How to Convert Base64 Back to an Image

A Base64 string is only useful once it's an image again. Here's how to decode one safely, what to check in the result, and how to recognize a truncated payload before it wastes your time.

Paste and decode

Open the Base64 to Image tool and paste the string — a full data URI (`data:image/png;base64,…`) or the raw payload both work. Decoding happens locally, and the tool detects the format from the data URI prefix or the file's signature bytes, then shows the dimensions and file size before you download.

What to check in the preview

The image renders — proof the bytes are a real, decodable image.
The detected format matches what you expected (PNG, JPEG, WebP, GIF, BMP, AVIF or SVG).
Dimensions and size look sane for the source.

When decoding fails

Almost every failure is a truncated or altered string. Base64 payloads end with zero, one or two `=` padding characters — if those are missing, or the string picked up a stray line break mid-payload, decoding breaks. Copy the entire string, from the prefix (if any) through the final character, and try again. A clean tool will tell you exactly which part went wrong instead of silently producing a corrupt file.

For the background — what Base64 is and why the output is a third larger — read What Is Base64 Image Encoding?.

Try it with these tools

Base64 to ImageThe decoder used in this guide.Image to Base64The reverse direction.Image ConverterChange the decoded format.

Guides

How to Convert an Image to Base64

A short, practical walkthrough: encoding an image, reading the data URI, and where to paste it in HTML, CSS and JSON.

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Guides

What Is Base64 Image Encoding?

What Base64 actually does to image data, why data URIs exist, and the size cost that decides when embedding beats linking.