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Image to Base64 Converter

Convert images to Base64 data URIs instantly in your browser. Supports PNG, JPG, GIF, WebP, SVG, and more. Copy as a data URI or raw Base64 string. No upload — files stay on your device.

Drop an image here or click to browse

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Base64-encoding images converts binary pixel data into a text string that can be embedded directly in HTML, CSS, or JSON without referencing an external file. The technique trades a 33% size increase for the elimination of a separate HTTP request, making it a practical optimization for small images in performance-sensitive contexts like above-the-fold CSS.

Image-to-Base64 conversion is used to create CSS data URIs for background images and icons, embed images in HTML email templates (where external image blocking is common), include image content in REST API payloads, store images in JSON configuration files, and generate self-contained HTML documents that work without internet access.

This tool reads image files in the browser using the FileReader API's readAsDataURL() method, which produces a complete Data URI (data:image/png;base64,...) containing the MIME type and Base64-encoded bytes. A toggle switches between the full Data URI format (ready to paste into CSS or HTML src attributes) and the raw Base64 string alone (for API payloads).

Common Use Cases

Inlining icons in CSS stylesheets

CSS background-image properties accept data URIs directly: background-image: url('data:image/svg+xml;base64,...'). Inlining small icons, loading spinners, and decorative elements this way eliminates HTTP round-trips for each asset. Webpack's url-loader does this automatically, but developers hand-crafting CSS or writing email stylesheets need the Base64 string directly.

Embedding images in HTML emails

Email clients like Outlook, Gmail, and Apple Mail often block externally hosted images by default, showing broken image placeholders. Embedding images as Base64 Data URIs in <img src='data:...'> tags makes the images load unconditionally. Email builders for transactional emails (Mailgun templates, Postmark) accept HTML with inline Base64 images.

Sending images via REST API payloads

APIs for services like Google Vision AI, AWS Rekognition (via the Bytes parameter), and OpenAI's vision endpoint accept images as Base64-encoded strings in JSON request bodies. Converting a local image file to Base64 is the required preparation step before constructing the API request, particularly when the service does not support URL-based image references.

Creating self-contained HTML exports

Reporting tools, documentation generators, and screenshot-to-HTML converters produce self-contained HTML files where all assets are inlined. Converting referenced images to Base64 Data URIs and replacing img src attributes ensures the exported HTML renders correctly when opened from the filesystem or shared via email without any accompanying asset files.

How to Use

  1. Drag and drop an image onto the upload area, or click to browse.
  2. The Base64-encoded output appears instantly with a preview.
  3. Toggle between Data URI (includes mime-type prefix) and Raw Base64.
  4. Click Copy Output to copy the result to your clipboard.

Common Use Cases