Data URIs for prototypes—not production galleries
Email templates and inline SVG prototypes sometimes need a tiny logo as data:image/png;base64,... Encoding here confirms the exact string your CMS or markdown renderer will receive.
MIME prefix matters
A complete data URI includes the media type and optional charset before the comma-separated payload. Pasting only raw Base64 without the header may decode in tools but fail in strict HTML parsers.
Reverse decode checks
When an API returns Base64 image JSON, decode locally to verify dimensions and corruption before blaming the mobile client's rendering pipeline.