diff --git a/modules/customer-invoices/src/web/proformas/detail/controllers/use-proforma-detail-page-controller.ts b/modules/customer-invoices/src/web/proformas/detail/controllers/use-proforma-detail-page-controller.ts
index e061061e..168872d6 100644
--- a/modules/customer-invoices/src/web/proformas/detail/controllers/use-proforma-detail-page-controller.ts
+++ b/modules/customer-invoices/src/web/proformas/detail/controllers/use-proforma-detail-page-controller.ts
@@ -276,12 +276,36 @@ export const useProformaDetailPageController = () => {
     });
   };
 
-  const handleOpenPreviewPdf = () => {
-    if (!previewPdfUrl) {
+  const handleOpenPreviewPdf = async () => {
+    if (previewPdfUrl) {
+      window.open(previewPdfUrl, "_blank", "noopener,noreferrer");
       return;
     }
 
-    window.open(previewPdfUrl, "_blank", "noopener,noreferrer");
+    const result = await previewPdfQuery.refetch();
+
+    if (result.error) {
+      showErrorToast(
+        t("proformas.detail.document.error_title"),
+        result.error instanceof Error ? result.error.message : t("proformas.detail.document.error")
+      );
+      return;
+    }
+
+    if (!isUsablePdfBlob(result.data)) {
+      showErrorToast(
+        t("proformas.detail.document.empty_title"),
+        t("proformas.detail.document.empty_description")
+      );
+      return;
+    }
+
+    const objectUrl = URL.createObjectURL(result.data);
+    window.open(objectUrl, "_blank", "noopener,noreferrer");
+
+    window.setTimeout(() => {
+      URL.revokeObjectURL(objectUrl);
+    }, 60_000);
   };
 
