Image to Base64 — Free Online Encoder
Convert images to Base64 data URLs for embedding in HTML and CSS
All processing happens locally. No data is sent to any server.
Base64 encoding lets you embed images directly in HTML, CSS, or JSON without separate file uploads. Our Image to Base64 converter reads any image file, displays its metadata (dimensions, file size, format), and outputs the complete data URL or raw Base64 string. Select an image file from your device. The converter reads it as a data URL using the FileReader API, extracts the Base64 portion, and displays a preview along with the file's dimensions, type, and size. Copy the full data URL (ready for use in <img> tags or CSS background-image) or just the raw Base64 string for use in APIs or databases. This is useful for embedding small images (icons, logos, avatars) directly in HTML to reduce HTTP requests, generating Base64 strings for API payloads, or creating inline images in email templates where external hosting isn't available. All processing happens in your browser. Your image is never uploaded to any server. For related encoding tools, check out our [Base64 Encoder/Decoder](/tools/base64) for text encoding or [HTML Encoder/Decoder](/tools/html-encoder) for entity escaping.
FAQ
When should I use Base64 images?
Base64 is best for small images (icons, logos under 10KB) where you want to reduce HTTP requests. For large photos, linking to an external file is more efficient since Base64 increases size by ~33%.
What image formats are supported?
Any format your browser can read: PNG, JPEG, GIF, SVG, WebP, BMP, ICO, and AVIF. The output data URL includes the correct MIME type.
Is my image uploaded?
No. The image is read entirely in your browser using the FileReader API. Nothing is transmitted to any server.