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SVG to CSS Mask Converter - Online Create Mask‑image

Developer Tools Image Tool converter CSS mask SVG
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SVG to CSS Mask Converter

Convert any SVG into a CSS mask-image data‑URI in seconds. Drag, paste or upload — then copy the ready‑to‑use code.

SVG Source

Drop SVG file here or click to browse

.svg files up to 5 MB

Try a sample:
CSS Mask Code

This preview uses your generated mask‑image.

/* Your CSS will appear here */

Frequently Asked Questions

The mask-image CSS property applies a transparency mask to an element. Using an SVG lets you create complex, vector‑based masks that stay crisp at any size. Our tool converts your SVG into a data‑URI so you can embed it directly in your stylesheet without extra HTTP requests.

Modern browsers (Chrome 120+, Safari 15.4+, Firefox 53+) support mask-image unprefixed. For older Safari and Chrome versions you should include -webkit-mask-image. Our tool can output both when you check the prefix option.

A data‑URI eliminates the need for a separate file, reduces HTTP requests, and makes your CSS self‑contained. It’s perfect for icon‑sized masks (< 2 KB after compression). For larger, complex SVGs, a file reference might be more cache‑friendly.

Optimize your SVG with tools like SVGO: remove comments, unnecessary precision, editor metadata, and whitespace. Also use simple paths and avoid embedded raster images. A smaller SVG yields a shorter data‑URI and faster parsing.

Yes! SVG animations (SMIL) inside the data‑URI will run in most browsers. However, for complex animations consider linking to an external SVG file to keep your CSS lean and cacheable.

Make sure your SVG uses proper xmlns and the viewBox attribute. For masks, the visible part corresponds to opaque areas (default fill is black). Set fill="white" on elements you want to reveal. Our preview shows instantly, so you can tweak until it’s right.

Pro Tips

  • Use mask-size: contain or cover to control fitting.
  • Combine with mask-repeat and mask-position for patterns.
  • For fixed backgrounds, set mask-attachment: fixed.
  • Test in Safari with -webkit-mask-image for best coverage.

CSS Mask Properties

selector {
  mask-image: url("data:image/svg+xml;base64,...");
  mask-size: contain;
  mask-repeat: no-repeat;
  mask-position: center;
}

Full mask shorthand is also available: mask: url(...) center/contain no-repeat;

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