   const handlePrintPreview = () => {
@@ -379,6 +403,7 @@ export const useProformaDetailPageController = () => {
         changeStatus: t("pages.proformas.list.actions.change_status"),
         issue: t("pages.proformas.list.actions.issue"),
         duplicate: t("pages.proformas.list.actions.duplicate"),
+        openPdf: t("proformas.detail.document.actions.open"),
         downloadPdf: t("pages.proformas.list.actions.download_pdf"),
         archive: t("pages.proformas.list.actions.archive"),
         unarchive: t("pages.proformas.list.actions.unarchive"),
@@ -398,6 +423,7 @@ export const useProformaDetailPageController = () => {
       loading: {
         issue: issueDialogCtrl.isSubmitting,
         duplicate: duplicateMutation.isPending,
+        "open-pdf": previewPdfQuery.isFetching && !previewPdfBlob,
         "download-pdf": previewPdfQuery.isFetching && !previewPdfBlob,
         archive: archiveMutation.isPending,
         unarchive: unarchiveMutation.isPending,
@@ -438,6 +464,14 @@ export const useProformaDetailPageController = () => {
       case "duplicate":
         handleDuplicate();
         return;
+      case "open-pdf":
+        handleOpenPreviewPdf().catch((error: unknown) => {
+          showErrorToast(
+            t("proformas.detail.document.error_title"),
+            error instanceof Error ? error.message : t("proformas.detail.document.error")
+          );
+        });
+        return;
       case "download-pdf":
         handleDownload();
         return;
diff --git a/modules/customer-invoices/src/web/proformas/detail/entities/proforma-detail-view-models.entity.ts b/modules/customer-invoices/src/web/proformas/detail/entities/proforma-detail-view-models.entity.ts
index 102dc405..0431f92e 100644
--- a/modules/customer-invoices/src/web/proformas/detail/entities/proforma-detail-view-models.entity.ts
+++ b/modules/customer-invoices/src/web/proformas/detail/entities/proforma-detail-view-models.entity.ts
@@ -135,6 +135,7 @@ export type ProformaDetailActionKey =
   | "change-status"
   | "issue"
   | "duplicate"
+  | "open-pdf"
   | "download-pdf"
   | "archive"
   | "unarchive";
diff --git a/modules/customer-invoices/src/web/proformas/detail/ui/blocks/proforma-detail-header-actions.tsx b/modules/customer-invoices/src/web/proformas/detail/ui/blocks/proforma-detail-header-actions.tsx
index 5d1f6d51..48aa32ba 100644
--- a/modules/customer-invoices/src/web/proformas/detail/ui/blocks/proforma-detail-header-actions.tsx
+++ b/modules/customer-invoices/src/web/proformas/detail/ui/blocks/proforma-detail-header-actions.tsx
@@ -10,6 +10,7 @@ import {
   CopyIcon,
   DownloadIcon,
   FileOutputIcon,
+  ExternalLinkIcon,
   MoreHorizontalIcon,
   PencilIcon,
   RefreshCwIcon,
@@ -30,9 +31,7 @@ export const ProformaDetailHeaderActions = ({
   onExecuteAction,
 }: ProformaDetailHeaderActionsProps) => {
   const { t } = useTranslation();
-  const visibleItems = actions.items.filter(
-    (item) => item.visibility === "visible" && item.key !== "download-pdf"
-  );
+  const visibleItems = actions.items.filter((item) => item.visibility === "visible");
   const primaryAction = visibleItems.find((item) => item.placement === "primary") ?? null;
   const secondaryActions = visibleItems.filter((item) => item.placement === "secondary");
   const menuActions = visibleItems.filter((item) => item.placement === "menu");
@@ -45,6 +44,8 @@ export const ProformaDetailHeaderActions = ({
         return FileOutputIcon;
       case "duplicate":
         return CopyIcon;
+      case "open-pdf":
+        return ExternalLinkIcon;
       case "download-pdf":
         return DownloadIcon;
       case "archive":
diff --git a/modules/customer-invoices/src/web/proformas/detail/ui/blocks/proforma-document-pane.tsx b/modules/customer-invoices/src/web/proformas/detail/ui/blocks/proforma-document-pane.tsx
index dd2dd5ba..81799eb1 100644
--- a/modules/customer-invoices/src/web/proformas/detail/ui/blocks/proforma-document-pane.tsx
+++ b/modules/customer-invoices/src/web/proformas/detail/ui/blocks/proforma-document-pane.tsx
@@ -1,7 +1,7 @@
 import { PDFViewer } from "@repo/rdx-ui/components";
 import { Alert, AlertDescription, AlertTitle, Button } from "@repo/shadcn-ui/components";
 import { cn } from "@repo/shadcn-ui/lib/utils";
-import { useId } from "react";
+import { useEffect, useId, useState } from "react";
 
 import { useTranslation } from "../../../../i18n";
 import type { ProformaDetailDocumentState, ProformaDetailDocumentViewModel } from "../../entities";
@@ -25,22 +25,51 @@ export const ProformaDocumentPane = ({
 }: ProformaDocumentPaneProps) => {
   const { t } = useTranslation();
   const headingId = useId();
+  const [isDesktopViewport, setIsDesktopViewport] = useState(() =>
+    typeof window === "undefined" ? false : window.matchMedia("(min-width: 1024px)").matches
+  );
+  const supportsNativeInlinePdf =
+    typeof navigator !== "undefined" && navigator.pdfViewerEnabled === true;
+  const shouldUseNativeInlinePdf = supportsNativeInlinePdf && isDesktopViewport;
   const isRefreshing = state.isFetching && Boolean(document.src);
   const shouldRenderBlockingError = state.isError && !document.src;
   const shouldRenderStaleError = state.isError && Boolean(document.src);
 
