How to Convert Images to Base64 and Why

Published: March 2025 • 5 min read

What is Base64

Base64 is a way to encode binary data (like images) as text. This allows you to embed images directly in HTML, CSS, or JSON without needing a separate image file. The encoded string starts with data:image/png;base64, followed by the encoded data.

When to Use Base64

• Small icons and logos (under 10KB) to reduce HTTP requests
• Email templates that need inline images
• Sending images through APIs or JSON
• Embedding images in CSS backgrounds

When NOT to Use Base64

Base64 increases file size by 33%. Do not use it for large photos or multiple images on a page. For those, use regular image files optimized with our Image Compressor.

Convert Now

Use our free Image to Base64 converter or the reverse Base64 to Image tool.