Base64 to Image Decoder

Base64 image decoding converts a Base64 encoded string back into its original binary image format. This tool automatically detects the image type using magic bytes detection and displays the decoded image in your browser.

This tool automatically detects and supports the major image formats including PNG, JPEG/JPG, GIF, WebP, ICO and SVG.

You can either use:

• Raw Base64 — Just the encoded data (e.g., iVBORw0KGgo...)
• Data URL — Complete data URL format (e.g., data:image/png;base64,iVBORw0KGgo...)
• URL-safe Base64 — Base64 with - and _ characters instead of + and /

The tool automatically normalizes the input, handles missing padding, removes whitespace, and detects the actual image type.

Unlike tools that rely on the data URL's declared MIME type, this decoder analyzes the actual binary content using magic bytes detection:

• PNG files start with 89 50 4E 47
• JPEG files start with FF D8 FF
• GIF files start with GIF87a or GIF89a
• And so on

Yes, there is a size limit on the input to ensure optimal performance. If your Base64 string is too large, you'll receive an error message.

Your data never leaves your browser. All decoding happens locally on your device using JavaScript — nothing is uploaded to any server.