+  useEffect(() => {
+    if (typeof window === "undefined") {
+      return;
+    }
+
+    const mediaQuery = window.matchMedia("(min-width: 1024px)");
+    const handleChange = (event: MediaQueryListEvent) => {
+      setIsDesktopViewport(event.matches);
+    };
+
+    setIsDesktopViewport(mediaQuery.matches);
+    mediaQuery.addEventListener("change", handleChange);
+
+    return () => {
+      mediaQuery.removeEventListener("change", handleChange);
+    };
+  }, []);
+
   return (
     <section
       aria-labelledby={headingId}
       className="min-w-0 overflow-visible border-b bg-muted/30 lg:min-h-0 lg:overflow-hidden lg:border-b-0"
     >
-      <div className="h-full min-h-0 p-4 sm:p-6">
+      <div
+        className={cn(
+          "h-full min-h-0",
+          shouldUseNativeInlinePdf ? "flex flex-col overflow-hidden p-0" : "p-2 sm:p-4 lg:p-6"
+        )}
+      >
         <h2 className="sr-only" id={headingId}>
           {document.title}
         </h2>
 
         {shouldRenderStaleError ? (
-          <Alert className="mb-4">
+          <Alert className={cn(shouldUseNativeInlinePdf ? "m-4 mb-0 shrink-0" : "mb-4")}>
             <AlertTitle>{t("proformas.detail.document.error_title")}</AlertTitle>
             <AlertDescription className="space-y-3">
               <p>{state.errorMessage ?? t("proformas.detail.document.error")}</p>
@@ -55,7 +84,8 @@ export const ProformaDocumentPane = ({
 
         <PDFViewer
           className={cn(
-            "min-h-[32rem] overflow-hidden border-border/80 bg-background shadow-none lg:h-full lg:min-h-full"
+            "min-h-[56svh] overflow-hidden border-border/80 bg-background shadow-none sm:min-h-[32rem] lg:h-full lg:min-h-full",
+            shouldUseNativeInlinePdf && "flex-1 min-h-0"
           )}
           defaultZoom="fit"
           description={document.description}
@@ -81,8 +111,12 @@ export const ProformaDocumentPane = ({
           onOpen={onOpen}
           onPrint={onPrint}
           onRetry={onRetry}
+          showDownloadAction={false}
+          showOpenAction={false}
+          showPrinterAction={false}
           src={document.src}
           title={document.title}
+          variant={shouldUseNativeInlinePdf ? "native-inline" : "panel"}
         />
       </div>
     </section>
diff --git a/modules/customer-invoices/src/web/proformas/detail/utils/build-proforma-detail-actions.ts b/modules/customer-invoices/src/web/proformas/detail/utils/build-proforma-detail-actions.ts
index d1c8f7ba..8721207d 100644
--- a/modules/customer-invoices/src/web/proformas/detail/utils/build-proforma-detail-actions.ts
+++ b/modules/customer-invoices/src/web/proformas/detail/utils/build-proforma-detail-actions.ts
@@ -11,6 +11,7 @@ export interface ProformaDetailActionLabels {
   changeStatus: string;
   issue: string;
   duplicate: string;
+  openPdf: string;
   downloadPdf: string;
   archive: string;
   unarchive: string;
@@ -120,10 +121,19 @@ export const buildProformaDetailActions = ({
       loading.duplicate ?? false,
       null
     ),
+    buildAction(
+      "open-pdf",
+      labels.openPdf,
+      "secondary",
+      "visible",
+      !(loading["open-pdf"] ?? false),
+      loading["open-pdf"] ?? false,
+      loading["open-pdf"] ? labels.disabledReasons.operationInProgress : null
+    ),
     buildAction(
       "download-pdf",
       labels.downloadPdf,
-      isApproved ? "secondary" : "secondary",
+      "secondary",
       "visible",
       !(loading["download-pdf"] ?? false),
       loading["download-pdf"] ?? false,
diff --git a/packages/rdx-ui/src/components/pdf-viewer.tsx b/packages/rdx-ui/src/components/pdf-viewer.tsx
index b7a3ba99..cd6571c9 100644
--- a/packages/rdx-ui/src/components/pdf-viewer.tsx
+++ b/packages/rdx-ui/src/components/pdf-viewer.tsx
@@ -11,6 +11,7 @@ import {
   SelectValue,
   Spinner,
 } from "@repo/shadcn-ui/components";
+import { cn } from "@repo/shadcn-ui/lib/utils";
 import {
   DownloadIcon,
   ExternalLinkIcon,
@@ -47,6 +48,10 @@ type PDFViewerProps = {
   title?: string;
   description?: string;
   className?: string;
+  variant?: "panel" | "native-inline";
+  showOpenAction?: boolean;
+  showDownloadAction?: boolean;
+  showPrinterAction?: boolean;
   loading?: boolean;
   isRefreshing?: boolean;
   error?: string | null;
@@ -71,6 +76,10 @@ export function PDFViewer({
   title = "Vista previa",
   description = "Documento PDF embebido en la pantalla.",
   className,
+  variant = "panel",
+  showOpenAction = true,
+  showDownloadAction = true,
+  showPrinterAction = true,
   loading = false,
   isRefreshing = false,
   error = null,
@@ -87,6 +96,8 @@ export function PDFViewer({
   const [zoom, setZoom] = useState<string>(() =>
     defaultZoom === FIT_ZOOM_VALUE ? FIT_ZOOM_VALUE : String(clampZoom(defaultZoom, zoomOptions))
   );
+  const minZoom = Math.min(...zoomOptions);
+  const maxZoom = Math.max(...zoomOptions);
   const resolvedLabels: PDFViewerLabels = {
     zoomOut: "Alejar",
     zoomIn: "Acercar",
@@ -109,9 +120,13 @@ export function PDFViewer({
       return null;
     }
 
