Image to Base64

Embed images directly in your HTML, CSS, and JSON by 変換ing them to Base64 encoding. This technique eliminates separate image files for small graphics and icons.

Data URLs explained

Base64-encoded images can be embedded directly in HTML and CSS as data URLs. Instead of linking to an external file, you include the image data inline. This approach reduces HTTP requests for small images and ensures images load with the HTML document.

HTML and CSS integration

Embedded Base64 images work in HTML img tags (src attribute) and CSS background-image properties. Paste the data URL directly—no separate file ダウンロード required. This is particularly useful for small icons, placeholders, and inline graphics.

JSON and API responses

When APIs need to return images, Base64 encoding allows serialization in JSON フォーマット. This approach avoids separate image endpoints and simplifies API responses for single-item metadata that includes images.

Encoding options

The tool provides both the complete data URL (with MIME type prefix) and raw Base64 string. Use the data URL directly in HTML and CSS. Use the raw Base64 when your context requires just the encoded data.

Performance considerations

Base64 encoding increases data size by about 33% compared to binary. This tradeoff is worth it for tiny images and icons where HTTP request overhead exceeds the encoding penalty. For large images, separate files remain more efficient.

Practical applications

Embed favicons directly in HTML to avoid 404 errors, inline small SVG icons in CSS to reduce requests, encode profile pictures for JSON API responses, and 作成 self-contained HTML files with embedded graphics.