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Base64 To Image

The Base64 to Image Converter decodes Base64 encoded image strings back into viewable, downloadable image files. Paste a Base64 data URL or raw Base64 string and instantly see the decoded image preview. Download the image as PNG, JPG, or the original format. Useful for debugging API responses, inspecting embedded images, and extracting images from code.

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About the Base64 to Image Converter

The Base64 to Image Converter decodes Base64 encoded image strings back into viewable, downloadable image files. Paste a Base64 data URL or raw Base64 string and instantly see the decoded image preview. Download the image as PNG, JPG, or the original format. Useful for debugging API responses, inspecting embedded images, and extracting images from code.

How to use it

  1. Paste the Base64 string (with or without the data: prefix).
  2. The tool decodes and previews the image automatically.
  3. Verify the image looks correct.
  4. Download the image in the desired format.

Formula & methodology

Base64 decoding: each 4-character Base64 group decodes to 3 bytes. Alphabet: A-Z = 0-25, a-z = 26-51, 0-9 = 52-61, + = 62, / = 63. Padding = stripped. Data URL parsing: data:[mime-type];base64,[base64-string] — extract mime-type and base64 body. Raw Base64: detect image type from decoded header bytes (magic bytes: JFIF for JPEG, PNG header for PNG, GIF89a for GIF).

Common use cases

  • Decoding images from API JSON responses for debugging
  • Extracting images embedded in HTML source code
  • Inspecting Base64 images in CSS stylesheets
  • Recovering image files from code where only Base64 remains
  • Testing image encoding/decoding in development

Frequently asked questions

A full Base64 data URL looks like: data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAA... (followed by a very long string of letters, numbers, +, /, and = characters). The data: prefix and MIME type are optional for this converter — you can paste just the base64 body. Typical sizes: a 100x100 PNG thumbnail encoded in Base64 is roughly 3-10KB of text.
Some APIs return generated images (QR codes, charts, thumbnails) as Base64 strings within JSON responses to avoid the complexity of separate binary file endpoints. Email APIs often accept Base64-encoded attachments. Some legacy APIs use Base64 for all binary data. Modern REST APIs more commonly return image URLs or binary streams, but Base64 in JSON is still widely used for simplicity.

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