How to Convert Base64 to Image File in JavaScript

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Summary: Learn how to convert Base64 encoded strings into image files using JavaScript with clear and concise code examples for web development.
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Converting Base64 encoded strings to image files in JavaScript is a common task in web development, especially when dealing with file uploads, data URIs, or API responses. This guide will walk you through the steps to decode a Base64 string and convert it into an image file that can be displayed or downloaded by users.

Understanding Base64 Encoding

Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It is often used to embed image data within HTML or CSS files, or to transmit image data over text-based protocols like JSON or XML.

Step-by-Step Guide to Convert Base64 to Image File

To convert a Base64 string to an image file in JavaScript, follow these steps:

Decode the Base64 String

Create a Blob from the Decoded Data

Generate a URL for the Blob

Display or Download the Image

Decode the Base64 String

First, you need to decode the Base64 string back to binary data. JavaScript provides atob() function for this purpose.

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Create a Blob from the Decoded Data

Next, convert the binary string into a Uint8Array, then use it to create a Blob object. A Blob represents immutable raw data and can be used to represent the image.

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Generate a URL for the Blob

Once you have a Blob, you can create a URL for it using the URL.createObjectURL() method. This URL can be used as the src attribute of an img element or as a link to download the image.

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Display or Download the Image

To display the image, set the src attribute of an img element to the generated URL.

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To download the image, create an a element and set its href attribute to the Blob URL, then trigger a click event.

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Conclusion

By following these steps, you can easily convert Base64 encoded strings to image files using JavaScript. This technique is useful for displaying images directly from Base64 strings and providing users with the ability to download these images.

[ydpvlck]

hey there, after following your steps im still getting this error: InvalidCharacterError: Failed to execute 'atob' on 'Window': The string to be decoded is not correctly encoded. plz help me to fix it..