diff --git a/src/app/(dashboard)/[portSlug]/admin/branding/page.tsx b/src/app/(dashboard)/[portSlug]/admin/branding/page.tsx
index 19bebc66..7ef3d850 100644
--- a/src/app/(dashboard)/[portSlug]/admin/branding/page.tsx
+++ b/src/app/(dashboard)/[portSlug]/admin/branding/page.tsx
@@ -3,6 +3,7 @@ import {
   type SettingFieldDef,
 } from '@/components/admin/shared/settings-form-card';
 import { PageHeader } from '@/components/shared/page-header';
+import { PdfLogoUploader } from '@/components/admin/branding/pdf-logo-uploader';
 
 const DEFAULT_EMAIL_HEADER_HTML = `<!-- Optional pre-body header -->
 <table role="presentation" width="100%" cellpadding="0" cellspacing="0" style="border-collapse:collapse;">
@@ -87,6 +88,7 @@ export default function BrandingSettingsPage() {
         description="HTML fragments rendered around every transactional email."
         fields={FIELDS.slice(3)}
       />
+      <PdfLogoUploader />
     </div>
   );
 }
diff --git a/src/app/api/v1/admin/branding/logo/route.ts b/src/app/api/v1/admin/branding/logo/route.ts
new file mode 100644
index 00000000..320fd4f1
--- /dev/null
+++ b/src/app/api/v1/admin/branding/logo/route.ts
@@ -0,0 +1,132 @@
+import { NextResponse } from 'next/server';
+
+import { withAuth, withPermission } from '@/lib/api/helpers';
+import { errorResponse, ValidationError } from '@/lib/errors';
+import {
+  clearPortLogo,
+  getPortLogoFile,
+  processLogoUpload,
+  setPortLogo,
+  type LogoCrop,
+} from '@/lib/services/logo.service';
+import { env } from '@/lib/env';
+
+const MAX_RAW_BYTES = 5 * 1024 * 1024;
+
+function parseCrop(value: FormDataEntryValue | null): LogoCrop | undefined {
+  if (typeof value !== 'string' || value.length === 0) return undefined;
+  let parsed: unknown;
+  try {
+    parsed = JSON.parse(value);
+  } catch {
+    throw new ValidationError('Invalid crop JSON');
+  }
+  if (!parsed || typeof parsed !== 'object') {
+    throw new ValidationError('Invalid crop payload');
+  }
+  const c = parsed as Record<string, unknown>;
+  for (const key of ['x', 'y', 'width', 'height']) {
+    if (typeof c[key] !== 'number' || !Number.isFinite(c[key])) {
+      throw new ValidationError(`Crop ${key} must be a finite number`);
+    }
+  }
+  return {
+    x: c.x as number,
+    y: c.y as number,
+    width: c.width as number,
+    height: c.height as number,
+  };
+}
+
+/**
+ * GET /api/v1/admin/branding/logo
+ * Returns metadata for the current port logo (or null).
+ */
+export const GET = withAuth(
+  withPermission('admin', 'manage_settings', async (_req, ctx) => {
+    try {
+      if (!ctx.portId) throw new ValidationError('No active port');
+      const file = await getPortLogoFile(ctx.portId);
+      if (!file) {
+        return NextResponse.json({ data: null });
+      }
+      const baseUrl = env.APP_URL.replace(/\/+$/, '');
+      return NextResponse.json({
+        data: {
+          fileId: file.id,
+          previewUrl: `${baseUrl}/api/v1/files/${file.id}/preview`,
+          sizeBytes: file.sizeBytes,
+          mimeType: file.mimeType,
+        },
+      });
+    } catch (error) {
+      return errorResponse(error);
+    }
+  }),
+);
+
+/**
+ * POST /api/v1/admin/branding/logo
+ *
+ * Multipart: `file` (required) + `crop` (optional JSON string `{x, y, width, height}`).
+ * Runs the sharp normalization pipeline; if accepted, atomically updates the
+ * `port_logo_file_id` system setting and soft-archives the previous logo.