+    if (variant === "native-inline") {
+      return src;
+    }
+
     const separator = src.includes("#") ? "&" : "#";
-    return `${src}${separator}toolbar=0&navpanes=0&scrollbar=1&view=FitH`;
-  }, [src]);
+    return `${src}${separator}toolbar=0&navpanes=0&scrollbar=1&page=1&zoom=page-width`;
+  }, [src, variant]);
 
   useEffect(() => {
     if (zoom !== FIT_ZOOM_VALUE) {
@@ -127,13 +142,9 @@ export function PDFViewer({
       const styles = window.getComputedStyle(element);
       const paddingX =
         Number.parseFloat(styles.paddingLeft) + Number.parseFloat(styles.paddingRight);
-      const paddingY =
-        Number.parseFloat(styles.paddingTop) + Number.parseFloat(styles.paddingBottom);
       const availableWidth = Math.max(element.clientWidth - paddingX, 320);
-      const availableHeight = Math.max(element.clientHeight - paddingY, 320);
       const widthScale = availableWidth / PDF_PAGE_WIDTH;
-      const heightScale = availableHeight / PDF_PAGE_HEIGHT;
-      const nextScale = Math.min(widthScale, heightScale, 1);
+      const nextScale = Math.min(widthScale, maxZoom / 100);
       setFitZoom(Math.max(Math.round(nextScale * 100), 25));
     };
 
@@ -147,12 +158,11 @@ export function PDFViewer({
       observer.disconnect();
       window.removeEventListener("resize", updateFitZoom);
     };
-  }, [zoom]);
+  }, [maxZoom, zoom]);
 
   const effectiveZoom = zoom === FIT_ZOOM_VALUE ? fitZoom : Number(zoom);
   const zoomScale = effectiveZoom / 100;
-  const minZoom = Math.min(...zoomOptions);
-  const maxZoom = Math.max(...zoomOptions);
+  const scaledPageHeight = PDF_PAGE_HEIGHT * zoomScale;
 
   const handleOpen = () => {
     if (onOpen) {
@@ -192,6 +202,97 @@ export function PDFViewer({
     }
   };
 
