Base64 to Image

Base64 to Image Converter is a free online tool that decodes a Base64-encoded string and renders it as a viewable image. Paste any valid Base64 image string — with or without the data URI prefix — and the tool instantly displays the decoded image and provides a download link. Whether you are debugging a web application, extracting an embedded image from source code, or verifying that a Base64 string encodes a valid image, this tool gives you an immediate visual result.

Base64 image strings appear in many places in modern web development and data exchange. HTML src attributes with data URIs start with data:image/png;base64, or data:image/jpeg;base64, followed by the encoded image data. CSS background-image properties use the same format. JSON API responses that return image data sometimes encode it as Base64 rather than returning a file URL — particularly for small images, thumbnails, or dynamically generated content. Email templates with embedded images store image data as Base64 attachments within the HTML body. Database records that store image data directly rather than file paths often use Base64 encoding.

A complete data URI follows the format: data:[MIME type];base64,[encoded data]. The MIME type indicates what kind of file the data represents — image/png for PNG files, image/jpeg for JPEG, image/gif for GIF, image/webp for WebP, and image/svg+xml for SVG. Our tool accepts Base64 strings both with and without the data URI prefix — it auto-detects the format and handles both cases. If you have a raw Base64 string without a prefix, the tool attempts to determine the image format from the binary signature (magic bytes) in the decoded data.

One of the most practical uses is debugging web applications. When inspecting network requests or API responses in browser DevTools, you may encounter Base64-encoded images in JSON payloads, localStorage values, or IndexedDB records. Pasting the string here instantly shows you what image it contains — saving you the time of writing code to decode and render it. When reviewing HTML or CSS source with embedded data URIs, this tool lets you quickly visualise what each encoded image looks like without rendering the full page.

Content migrators and web scrapers sometimes need to extract embedded images from HTML files. Rather than writing a parsing script to decode data URIs and save the resulting files, pasting each Base64 string here and clicking download handles small-scale extractions in seconds. Email developers use it to verify that images embedded in HTML email templates are encoded correctly and display as intended before sending. QA engineers use it to verify that Base64 image data returned by APIs matches the expected image content.

The decoder supports all common image MIME types: image/jpeg, image/png, image/gif, image/webp, image/svg+xml, and image/bmp. When downloading the decoded image, the tool uses the MIME type from the data URI prefix to set the correct file extension. If no MIME type is present, the tool inspects the binary signature of the decoded data — JPEG files begin with FF D8 FF, PNG files begin with 89 50 4E 47, and so on — to determine the format automatically.

Base64 to Image Converter uses JavaScript's atob() function to decode the Base64 string into binary data, then constructs a Blob object with the appropriate MIME type. The Blob is used to create an object URL assigned to an img element for display. A download link is generated from the same Blob URL so you can save the decoded image file directly. All processing happens in your browser — no data is sent to any server and no strings are stored.