Image to Base64
Convert any image to a Base64 encoded data URL string. Copy the result for use in CSS, HTML, or JSON. Runs entirely in your browser.
Drop an image here or click to upload
PNG, JPEG, WebP, GIF, SVG
About Image to Base64
The Image to Base64 converter turns any image file into a Base64-encoded data URL string that you can embed directly in HTML, CSS, or JSON. Upload an image and instantly get the encoded string ready to copy and paste into your code.
Base64 encoding represents binary image data as plain ASCII text. The resulting data URL can be placed in an img tag's src attribute, a CSS background-image property, or a JSON payload without needing a separate image file or additional HTTP request. This technique is especially valuable for small icons, logos, and UI sprites where the overhead of an extra network request outweighs the slight size increase from encoding.
The tool displays a preview of your uploaded image alongside the generated Base64 string in a scrollable, copyable text area. It shows the string length and estimated size so you can evaluate whether inline embedding makes sense for your use case. A toggle lets you include or exclude the data:image/...;base64, prefix depending on how your code handles the URL.
Developers commonly use Base64 images in single-page applications, email templates where external images may be blocked, offline-capable web apps, and configuration files that need to carry image data as text. The tool also helps when debugging - you can quickly convert a file to see its Base64 representation or verify that a data URL renders correctly.
All conversion happens locally in your browser using the FileReader API. No image data is transmitted to any server, ensuring your files remain private and the tool works offline.
Frequently Asked Questions
What is a Base64 data URL?
A Base64 data URL encodes binary image data as a plain text string that can be embedded directly in HTML, CSS, or JSON. It follows the format data:image/png;base64,... where the image bytes are represented as ASCII characters. This eliminates the need for a separate image file and HTTP request.
When should I use Base64-encoded images?
Base64 images are useful for small icons, logos, and UI elements where eliminating an extra HTTP request improves performance. They are also handy for embedding images in emails, single-file HTML documents, or JSON payloads. Avoid Base64 for large images because the encoded string is roughly 33% larger than the original binary file.
What does the data prefix option do?
When enabled (the default), the output includes the full data URL prefix such as data:image/png;base64, which is ready to use directly in an HTML img src attribute or CSS background-image url(). Disabling it gives you only the raw Base64 string, useful when the prefix is added separately by your code or framework.
Is there a size limit for conversion?
There is no hard limit in this tool, but very large images produce very long Base64 strings that can slow down your editor or increase page weight significantly. For images larger than 50-100 KB, serving the file normally is usually a better approach.