+  const viewerContent = (
+    <FormSectionGrid
+      className={cn("gap-y-6 md:grid-cols-1", variant === "native-inline" && "h-full")}
+    >
+      <div
+        className={cn(
+          "flex-1 overflow-auto bg-muted p-1.5 sm:p-3 md:p-5",
+          variant === "native-inline" && "flex h-full min-h-0 flex-col bg-transparent p-0 md:p-0"
+        )}
+        ref={viewportRef}
+      >
+        {loading ? (
+          <div className="flex h-full min-h-[480px] items-center justify-center rounded-xl border border-dashed bg-background/80">
+            <div className="flex items-center gap-3 text-sm text-muted-foreground">
+              <Spinner className="size-4" />
+              {resolvedLabels.loading}
+            </div>
+          </div>
+        ) : null}
+
+        {!loading && error ? (
+          <div className="flex h-full min-h-[480px] items-center justify-center rounded-xl border border-dashed bg-background/80 px-6 text-center">
+            <Alert className="max-w-md text-left">
+              <AlertTitle>{resolvedLabels.errorTitle}</AlertTitle>
+              <AlertDescription className="space-y-4">
+                <p>{error}</p>
+                {onRetry ? (
+                  <Button onClick={onRetry} type="button" variant="outline">
+                    {resolvedLabels.retry}
+                  </Button>
+                ) : null}
+              </AlertDescription>
+            </Alert>
+          </div>
+        ) : null}
+
+        {!(loading || error) && resolvedSrc ? (
+          <div
+            className={cn(
+              "mx-auto flex min-h-full justify-center",
+              variant === "native-inline" && "flex-1 min-h-0 w-full"
+            )}
+            style={variant === "native-inline" ? undefined : { minHeight: `${scaledPageHeight}px` }}
+          >
+            {variant === "native-inline" ? (
+              <iframe
+                className="h-full min-h-0 w-full bg-background"
+                src={resolvedSrc}
+                style={{ border: "0" }}
+                title={title}
+              />
+            ) : (
+              <div
+                className="origin-top overflow-hidden rounded-lg border border-black/8 bg-white shadow-[0_10px_30px_rgba(15,23,42,0.10),0_2px_8px_rgba(15,23,42,0.06)] transition-transform"
+                style={{
+                  transform: `scale(${zoomScale})`,
+                  transformOrigin: "top center",
+                  width: `${PDF_PAGE_WIDTH}px`,
+                }}
+              >
+                <iframe
+                  className="block w-full bg-white"
+                  src={resolvedSrc}
+                  style={{ border: "0", height: `${PDF_PAGE_HEIGHT}px` }}
+                  title={title}
+                />
+              </div>
+            )}
+          </div>
+        ) : null}
+
+        {loading || error || resolvedSrc ? null : (
+          <div className="flex h-full min-h-[480px] items-center justify-center rounded-xl border border-dashed bg-background/80 px-6 text-center">
+            <div className="space-y-2">
+              <p className="font-medium text-foreground">{resolvedLabels.emptyTitle}</p>
+              <p className="text-sm text-muted-foreground">{resolvedLabels.emptyDescription}</p>
+            </div>
+          </div>
+        )}
+      </div>
+    </FormSectionGrid>
+  );
+
+  if (variant === "native-inline") {
+    return (
+      <div className={cn("flex h-full min-h-[32rem] min-h-0 flex-col", className)}>
+        {viewerContent}
+      </div>
+    );
+  }
+
   return (
     <FormSectionCard
       actions={
@@ -248,31 +349,37 @@ export function PDFViewer({
             <ZoomInIcon className="size-4" />
           </Button>
 
-          <Button disabled={loading || !src} onClick={handleOpen} type="button" variant="outline">
-            <ExternalLinkIcon className="mr-2 size-4" />
-            {resolvedLabels.open}
-          </Button>
+          {showOpenAction ? (
+            <Button disabled={loading || !src} onClick={handleOpen} type="button" variant="outline">
+              <ExternalLinkIcon className="mr-2 size-4" />
+              {resolvedLabels.open}
+            </Button>
+          ) : null}
 
