What is a Base64 Image Decoder?
A Base64 image decoder converts Base64-encoded strings back into their original image format. Base64 encoding is widely used to embed images directly into HTML, CSS, or JSON files. You can validate any Base64 string before decoding, or head the other way with the Base64 image encoder.
How to Decode a Base64 Image
Paste your Base64 string above and click Decode Image — that's it. To decode Base64 to image, the tool strips any data:image/…;base64, prefix, validates the characters, and rebuilds the original bytes with the browser's native atob() function. No signup, no server round-trip, no file size limit imposed by an upload.
Base64 Image Viewer — Preview Without Downloading
Need to just look at what a Base64 string contains? This page works as a standalone Base64 image viewer: decode the string and the image renders immediately in the preview pane, with its format and file size shown below it. Use Open in New Tab to view it full-size, or Download Image only if you need to keep a copy.
What Image Formats Are Supported?
PNG, JPEG, GIF, WebP, SVG, and BMP. The format is automatically detected from the data URI prefix (e.g., data:image/png;base64,) or from binary file signatures. Need a specific output format instead? Try Base64 to PNG, Base64 to JPEG, or Base64 to SVG.
Frequently Asked Questions
How do I decode a Base64 image?
Paste the Base64 string into the text area above and click Decode Image. The tool validates the string, detects the image format, and shows a preview you can download.
How do I view a Base64 image without downloading it?
This page doubles as a Base64 image viewer — paste your string and click Decode Image to preview it instantly in the browser. Use Open in New Tab to view it full-size without saving a file.
Is my data safe?
Yes. This tool runs entirely in your browser. No data is uploaded to any server.
Can I decode without the data URI prefix?
Yes. Paste the full data URI or just the raw Base64 string — the tool handles both.
Why is my string showing an error?
Errors occur if the string is malformed or contains invalid characters. Base64 strings should only contain A-Z, a-z, 0-9, +, /, and = (padding).