Image to Base64 Encoder
Convert images to Base64 strings for embedding in HTML or CSS. Decode Base64 back to images too.
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Free Image to Base64 Encoder
Base64 encoding converts binary image data into a text string that can be embedded directly in HTML, CSS, or JSON files. This eliminates the need for separate image file requests, which can improve page load performance for small images like icons, logos, and thumbnails. SmarterSources's Base64 encoder runs entirely in your browser — your images are never uploaded to any server, ensuring complete privacy.
When to Use Base64 Images
Base64 encoding is ideal for small images (under 10-20 KB) such as icons, simple graphics, and placeholders. Embedding these directly in your code reduces HTTP requests and can speed up initial page rendering. For larger images, it's generally better to serve them as separate files since Base64 encoding increases the data size by approximately 33%.
How to Use Base64 in HTML and CSS
In HTML, use the Data URI as the src attribute of an <img> tag. In CSS, use it as the url() value for background-image. Both approaches embed the image data directly in your code, removing the need for an external file reference.
Frequently Asked Questions
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that represents binary data (like image files) as an ASCII string. It uses 64 printable characters (A-Z, a-z, 0-9, +, /) to represent binary data, making it safe to embed in text-based formats like HTML, CSS, and JSON.
Does Base64 encoding increase file size?
Yes, Base64 encoding increases the data size by approximately 33% compared to the original binary. However, for small images, the tradeoff is worthwhile because it eliminates an additional HTTP request, which can actually improve overall page load time.
What's the difference between Data URI and raw Base64?
A Data URI includes a prefix like data:image/png;base64, followed by the Base64 string. This format can be used directly in HTML src attributes or CSS url() values. Raw Base64 is just the encoded string without the prefix — useful when you need to store or transmit the data separately and add the prefix yourself.
Is my image data private?
Absolutely. SmarterSources processes everything entirely within your browser using the FileReader API. Your images are never uploaded to any server. The Base64 conversion happens locally on your device, making this the most private Base64 encoding tool available online.
What image formats are supported?
This tool supports all image formats that your browser can render, including PNG, JPEG, WebP, GIF, BMP, SVG, and ICO. The encoded output preserves the original format in the Data URI prefix so browsers can correctly render the decoded image.