+ */
+export const POST = withAuth(
+  withPermission('admin', 'manage_settings', async (req, ctx) => {
+    try {
+      if (!ctx.portId) throw new ValidationError('No active port');
+      const formData = await req.formData();
+      const fileEntry = formData.get('file');
+      if (!(fileEntry instanceof File)) throw new ValidationError('Missing `file` part');
+      if (fileEntry.size === 0) throw new ValidationError('Empty file');
+      if (fileEntry.size > MAX_RAW_BYTES) {
+        throw new ValidationError(`File exceeds ${MAX_RAW_BYTES / 1024 / 1024} MB`);
+      }
+      const crop = parseCrop(formData.get('crop'));
+      const buffer = Buffer.from(await fileEntry.arrayBuffer());
+      const processed = await processLogoUpload(buffer, crop);
+      const result = await setPortLogo(ctx.portId, processed, {
+        userId: ctx.userId,
+        portId: ctx.portId,
+        ipAddress: ctx.ipAddress,
+        userAgent: ctx.userAgent,
+      });
+      const baseUrl = env.APP_URL.replace(/\/+$/, '');
+      return NextResponse.json({
+        data: {
+          fileId: result.fileId,
+          previewUrl: `${baseUrl}/api/v1/files/${result.fileId}/preview`,
+          warnings: result.warnings,
+          finalDimensions: processed.finalDimensions,
+          finalBytes: processed.finalBytes,
+          originalDimensions: processed.originalDimensions,
+          originalFormat: processed.originalFormat,
+        },
+      });
+    } catch (error) {
+      return errorResponse(error);
+    }
+  }),
+);
+
+/**
+ * DELETE /api/v1/admin/branding/logo
+ * Clear the port logo. Subsequent PDF renders fall back to the port-name text header.
+ */
+export const DELETE = withAuth(
+  withPermission('admin', 'manage_settings', async (_req, ctx) => {
+    try {
+      if (!ctx.portId) throw new ValidationError('No active port');
+      await clearPortLogo(ctx.portId, {
+        userId: ctx.userId,
+        portId: ctx.portId,
+        ipAddress: ctx.ipAddress,
+        userAgent: ctx.userAgent,
+      });
+      return new NextResponse(null, { status: 204 });
+    } catch (error) {
+      return errorResponse(error);
+    }
+  }),
+);
diff --git a/src/app/api/v1/admin/branding/logo/sample-pdf/route.tsx b/src/app/api/v1/admin/branding/logo/sample-pdf/route.tsx
new file mode 100644
index 00000000..e591d0cc
--- /dev/null
+++ b/src/app/api/v1/admin/branding/logo/sample-pdf/route.tsx
@@ -0,0 +1,42 @@
+import { NextResponse } from 'next/server';
+import { eq } from 'drizzle-orm';
+
+import { withAuth, withPermission } from '@/lib/api/helpers';
+import { db } from '@/lib/db';
+import { ports } from '@/lib/db/schema/ports';
+import { errorResponse, ValidationError } from '@/lib/errors';
+import { resolvePortLogo } from '@/lib/pdf/brand-kit/logo';
+import { renderPdf } from '@/lib/pdf/render';
+import { BrandingSamplePdf } from '@/lib/pdf/templates/branding-sample';
+
+/**
+ * GET /api/v1/admin/branding/logo/sample-pdf
+ *
+ * Renders a one-page PDF that exercises the brand-kit header, footer, and a
+ * couple of tables/charts. Used by the admin Branding UI's "Test with sample
+ * PDF" button so the admin can preview their logo in the actual report shell
+ * before generating real reports.
+ */
+export const GET = withAuth(
+  withPermission('admin', 'manage_settings', async (_req, ctx) => {
+    try {
+      if (!ctx.portId) throw new ValidationError('No active port');
+      const port = await db.query.ports.findFirst({ where: eq(ports.id, ctx.portId) });
+      if (!port) throw new ValidationError('Unknown port');
+      const logo = await resolvePortLogo(port.id);
+      const bytes = await renderPdf(
+        <BrandingSamplePdf portName={port.name} logoBuffer={logo.buffer} />,
+      );
+      return new NextResponse(new Uint8Array(bytes), {
+        status: 200,
+        headers: {
+          'content-type': 'application/pdf',
+          'content-disposition': 'inline; filename="branding-sample.pdf"',
+          'cache-control': 'no-store',
+        },
+      });
+    } catch (error) {
+      return errorResponse(error);
+    }
+  }),
+);
diff --git a/src/components/admin/branding/pdf-logo-uploader.tsx b/src/components/admin/branding/pdf-logo-uploader.tsx
new file mode 100644
index 00000000..33ea0b65
--- /dev/null
+++ b/src/components/admin/branding/pdf-logo-uploader.tsx
@@ -0,0 +1,340 @@
+'use client';
+
+import 'react-image-crop/dist/ReactCrop.css';
+
+import { useEffect, useRef, useState } from 'react';
+import ReactCrop, { centerCrop, makeAspectCrop, type Crop, type PixelCrop } from 'react-image-crop';
+import { Loader2, RefreshCw, Trash2, Upload } from 'lucide-react';
+
+import { Button } from '@/components/ui/button';
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
