Matte and Pad Transparent Artwork

Flatten transparent artwork onto a chosen matte and add equal outer padding as one opaque PNG.

Content processing stays in the browser; required runtime code/models load by GET. Retained originals preserve their original bytes and metadata. Local processing and re-encoding are not secure-erasure, redaction or anonymity guarantees.

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About this flow

Flatten transparent artwork onto a chosen matte and add equal outer padding as one opaque PNG.

Limitations

One static PNG/JPEG/WebP,20MiB,4MP,8192pixels per source side.
Opaque PNG with chosen solid matte and equal0-2048pixel padding; dimensions increase and no resize occurs.
Color/alpha are intentionally composited. ICC fidelity and arbitrary-source edge appearance are not guaranteed.
No cut paths, physical size/bleed, printer suitability, secure redaction or anonymity claim.