Add Data URI Prefix

Add Data URI Prefix wraps raw Base64 into a valid data: URI, detecting the MIME type from the decoded bytes. It is for developers turning a bare payload into an embeddable data URI.

Raw Base64 is not usable as a source until it has a proper data URI wrapper. Building it locally with the right MIME type makes the payload embeddable, instantly and privately.

1. Paste raw Base64.
2. The MIME type is detected from the decoded bytes.
3. A valid data: URI is produced.
4. Copy it for use as an image source or elsewhere.

• Wraps Base64 into a data URI
• MIME detection from the bytes
• Valid, ready-to-use output
• Runs in the browser — Add Data URI Prefix

• Turning a stored payload back into an embeddable data URI
• Building a data URI to use as an image source
• Reconstructing a URI after the prefix was stripped
• Preparing inlined data for HTML or CSS

• Normalise URL-safe Base64 to standard form before wrapping it.
• Verify the detected MIME type matches the actual content.
• Strip whitespace from the Base64 so the URI stays valid.

• Wrapping Base64 that is actually URL-safe encoded without normalising it first.
• Assuming the detected MIME is always right for ambiguous byte signatures.
• Pasting Base64 with stray whitespace, which can produce an invalid URI.