Base64 Image Decoder — Inspect Base64 Data URIs Online
Base64 Image Decoder parses a Base64 data URI (e.g. data:image/png;base64,...) and extracts the MIME type, approximate byte size, and usage examples for HTML img tags and CSS backgrounds. Useful for understanding embedded images in HTML or CSS source.
Common Use Cases
- Checking the size and type of a Base64-embedded image
- Getting the correct HTML <img> or CSS background-image syntax for a data URI
- Auditing inline images in HTML emails
Frequently Asked Questions
What is a Base64 data URI?
A Base64 data URI embeds a file (like an image) directly in HTML or CSS as a Base64-encoded string, in the format: data:[MIME type];base64,[data]. This avoids a separate HTTP request for the file.
Privacy & Security
This tool runs entirely in your browser using client-side JavaScript. No data is sent to a server — your input never leaves your machine. SmartDevBox has no account system, no usage tracking, and no paid tier. See the Privacy & Security page for full details.
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