+import { Label } from '@/components/ui/label';
+import { toastError } from '@/lib/api/toast-error';
+import { toast } from 'sonner';
+
+const ACCEPT = 'image/png,image/jpeg,image/webp,image/svg+xml,image/heic,image/heif,image/avif';
+
+type AspectMode = 'wide' | 'square' | 'freeform';
+
+const ASPECT_RATIOS: Record<AspectMode, number | undefined> = {
+  wide: 3,
+  square: 1,
+  freeform: undefined,
+};
+
+interface CurrentLogo {
+  fileId: string;
+  previewUrl: string;
+  sizeBytes: string | null;
+  mimeType: string | null;
+}
+
+interface UploadResult {
+  fileId: string;
+  previewUrl: string;
+  warnings: string[];
+  finalDimensions: { width: number; height: number };
+  finalBytes: number;
+  originalDimensions: { width: number; height: number };
+  originalFormat: string;
+}
+
+const WARNING_LABELS: Record<string, string> = {
+  trimmed: 'Auto-trimmed whitespace borders',
+  resized: 'Downscaled for size',
+  'no-alpha': 'No transparent background — will show a white box on dark headers',
+  'jpeg-source': 'JPEG source — prefer PNG with alpha for crisp rendering',
+  'svg-rasterized': 'SVG rasterized to PNG at 300 DPI',
+  'heic-converted': 'HEIC/HEIF converted to PNG',
+  'webp-converted': 'WebP converted to PNG',
+};
+
+function centeredCrop(width: number, height: number, aspect: number): Crop {
+  return centerCrop(makeAspectCrop({ unit: '%', width: 90 }, aspect, width, height), width, height);
+}
+
+export function PdfLogoUploader() {
+  const [current, setCurrent] = useState<CurrentLogo | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [working, setWorking] = useState(false);
+  const [file, setFile] = useState<File | null>(null);
+  const [objectUrl, setObjectUrl] = useState<string | null>(null);
+  const [crop, setCrop] = useState<Crop>();
+  const [completedCrop, setCompletedCrop] = useState<PixelCrop | null>(null);
+  const [aspectMode, setAspectMode] = useState<AspectMode>('wide');
+  const [warnings, setWarnings] = useState<string[]>([]);
+  const [uploadInfo, setUploadInfo] = useState<UploadResult | null>(null);
+  const imgRef = useRef<HTMLImageElement | null>(null);
+  const fileInputRef = useRef<HTMLInputElement | null>(null);
+
+  useEffect(() => {
+    void refresh();
+  }, []);
+
+  useEffect(() => {
+    return () => {
+      if (objectUrl) URL.revokeObjectURL(objectUrl);
+    };
+  }, [objectUrl]);
+
+  async function refresh() {
+    setLoading(true);
+    try {
+      const res = await fetch('/api/v1/admin/branding/logo');
+      if (!res.ok) throw new Error(`GET ${res.status}`);
+      const body = (await res.json()) as { data: CurrentLogo | null };
+      setCurrent(body.data ?? null);
+    } catch (err) {
+      toastError(err);
+    } finally {
+      setLoading(false);
+    }
+  }
+
+  function pick(f: File | null) {
+    if (!f) return;
+    if (objectUrl) URL.revokeObjectURL(objectUrl);
+    const url = URL.createObjectURL(f);
+    setFile(f);
+    setObjectUrl(url);
+    setCrop(undefined);
+    setCompletedCrop(null);
+    setWarnings([]);
+    setUploadInfo(null);
+  }
+
+  function onImageLoad(e: React.SyntheticEvent<HTMLImageElement>) {
+    const { naturalWidth: w, naturalHeight: h } = e.currentTarget;
+    const aspect = ASPECT_RATIOS[aspectMode];
+    if (aspect) setCrop(centeredCrop(w, h, aspect));
+  }
+
+  function changeAspect(mode: AspectMode) {
+    setAspectMode(mode);
+    const img = imgRef.current;
+    const aspect = ASPECT_RATIOS[mode];
+    if (img && aspect) {
+      setCrop(centeredCrop(img.naturalWidth, img.naturalHeight, aspect));
+    } else {
+      setCrop(undefined);
+    }
+  }
+
+  async function upload() {
+    if (!file) return;
+    setWorking(true);
+    try {
+      const fd = new FormData();
+      fd.append('file', file);
+      if (completedCrop && completedCrop.width > 0 && completedCrop.height > 0) {
+        fd.append(
+          'crop',
+          JSON.stringify({
+            x: completedCrop.x,
+            y: completedCrop.y,
+            width: completedCrop.width,
+            height: completedCrop.height,
+          }),
+        );
+      }
+      const res = await fetch('/api/v1/admin/branding/logo', { method: 'POST', body: fd });
+      const body = (await res.json()) as { data: UploadResult } | { error?: { message?: string } };
+      if (!res.ok) {
+        const message = ('error' in body && body.error?.message) || `Upload failed (${res.status})`;
+        throw new Error(message);
+      }
+      const data = (body as { data: UploadResult }).data;
+      setUploadInfo(data);
+      setWarnings(data.warnings ?? []);
+      toast.success('Logo saved');
+      await refresh();
+      // Clear the local crop staging so the preview now shows the stored logo.