-          <Button
-            disabled={loading || !src}
-            onClick={handleDownload}
-            type="button"
-            variant="outline"
-          >
-            <DownloadIcon className="mr-2 size-4" />
-            {resolvedLabels.download}
-          </Button>
+          {showDownloadAction ? (
+            <Button
+              disabled={loading || !src}
+              onClick={handleDownload}
+              type="button"
+              variant="outline"
+            >
+              <DownloadIcon className="mr-2 size-4" />
+              {resolvedLabels.download}
+            </Button>
+          ) : null}
 
-          <Button
-            aria-label={resolvedLabels.print}
-            disabled={loading || !src}
-            onClick={handlePrint}
-            size="icon-sm"
-            type="button"
-            variant="outline"
-          >
-            <PrinterIcon className="size-4" />
-          </Button>
+          {showPrinterAction ? (
+            <Button
+              aria-label={resolvedLabels.print}
+              disabled={loading || !src}
+              onClick={handlePrint}
+              size="icon-sm"
+              type="button"
+              variant="outline"
+            >
+              <PrinterIcon className="size-4" />
+            </Button>
+          ) : null}
 
           {isRefreshing && src ? (
             <div className="inline-flex items-center gap-2 text-sm text-muted-foreground">
@@ -282,71 +389,14 @@ export function PDFViewer({
           ) : null}
         </div>
       }
-      className="shadow-sm"
-      contentClassName="space-y-5"
+      className={cn("shadow-sm", className)}
+      contentClassName="space-y-3 px-2 sm:space-y-4 sm:px-4 md:space-y-5 md:px-6"
       description={description}
+      headerClassName="px-2 sm:px-4 md:px-6"
       icon={<EyeIcon className="size-5" />}
       title={title}
     >
-      <FormSectionGrid className="gap-y-6 md:grid-cols-1">
-        <div className="flex-1 overflow-auto bg-muted p-4 md:p-5" ref={viewportRef}>
-          {loading ? (
-            <div className="flex h-full min-h-[480px] items-center justify-center rounded-xl border border-dashed bg-background/80">
-              <div className="flex items-center gap-3 text-sm text-muted-foreground">
-                <Spinner className="size-4" />
-                {resolvedLabels.loading}
-              </div>
-            </div>
-          ) : null}
-
-          {!loading && error ? (
-            <div className="flex h-full min-h-[480px] items-center justify-center rounded-xl border border-dashed bg-background/80 px-6 text-center">
-              <Alert className="max-w-md text-left">
-                <AlertTitle>{resolvedLabels.errorTitle}</AlertTitle>
-                <AlertDescription className="space-y-4">
-                  <p>{error}</p>
-                  {onRetry ? (
-                    <Button onClick={onRetry} type="button" variant="outline">
-                      {resolvedLabels.retry}
-                    </Button>
-                  ) : null}
-                </AlertDescription>
-              </Alert>
-            </div>
-          ) : null}
-
-          {!(loading || error) && resolvedSrc ? (
-            <div className="mx-auto flex min-h-full justify-center">
-              <div
-                className="origin-top rounded-xl border bg-red-500 shadow-sm transition-transform"
-                style={{
-                  transform: `scale(${zoomScale})`,
-                  transformOrigin: "top center",
-                  width: `${PDF_PAGE_WIDTH}px`,
-                }}
-              >
-                <iframe
-                  className="w-full rounded-xl bg-amber-500"
-                  src={resolvedSrc}
-                  style={{ height: `${PDF_PAGE_HEIGHT}px` }}
-                  title={title}
-                />
-              </div>
-            </div>
-          ) : null}
-
-          {loading || error || resolvedSrc ? null : (
-            <div className="flex h-full min-h-[480px] items-center justify-center rounded-xl border border-dashed bg-background/80 px-6 text-center">
-              <div className="space-y-2">
-                <p className="font-medium text-foreground">{resolvedLabels.emptyTitle}</p>
-                <p className="text-sm text-muted-foreground">
-                  {resolvedLabels.emptyDescription}
-                </p>
-              </div>
-            </div>
-          )}
-        </div>
-      </FormSectionGrid>
+      {viewerContent}
     </FormSectionCard>
   );
 }