diff --git a/app/(dashboard)/reward-gifts/page.tsx b/app/(dashboard)/reward-gifts/page.tsx
index 63266e6..dc54740 100644
--- a/app/(dashboard)/reward-gifts/page.tsx
+++ b/app/(dashboard)/reward-gifts/page.tsx
@@ -54,6 +54,26 @@ export default function RewardGiftsPage() {
     }
   };
 
+  const remove = async (reward: GiftableReward) => {
+    if (
+      !window.confirm(
+        `Delete “${reward.name}”? It disappears from the gallery of everyone who has it. Stickers already sent in chats stay put.`,
+      )
+    ) {
+      return;
+    }
+    setSending(reward.key);
+    try {
+      await rewardGifts.remove(reward.key);
+      setCatalog((prev) => prev?.filter((c) => c.key !== reward.key) ?? null);
+      toast.success("Deleted");
+    } catch (err) {
+      toast.error(err instanceof Error ? err.message : "Could not delete");
+    } finally {
+      setSending(null);
+    }
+  };
+
   return (
     <div className="space-y-6">
       <header>
@@ -101,14 +121,29 @@ export default function RewardGiftsPage() {
               <p className="line-clamp-2 text-sm font-medium text-foreground">
                 {r.name}
               </p>
-              <button
-                type="button"
-                disabled={sending !== null}
-                onClick={() => send(r)}
-                className="mt-auto w-full rounded-md bg-primary px-3 py-1.5 text-xs font-medium text-primary-foreground hover:bg-primary/90 disabled:opacity-50"
-              >
-                {sending === r.key ? "Sending…" : "Send to everyone"}
-              </button>
+              <div className="mt-auto w-full space-y-1.5">
+                <button
+                  type="button"
+                  disabled={sending !== null}
+                  onClick={() => send(r)}
+                  className="w-full rounded-md bg-primary px-3 py-1.5 text-xs font-medium text-primary-foreground hover:bg-primary/90 disabled:opacity-50"
+                >
+                  {sending === r.key ? "Sending…" : "Send to everyone"}
+                </button>
+                {/* Seeded rewards have no delete: they would return on the
+                    next seed run, having been taken from the galleries of
+                    everyone who earned them. */}
+                {r.key.startsWith("custom_") && (
+                  <button
+                    type="button"
+                    disabled={sending !== null}
+                    onClick={() => remove(r)}
+                    className="w-full rounded-md border border-border px-3 py-1.5 text-xs text-muted-foreground hover:bg-muted disabled:opacity-50"
+                  >
+                    Delete
+                  </button>
+                )}
+              </div>
             </li>
           ))}
         </ul>
@@ -138,12 +173,23 @@ function CustomGift({
   const upload = async (original: File) => {
     setUploading(true);
     try {
-      // Same compression as the banner: artwork renders at ~120px in the
-      // gallery and small again in a chat bubble, so a full-size original is
-      // wasted bytes on every devotee's device.
-      const file = await compressImage(original, { maxDimension: 512 }).catch(
-        () => original,
-      );
+      // WebP, NOT the helper's default JPEG: JPEG has no alpha channel, and
+      // compress-image paints a white backdrop behind it so transparency
+      // doesn't turn black. A sticker has to keep its cut-out, so it encodes
+      // to a format that has alpha — the white fill is skipped for anything
+      // that isn't JPEG.
+      //
+      // 1024px, not the gallery tile's 120px: the reward detail renders the
+      // artwork at 224 CSS px (rewards-gallery.tsx:184), which is 672 real
+      // pixels on a 3× screen — so anything smaller is upscaled and visibly
+      // soft exactly where the artwork is largest. Quality is raised too:
+      // stickers are flat illustration with hard edges, where WebP's default
+      // ringing shows far more than it does on a photograph.
+      const file = await compressImage(original, {
+        maxDimension: 1024,
+        quality: 0.95,
+        mimeType: "image/webp",
+      }).catch(() => original);
       const { upload_url, image_url } = await rewardGifts.presignImage(
         file.type,
       );
@@ -217,7 +263,9 @@ function CustomGift({
       <div className="flex flex-wrap items-center gap-3">
         <input
           type="file"
-          accept="image/png,image/jpeg,image/webp"
+          // No JPEG: it cannot carry transparency, so it can only produce a
+          // sticker with a hard rectangular edge.
+          accept="image/png,image/webp"
           disabled={uploading}
           onChange={(e) => {
             const f = e.target.files?.[0];
diff --git a/lib/api.ts b/lib/api.ts
index bc399fd..b844d70 100644
--- a/lib/api.ts
+++ b/lib/api.ts
@@ -459,6 +459,12 @@ export const rewardGifts = {
       { method: "POST", body: JSON.stringify({ content_type: contentType }) },
     ).then((r) => r.data),
 
+  /** Delete a custom sticker. Cascades out of every gallery and vault. */
+  remove: (key: string) =>
+    call<void>(`/admin/reward-gifts/${encodeURIComponent(key)}`, {
+      method: "DELETE",
+    }),
+
   /** Add a sticker to the catalog. It reaches nobody until it is sent. */
   create: (input: { name: string; meaning: string; image_url: string }) =>
     call<GiftableReward>("/admin/reward-gifts/catalog", {