+      setFile(null);
+      if (objectUrl) URL.revokeObjectURL(objectUrl);
+      setObjectUrl(null);
+    } catch (err) {
+      toastError(err);
+    } finally {
+      setWorking(false);
+    }
+  }
+
+  async function clear() {
+    if (!confirm('Remove the PDF logo? Future reports will fall back to the port name.')) return;
+    setWorking(true);
+    try {
+      const res = await fetch('/api/v1/admin/branding/logo', { method: 'DELETE' });
+      if (!res.ok && res.status !== 204) throw new Error(`DELETE ${res.status}`);
+      toast.success('Logo removed');
+      setCurrent(null);
+      setUploadInfo(null);
+      setWarnings([]);
+    } catch (err) {
+      toastError(err);
+    } finally {
+      setWorking(false);
+    }
+  }
+
+  function openSamplePdf() {
+    window.open('/api/v1/admin/branding/logo/sample-pdf', '_blank');
+  }
+
+  return (
+    <Card>
+      <CardHeader>
+        <CardTitle>PDF logo</CardTitle>
+        <CardDescription>
+          Used as the header logo on every internal PDF the CRM generates (reports, expense sheets,
+          record exports). Separate from the email/UI logo so PDFs can have a higher-resolution,
+          alpha-channel version optimized for print.
+        </CardDescription>
+      </CardHeader>
+      <CardContent className="space-y-6">
+        <div className="rounded-md bg-muted/40 p-4 text-sm text-muted-foreground space-y-1">
+          <p>Use PNG or SVG with a transparent background.</p>
+          <p>Minimum 200×200px; recommended 600×200px (wide) or 400×400px (square).</p>
+          <p>Max 5MB; we&apos;ll auto-trim, downscale, and convert to PNG.</p>
+          <p>Avoid JPEGs unless the background is solid white.</p>
+        </div>
+
+        {loading ? (
+          <div className="flex items-center gap-2 text-sm text-muted-foreground">
+            <Loader2 className="h-4 w-4 animate-spin" /> Loading current logo…
+          </div>
+        ) : current ? (
+          <div className="flex items-start gap-4 rounded-md border p-4">
+            <div className="flex h-20 w-44 items-center justify-center rounded bg-[#0f172a] p-2">
+              {/* eslint-disable-next-line @next/next/no-img-element */}
+              <img
+                src={current.previewUrl}
+                alt="Current PDF logo on dark header"
+                className="max-h-full max-w-full object-contain"
+              />
+            </div>
+            <div className="flex-1 space-y-1">
+              <div className="text-sm font-medium">Current logo</div>
+              <div className="text-xs text-muted-foreground">
+                {current.sizeBytes
+                  ? `${(Number(current.sizeBytes) / 1024).toFixed(1)} KB`
+                  : 'size unknown'}{' '}
+                · {current.mimeType ?? 'image'}
+              </div>
+              <div className="flex gap-2 pt-2">
+                <Button variant="outline" size="sm" onClick={openSamplePdf}>
+                  Test with sample PDF
+                </Button>
+                <Button variant="outline" size="sm" onClick={clear} disabled={working}>
+                  <Trash2 className="mr-1 h-3 w-3" /> Remove
+                </Button>
+              </div>
+            </div>
+          </div>
+        ) : (
+          <div className="rounded-md border border-dashed p-4 text-sm text-muted-foreground">
+            No PDF logo configured yet. Reports use the port name as a text header.
