Base64 text shows up in plenty of unexpected places: a JSON API response, an old CSS file, an email's embedded images, or a config file someone forwarded you. When what you actually need is a normal image file rather than a wall of encoded characters, a base64 to image converter is the fastest way to get there without writing any code.
Decoding happens entirely in your browser using standard JavaScript string handling, so the text you paste never has to travel anywhere else. A private screenshot embedded as Base64 in a support ticket stays private through the decoding step as much as it did through the original encoding.
When you need to convert base64 to image
The clearest case is receiving image data as text rather than as a file, which happens often with APIs that return Base64 encoded thumbnails or previews directly in a JSON response, saving the API a separate file serving step at the cost of a larger response body.
It is also common when debugging: a CSS file with an inlined background image, an email's raw source with embedded attachments, or a browser's network panel showing a data URI response, all present the image as text first, and pulling it back out as an actual file makes it far easier to inspect, resize or share normally.
- Paste a full data URI, starting with data colon image, and the format is detected automatically.
- Paste just the raw Base64 characters and choose the correct image format yourself.
- Use this to decode base64 image data pulled from an API response or a browser's developer tools.
- Preview the result before downloading, so a mistaken paste is obvious immediately rather than after saving a broken file.
- Download the decoded file with its correct extension, ready to use anywhere a normal image file is expected.
Data URI or raw string, both work
A full data URI looks like data colon image slash png semicolon base64 comma followed by the encoded characters, and it already tells the browser exactly what type of image follows. Paste one of these for a direct data uri to image decode, and the tool reads the mime type from the prefix without asking you anything further.
Sometimes only the raw characters after that comma are available, with no prefix at all, which happens when copying from certain APIs or stripped down config files. In that case you need to choose the format yourself using the selector, since the raw bytes alone do not announce what kind of image they represent.
What can go wrong when you paste base64 string content
The most common failure is pasting text that is not valid Base64 at all, often because whitespace, line breaks or a stray character got included during copying. The decoder will report this clearly rather than producing a corrupted file, since invalid characters make the decoding fail outright rather than silently.
The second common issue is choosing the wrong format for a raw string with no data URI prefix. If the preview does not render or looks wrong, try a different format from the selector, since the same bytes decoded as the wrong type will simply fail to display as a valid image.
How this base64 to image converter works under the hood
The browser's built in atob function reverses the Base64 alphabet back into raw binary data, which is then wrapped in a Blob with the correct mime type and turned into an object URL for preview and download. This is the exact mirror image of how the encoding side of this pair of tools works.
None of this touches a server. The text you paste is processed by JavaScript running in your own tab, and you can confirm that by watching your browser's network panel while decoding, where no request carrying the string will appear.
Downloading the decoded image
Once decoded, the image previews immediately so you can confirm it is what you expected before saving anything. The download button then saves it with the correct file extension for the format you selected or detected, ready to open, edit or upload anywhere a normal file is expected.
If you need to go back to Base64 afterward, perhaps after resizing or editing the decoded file, the reverse converter on this site handles that direction using the same local, upload free approach.
How to convert Base64 to an image
- 1
Paste the Base64 text
Paste a full data URI or a raw Base64 string into the text box.
- 2
Choose the format if needed
If you pasted a raw string with no data URI prefix, select the correct image format.
- 3
Decode and preview
Press decode and check the preview against what you expected to see.
- 4
Download the image
Save the decoded file with the correct extension for its format.
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Sources and further reading
- MDN: Window.atobThe browser API this converter uses to decode a Base64 string back to binary.developer.mozilla.org
- RFC 4648: The Base16, Base32, and Base64 Data EncodingsThe official specification defining the Base64 alphabet this tool decodes.rfc-editor.org
- WHATWG: URL StandardThe specification covering how a data colon URL is structured and parsed.url.spec.whatwg.org
Frequently asked questions
Common questions about the base64 to image converter.
A data URI includes a prefix like data colon image slash png semicolon base64 comma that tells software exactly what format follows, while a raw string is just the encoded characters with no such label. This tool detects the format automatically from a data URI, but needs you to pick it manually for a raw string.
The most common cause is text that is not valid Base64, often from whitespace, line breaks or extra characters picked up during copying. Removing anything before the actual encoded characters and trying again usually resolves it, since the decoder needs a clean, unbroken string.
No. The decoding happens entirely in your browser using the built in atob function, and the text you paste is never transmitted to a server. You can confirm this by watching your browser's network panel while decoding and seeing no outgoing request.
If you know where the Base64 came from, that usually tells you the format directly. Otherwise, try PNG first since it is the most common, and check the preview. If it fails to render or looks corrupted, try JPG, WebP or another common format until the preview appears correctly.
Yes. Many APIs return image thumbnails or previews as a Base64 string directly inside a JSON response. Copy just that string value, paste it here, choose the format the API documented, and download the resulting file as a normal image.
Yes. Base64 encoding and decoding is lossless, it is simply a different textual representation of the exact same bytes. The decoded file is byte for byte identical to whatever image was encoded in the first place, with no quality change of any kind.