you paste stay on this device. Nothing is uploaded.
This doesn't look like valid Base64 image data.
Preview
Your image and any Base64 you paste stay on this device. Nothing is uploaded.
How It Works
Your image is instantly encoded as a Base64 data URI, ready to copy or download.
Paste the string into HTML, CSS, or JSON to embed the image without a separate file.
Switch to the Decode tab, paste a Base64 string, and preview or download it as an image again.
Frequently Asked Questions
Is my image uploaded anywhere?
No. Encoding and decoding both happen locally in your browser using the FileReader API. Your image is never sent to any server.
What is a Base64 image string used for?
Base64-encoded images can be embedded directly inside HTML, CSS, or JSON as a data URI, avoiding a separate network request for small images, icons, or emails where external image links aren't reliable.
Does converting to Base64 increase the file size?
Yes, by design. Base64 encoding represents binary data using only text characters, which adds roughly 33% overhead compared to the original file size.
Which image formats are supported?
Any format your browser can read as a file, including PNG, JPEG, GIF, WebP, BMP, and SVG. The generated data URI includes the correct MIME type automatically.
Can I convert a Base64 string back into an image file?
Yes. Switch to the Decode tab, paste a Base64 string or full data URI, and the tool renders a preview you can download as an image file.