+          </div>
+        )}
+
+        <div className="space-y-2">
+          <Label>Upload a new logo</Label>
+          <input
+            ref={fileInputRef}
+            type="file"
+            accept={ACCEPT}
+            onChange={(e) => pick(e.target.files?.[0] ?? null)}
+            className="block w-full text-sm file:mr-3 file:rounded file:border-0 file:bg-primary file:px-3 file:py-1.5 file:text-sm file:font-medium file:text-primary-foreground"
+          />
+        </div>
+
+        {objectUrl ? (
+          <div className="space-y-4 rounded-md border p-4">
+            <div className="flex items-center gap-2 text-sm">
+              <span>Crop:</span>
+              {(['wide', 'square', 'freeform'] as const).map((m) => (
+                <button
+                  type="button"
+                  key={m}
+                  onClick={() => changeAspect(m)}
+                  className={`rounded border px-2 py-0.5 text-xs capitalize ${
+                    aspectMode === m
+                      ? 'border-primary bg-primary text-primary-foreground'
+                      : 'border-input hover:bg-accent'
+                  }`}
+                >
+                  {m === 'wide' ? 'Wide 3:1' : m === 'square' ? 'Square 1:1' : 'Freeform'}
+                </button>
+              ))}
+            </div>
+            <ReactCrop
+              crop={crop}
+              onChange={(_c, percent) => setCrop(percent)}
+              onComplete={(c) => setCompletedCrop(c)}
+              aspect={ASPECT_RATIOS[aspectMode]}
+              className="max-h-[400px]"
+            >
+              {/* eslint-disable-next-line @next/next/no-img-element */}
+              <img
+                ref={imgRef}
+                src={objectUrl}
+                alt="Logo to crop"
+                onLoad={onImageLoad}
+                className="max-h-[400px]"
+              />
+            </ReactCrop>
+            <div className="flex gap-2">
+              <Button onClick={upload} disabled={working}>
+                {working ? (
+                  <Loader2 className="mr-1 h-3 w-3 animate-spin" />
+                ) : (
+                  <Upload className="mr-1 h-3 w-3" />
+                )}
+                Save logo
+              </Button>
+              <Button
+                variant="outline"
+                onClick={() => {
+                  setFile(null);
+                  if (objectUrl) URL.revokeObjectURL(objectUrl);
+                  setObjectUrl(null);
+                  setCrop(undefined);
+                  setCompletedCrop(null);
+                }}
+                disabled={working}
+              >
+                Cancel
+              </Button>
+              <Button
+                variant="ghost"
+                onClick={() => fileInputRef.current?.click()}
+                disabled={working}
+              >
+                <RefreshCw className="mr-1 h-3 w-3" /> Choose a different file
+              </Button>
+            </div>
+          </div>
+        ) : null}
+
+        {uploadInfo ? (
+          <div className="rounded-md border p-4 text-sm space-y-2">
+            <div className="font-medium">Processed</div>
+            <div className="text-xs text-muted-foreground">
+              From {uploadInfo.originalFormat.toUpperCase()} {uploadInfo.originalDimensions.width}×
+              {uploadInfo.originalDimensions.height}
+              {' → '}
+              PNG {uploadInfo.finalDimensions.width}×{uploadInfo.finalDimensions.height} (
+              {(uploadInfo.finalBytes / 1024).toFixed(1)} KB)
+            </div>
+            {warnings.length > 0 ? (
+              <ul className="list-disc space-y-0.5 pl-5 text-xs">
+                {warnings.map((w) => (
+                  <li key={w}>{WARNING_LABELS[w] ?? w}</li>
+                ))}
+              </ul>
+            ) : null}
+          </div>
+        ) : null}
+      </CardContent>
+    </Card>
+  );
+}
diff --git a/src/lib/audit.ts b/src/lib/audit.ts
index 2a5b0b88..4a2b2a89 100644
--- a/src/lib/audit.ts
+++ b/src/lib/audit.ts
@@ -26,6 +26,9 @@ export type AuditAction =
   | 'view'
   | 'request_hard_delete_code'
   | 'hard_delete'
+  // Branding (port logo upload pipeline).
+  | 'branding.logo.uploaded'
+  | 'branding.logo.archived'
   // System / background events.
   | 'webhook_delivered'
   | 'webhook_failed'
diff --git a/src/lib/pdf/templates/branding-sample.tsx b/src/lib/pdf/templates/branding-sample.tsx
new file mode 100644
index 00000000..1d7ace08
--- /dev/null
+++ b/src/lib/pdf/templates/branding-sample.tsx
@@ -0,0 +1,87 @@
+import {
+  BarChart,
+  DataTable,
+  DocumentShell,
+  KeyValueGrid,
+  PieChart,
+  Section,
+} from '@/lib/pdf/brand-kit';
+
+export interface BrandingSamplePdfProps {
+  portName: string;
+  logoBuffer: Buffer | null;
+}
+
+const SAMPLE_BARS = [
+  { label: 'Mon', value: 14 },
+  { label: 'Tue', value: 22 },
+  { label: 'Wed', value: 18 },
+  { label: 'Thu', value: 27 },
+  { label: 'Fri', value: 31 },
+  { label: 'Sat', value: 9 },
+  { label: 'Sun', value: 5 },
+];
+
+const SAMPLE_PIE = [
+  { label: 'Available', value: 42 },
+  { label: 'Under Offer', value: 12 },
+  { label: 'Sold', value: 38 },
+];
+
+interface SampleRow {
+  date: string;
+  action: string;
+  who: string;
+}
+
+const SAMPLE_ROWS: SampleRow[] = [
+  { date: '2026-05-12', action: 'created client', who: 'Sarah K.' },
+  { date: '2026-05-12', action: 'sent EOI', who: 'Matt P.' },
+  { date: '2026-05-11', action: 'updated berth A12', who: 'Sarah K.' },
+  { date: '2026-05-11', action: 'archived interest', who: 'James R.' },
+];
+
+/**
+ * One-page sample PDF used by the admin Branding UI's "Test with sample PDF"
+ * button. Exercises every brand-kit primitive a real report would touch so an
+ * admin can sanity-check their logo placement, font/color rendering, header
+ * letterboxing, and footer page numbering at a glance.
