Image to Base64 Converter
Convert images to Base64 data URLs for embedding in HTML, CSS or JavaScript.
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PNG, JPG, GIF, SVG, WebP supported
Convert images to Base64 data URLs for embedding in HTML, CSS or JavaScript.
The Image to Base64 Converter reads an image file from your device and produces a Base64-encoded data URL that can be embedded directly in HTML, CSS, or JavaScript - eliminating the need for a separate image request. It supports PNG, JPG, GIF, SVG, and WebP formats and outputs the result in multiple ready-to-paste formats including data URL, raw Base64, CSS background-image, and an HTML img tag. The entire conversion runs locally in your browser; your image is never uploaded to any server.
When you select or drop an image file, the browser's FileReader API reads the file's raw bytes and encodes them as a Base64 data URL string using the readAsDataURL method. The resulting data URL follows the format data:[mime-type];base64,[encoded-data], which embeds the full image binary as a Base64 string that any browser can interpret directly without a separate HTTP request. This tool then strips or reformats that output into the data URL, raw Base64, CSS, or HTML img tag format you select.
No - the FileReader API operates entirely within the browser's sandboxed environment. Your image file is read directly from your local filesystem into browser memory and converted to Base64 there, with zero network transmission. This is critical for images that may contain sensitive content such as medical scans, identity documents, proprietary product designs, or personal photographs. You can verify this with your browser's Developer Tools Network panel, which will show no upload requests.
The tool accepts any image format that your browser's FileReader and <img> element can handle, which includes PNG, JPEG/JPG, GIF (including animated), SVG, WebP, AVIF, and ICO on modern browsers. There is no hard file size limit enforced by the tool, but encoding large images (above 1-2 MB) will produce very long Base64 strings that may be slow to render and impractical to embed - Base64-encoded images are approximately 33% larger than the source file, which negates the HTTP-request savings for anything but small icons and logos.
Embedding images as Base64 is beneficial for small, frequently used assets (icons, logos, spinners, small decorative images) because it eliminates a separate HTTP request, which can improve perceived performance especially on high-latency connections. However, for images larger than a few kilobytes, the 33% size overhead, inability to be cached by the browser independently, and the bloated HTML or CSS file size make separate image files the better choice. Base64 images are also widely used for passing image data to AI APIs and inline email images where external URL references may be blocked.
ImageMagick's base64 command and Python's base64.b64encode produce the same RFC 4648-compliant Base64 output as this browser tool, but require installation, shell access, and knowledge of the command syntax. This tool additionally generates the complete ready-to-use data URL, CSS background-image declaration, and HTML img tag formats - saving you the step of manually constructing the surrounding string. For one-off conversions and rapid iteration during front-end development, the browser-based approach is significantly faster.