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Image to Base64

Convert images to Base64 data URIs

Drop an image here or click to browse

PNG, JPEG, GIF, WebP, SVG, BMP

The Image to Base64 converter turns image files into Base64-encoded data URIs you can embed directly in HTML, CSS, JSON, or source code. It supports PNG, JPEG, GIF, WebP, SVG, and BMP, shows exactly how much the encoding grows the file, and runs entirely in your browser — nothing is ever uploaded.

How to Use

  • Select an image: Click the upload area or drag and drop a PNG, JPEG, GIF, WebP, SVG, or BMP file.
  • Review the info: Check the MIME type, original size, and encoded output size.
  • Copy the result: Copy the complete data URI, prefix included, with one click.
  • Embed it: Paste the string into an img src, a CSS background-image, or a JSON payload.

Features

  • Supports six formats: PNG, JPEG, GIF, WebP, SVG, BMP
  • Ready-to-use data URI with the correct MIME type
  • Shows original size, Base64 length, and size overhead
  • One-click copy to clipboard
  • 100% client-side encoding with the FileReader API

What is Base64 Encoding?

Base64 represents binary data as plain ASCII text. Every 3 bytes of a file become 4 characters from a 64-character alphabet, which is why encoded output is always about 33% larger than the original. The result is pure text, so it works anywhere text works: HTML, CSS, JSON bodies, and email attachments.

For images, the encoded string is wrapped in a data URI like data:image/png;base64,iVBORw0… A browser meeting this in an img tag decodes and renders the image without a separate network request. That makes Base64 handy for tiny assets like icons, but a poor choice for photos, where the size overhead and loss of browser caching cost more than the saved request.

Use Cases

  • Web developers: Inline small icons and logos to cut HTTP requests.
  • Email builders: Embed images in HTML email templates without external hosting.
  • API developers: Send thumbnails inside JSON payloads without multipart uploads.
  • Documentation writers: Include screenshots in single-file HTML demos.

Frequently Asked Questions

How much does Base64 encoding increase file size?

Base64 encoding increases file size by approximately 33% because it encodes every 3 bytes of binary data into 4 ASCII characters. For example, a 100KB image becomes roughly a 133KB Base64 string.

When should I use Base64 images vs external files?

Use Base64 for small images (under 10KB) such as icons, logos, and thumbnails where eliminating an HTTP request outweighs the size increase. For larger images, external files with proper caching are more efficient.

Are my images uploaded to a server?

No. All image processing and Base64 encoding happens entirely in your browser using the FileReader API. Your images never leave your device, ensuring complete privacy.