Overview
Paste a Base64 string (with a MIME type selected) or a full data URI to get a CSS-ready `url("data:...;base64,...")` value, plus a complete `background-image` declaration you can paste directly into a stylesheet. If a full data URI is pasted, its own embedded MIME type is used automatically instead of the selector. This tool only constructs the CSS reference from the Base64 payload you provide - it doesn’t validate that the underlying bytes form a real, well-formed asset of that type, since that would require actually decoding and rendering it (the Base64 Image Converter does that for images specifically). Useful for quickly wrapping an existing Base64 payload into the exact CSS syntax needed, without hand-typing the `url()` and `data:` boilerplate. Runs entirely client-side; nothing you paste is ever uploaded.
Best for: Wrapping an existing Base64 payload into a ready-to-paste CSS background-image rule
How to use this tool
- Paste Base64 or a data URI. Select a MIME type if pasting bare Base64 - a full data URI carries its own.
- CSS value constructed. A `url("data:<mime>;base64,...")` value is built immediately.
- Full declaration included. A ready-to-paste `background-image: url(...);` line is generated alongside it.
- Copy either one. Grab just the url() value or the full declaration with one click.
Why use this tool
No boilerplate to hand-type
Skips manually assembling the data: URI and url() wrapper syntax.
Data URI MIME auto-detected
Pasting a full data URI uses its own embedded MIME type automatically.
Explicit about its scope
Clearly does not validate the underlying asset - only constructs the CSS reference.
Nothing leaves your browser
Runs entirely client-side.
Frequently asked questions
No - it only builds the CSS syntax around whatever Base64 payload you provide. To confirm a Base64 string actually decodes to a valid, renderable image, use the Base64 Image Converter instead, which previews the decoded result.
Match it to the actual asset the Base64 came from - image/png or image/jpeg for photos, image/svg+xml for SVG markup, font/woff2 for a web font, and so on. If you pasted a full data URI, the selector is ignored and the URI’s own embedded MIME type is used instead.