+ */
+export function BrandingSamplePdf({ portName, logoBuffer }: BrandingSamplePdfProps) {
+  return (
+    <DocumentShell
+      portName={portName}
+      docTitle="Branding Sample"
+      docMeta="Generated to verify your port logo and design tokens"
+      logoBuffer={logoBuffer}
+      pdfTitle="Branding Sample"
+    >
+      <Section title="Summary" subtitle="A glance at how the brand kit renders in real reports.">
+        <KeyValueGrid
+          rows={[
+            { label: 'Port', value: portName },
+            { label: 'Logo source', value: logoBuffer ? 'Configured' : 'Fallback (text)' },
+            { label: 'Page size', value: 'A4' },
+            { label: 'Color scheme', value: 'Slate header · Blue accent' },
+          ]}
+        />
+      </Section>
+      <Section title="Bar chart" subtitle="Sample weekly activity counts.">
+        <BarChart data={SAMPLE_BARS} showValues />
+      </Section>
+      <Section title="Pie chart" subtitle="Sample berth status mix.">
+        <PieChart data={SAMPLE_PIE} innerRadiusRatio={0.5} />
+      </Section>
+      <Section title="Table" subtitle="Recent sample events.">
+        <DataTable<SampleRow>
+          columns={[
+            { header: 'Date', flex: 1, render: (r) => r.date },
+            { header: 'Action', flex: 2, render: (r) => r.action },
+            { header: 'Who', flex: 1, render: (r) => r.who },
+          ]}
+          rows={SAMPLE_ROWS}
+        />
+      </Section>
+    </DocumentShell>
+  );
+}
diff --git a/src/lib/services/logo.service.ts b/src/lib/services/logo.service.ts
new file mode 100644
index 00000000..00115328
--- /dev/null
+++ b/src/lib/services/logo.service.ts
@@ -0,0 +1,328 @@
+/**
+ * Port-logo upload service.
+ *
+ * Layer 1 of the design (`docs/superpowers/specs/2026-05-12-pdf-stack-overhaul-design.md`):
+ * sharp normalization + svgo sanitization + atomic system_settings upsert +
+ * audit logging. Single entry point for the admin upload endpoint and the
+ * branding-preview endpoint. Returns processed bytes + the file row, plus a
+ * collected list of warnings the UI surfaces in the preview swatch.
+ */
+
+import { and, eq } from 'drizzle-orm';
+import sharp from 'sharp';
+import { optimize as svgoOptimize } from 'svgo';
+
+import { db } from '@/lib/db';
+import { files } from '@/lib/db/schema/documents';
+import { systemSettings } from '@/lib/db/schema/system';
+import { ports } from '@/lib/db/schema/ports';
+import { createAuditLog, type AuditMeta } from '@/lib/audit';
+import { ValidationError } from '@/lib/errors';
+import { getStorageBackend } from '@/lib/storage';
+import { generateStorageKey } from '@/lib/services/storage';
+import { logger } from '@/lib/logger';
+import { PORT_LOGO_SETTING_KEY } from '@/lib/pdf/brand-kit/logo';
+
+const MAX_RAW_BYTES = 5 * 1024 * 1024;
+const MAX_FINAL_BYTES = 1 * 1024 * 1024;
+const MIN_DIMENSION = 200;
+const TARGET_LONG_EDGE = 1200;
+const SVG_RASTER_DENSITY = 300;
+
+const SUPPORTED_INPUT_FORMATS = new Set([
+  'png',
+  'jpeg',
+  'jpg',
+  'webp',
+  'svg',
+  'heic',
+  'heif',
+  'avif',
+]);
+
+export type LogoWarning =
+  | 'trimmed'
+  | 'resized'
+  | 'no-alpha'
+  | 'jpeg-source'
+  | 'svg-rasterized'
+  | 'heic-converted'
+  | 'webp-converted';
+
+export interface LogoCrop {
+  /** Crop coordinates in raw-image pixel units. */
+  x: number;
+  y: number;
+  width: number;
+  height: number;
+}
+
+export interface ProcessLogoResult {
+  pngBuffer: Buffer;
+  warnings: LogoWarning[];
+  originalFormat: string;
+  originalDimensions: { width: number; height: number };
+  finalDimensions: { width: number; height: number };
+  finalBytes: number;
+}
+
+function sanitizeSvg(rawSvg: string): string {
+  // preset-default strips <script>, event handlers, and unused elements.
+  // The post-pass regex check below is belt-and-suspenders for the
+  // attack surface we explicitly disallow.
