Base64 to Image Converter

What this tool does

Images hidden inside JSON, HTML, CSS or emails are often just Base64 text, and the label in front of them is not always right. This converter decodes the text and looks at the first bytes of the file, the signature every format starts with, so a PNG is recognised even without a data: prefix, and a JPEG mislabelled as PNG is flagged. It accepts the URL-safe variant with - and _, line breaks and missing = padding. PNG, JPEG, GIF, WebP, BMP, ICO and SVG are shown and can be saved; anything else, such as a PDF, can still be downloaded. Decoding happens on this page, so nothing is sent anywhere.

Formula

4 Base64 characters → 3 bytes ; the file type is read from the first bytes (PNG 89 50 4E 47, JPEG FF D8 FF, GIF 47 49 46, WebP RIFF…WEBP)

Variables

Worked example

Limitations

• The calculation runs entirely in your browser. The values you type are never sent to a server.