+  const result = svgoOptimize(rawSvg, {
+    multipass: true,
+    plugins: ['preset-default'],
+  });
+  const sanitized = result.data;
+  if (
+    /<script\b/i.test(sanitized) ||
+    /<foreignobject\b/i.test(sanitized) ||
+    /\bon\w+\s*=/i.test(sanitized) ||
+    /javascript:/i.test(sanitized) ||
+    /\bhref\s*=\s*["']https?:/i.test(sanitized)
+  ) {
+    throw new ValidationError(
+      'SVG contained disallowed nodes (script/foreignObject/external href)',
+    );
+  }
+  return sanitized;
+}
+
+/**
+ * Runs the full sharp normalization pipeline. Throws ValidationError on
+ * unsupported formats, undersized dimensions, oversized output, or animated
+ * inputs. Caller passes the original upload buffer and optional crop coords.
+ */
+export async function processLogoUpload(raw: Buffer, crop?: LogoCrop): Promise<ProcessLogoResult> {
+  if (raw.length === 0) throw new ValidationError('Empty file');
+  if (raw.length > MAX_RAW_BYTES) {
+    throw new ValidationError(`File exceeds ${MAX_RAW_BYTES / 1024 / 1024} MB`);
+  }
+
+  const warnings: LogoWarning[] = [];
+
+  // Detect format up front so we can route SVGs through svgo first.
+  let probe: sharp.Metadata;
+  try {
+    probe = await sharp(raw).metadata();
+  } catch (err) {
+    logger.warn({ err }, 'logo upload: sharp could not read metadata');
+    throw new ValidationError('File contents do not match a supported image format');
+  }
+  const format = probe.format ?? 'unknown';
+  if (!SUPPORTED_INPUT_FORMATS.has(format)) {
+    throw new ValidationError(`Unsupported image format: ${format}`);
+  }
+  if ((probe.pages ?? 1) > 1) {
+    throw new ValidationError('Animated/multi-frame images are not accepted');
+  }
+
+  let workingBuffer = raw;
+
+  if (format === 'svg') {
+    const sanitized = sanitizeSvg(raw.toString('utf8'));
+    workingBuffer = Buffer.from(sanitized, 'utf8');
+    warnings.push('svg-rasterized');
+  } else if (format === 'heif' || format === 'avif') {
+    warnings.push('heic-converted');
+  } else if (format === 'webp') {
+    warnings.push('webp-converted');
+  } else if (format === 'jpeg') {
+    warnings.push('jpeg-source');
+    if (!probe.hasAlpha) warnings.push('no-alpha');
+  }
+
+  const baseSharp =
+    format === 'svg' ? sharp(workingBuffer, { density: SVG_RASTER_DENSITY }) : sharp(workingBuffer);
+
+  // Apply crop if provided, after validating bounds against the original metadata.
+  let pipeline = baseSharp;
+  if (crop) {
+    const w = probe.width ?? 0;
+    const h = probe.height ?? 0;
+    if (
+      crop.x < 0 ||
+      crop.y < 0 ||
+      crop.width <= 0 ||
+      crop.height <= 0 ||
+      crop.x + crop.width > w ||
+      crop.y + crop.height > h
+    ) {
+      throw new ValidationError('Crop coordinates out of image bounds');
+    }
+    pipeline = pipeline.extract({
+      left: Math.round(crop.x),
+      top: Math.round(crop.y),
+      width: Math.round(crop.width),
+      height: Math.round(crop.height),
+    });
+  }
+
+  // Trim near-white borders (only for raster; SVG has none).
+  if (format !== 'svg') {
+    pipeline = pipeline.trim({ threshold: 10 });
+    warnings.push('trimmed');
+  }
+
+  pipeline = pipeline
+    .resize({
+      width: TARGET_LONG_EDGE,
+      height: TARGET_LONG_EDGE,
+      fit: 'inside',
+      withoutEnlargement: true,
+    })
+    .toColorspace('srgb')
+    .png({ compressionLevel: 9, palette: true });
+
+  const pngBuffer = await pipeline.toBuffer();
+  const finalMeta = await sharp(pngBuffer).metadata();
+  const fw = finalMeta.width ?? 0;
+  const fh = finalMeta.height ?? 0;
+  if (fw < MIN_DIMENSION || fh < MIN_DIMENSION) {
+    throw new ValidationError(
+      `Logo is too small after trim (${fw}x${fh}). Minimum ${MIN_DIMENSION}px per side.`,
+    );
+  }
+  if (pngBuffer.length > MAX_FINAL_BYTES) {
+    throw new ValidationError(
+      `Processed logo exceeds ${MAX_FINAL_BYTES / 1024 / 1024} MB. Try a simpler source image.`,
+    );
+  }
+  if (probe.width && fw < probe.width) warnings.push('resized');
+
+  return {
+    pngBuffer,
+    warnings,
+    originalFormat: format,
+    originalDimensions: { width: probe.width ?? 0, height: probe.height ?? 0 },
+    finalDimensions: { width: fw, height: fh },
+    finalBytes: pngBuffer.length,
+  };
+}
+
+/**
+ * Persist the processed logo: write to storage backend, insert files row,
+ * upsert system_settings pointer atomically, soft-delete the prior file row.
+ * Last-writer-wins; concurrent uploads do not race because the system_settings
+ * upsert is atomic.
+ */
+export async function setPortLogo(
+  portId: string,
+  processed: ProcessLogoResult,
+  meta: AuditMeta,
+): Promise<{ fileId: string; storagePath: string; warnings: LogoWarning[] }> {
+  const port = await db.query.ports.findFirst({ where: eq(ports.id, portId) });
+  if (!port) throw new ValidationError('Unknown port');
+
+  const storagePath = generateStorageKey(port.slug, 'branding', port.id, 'image/png');
+  const backend = await getStorageBackend();
+  await backend.put(storagePath, processed.pngBuffer, {
+    contentType: 'image/png',
+    sizeBytes: processed.pngBuffer.length,
+  });
+
+  const prior = await readCurrentLogoFileId(portId);
+
+  const [record] = await db
+    .insert(files)
+    .values({
+      portId,
+      filename: 'port-logo.png',
+      originalName: 'port-logo.png',
+      mimeType: 'image/png',
+      sizeBytes: String(processed.pngBuffer.length),
+      storagePath,
+      category: 'branding',
+      uploadedBy: meta.userId,
+    })
+    .returning();
+  if (!record) throw new Error('files insert returned no row');
+
+  await db
+    .insert(systemSettings)
+    .values({
+      key: PORT_LOGO_SETTING_KEY,
+      value: record.id,
+      portId,
+      updatedBy: meta.userId,
+    })
+    .onConflictDoUpdate({
+      target: [systemSettings.key, systemSettings.portId],
+      set: { value: record.id, updatedBy: meta.userId, updatedAt: new Date() },
+    });
+
+  void createAuditLog({
+    userId: meta.userId,
+    portId,
+    action: 'branding.logo.uploaded',
+    entityType: 'port',
+    entityId: portId,
+    newValue: {
+      fileId: record.id,
+      finalDimensions: processed.finalDimensions,
+      finalBytes: processed.finalBytes,
+      warnings: processed.warnings,
+      originalFormat: processed.originalFormat,
+    },
+    ipAddress: meta.ipAddress,
+    userAgent: meta.userAgent,
+  });
+
+  if (prior && prior !== record.id) {
+    await purgePriorLogo(prior, portId, meta);
+  }
+
+  return { fileId: record.id, storagePath, warnings: processed.warnings };
+}
+
+async function readCurrentLogoFileId(portId: string): Promise<string | null> {
+  const [row] = await db
+    .select()
+    .from(systemSettings)
+    .where(and(eq(systemSettings.key, PORT_LOGO_SETTING_KEY), eq(systemSettings.portId, portId)));
+  if (!row) return null;
+  return typeof row.value === 'string' ? row.value : null;
+}
+
+async function purgePriorLogo(fileId: string, portId: string, meta: AuditMeta): Promise<void> {
+  const file = await db.query.files.findFirst({ where: eq(files.id, fileId) });
+  if (!file) return;
+  try {
+    const backend = await getStorageBackend();
+    await backend.delete(file.storagePath);
+  } catch (err) {
+    logger.warn({ err, fileId, storagePath: file.storagePath }, 'prior logo storage purge failed');
+  }
+  await db.delete(files).where(eq(files.id, fileId));
+  void createAuditLog({
+    userId: meta.userId,
+    portId,
+    action: 'branding.logo.archived',
+    entityType: 'port',
+    entityId: portId,
+    oldValue: { fileId, storagePath: file.storagePath },
+    ipAddress: meta.ipAddress,
+    userAgent: meta.userAgent,
+  });
+}
+
+/** Clear the port logo. Removes the storage object + files row + setting. */
+export async function clearPortLogo(portId: string, meta: AuditMeta): Promise<void> {
+  const prior = await readCurrentLogoFileId(portId);
+  if (!prior) return;
+  await db
+    .delete(systemSettings)
+    .where(and(eq(systemSettings.key, PORT_LOGO_SETTING_KEY), eq(systemSettings.portId, portId)));
+  await purgePriorLogo(prior, portId, meta);
+}
+
+/** Read the current port logo file row (or null) for admin UI display. */
+export async function getPortLogoFile(portId: string) {
+  const fileId = await readCurrentLogoFileId(portId);
+  if (!fileId) return null;
+  const file = await db.query.files.findFirst({
+    where: and(eq(files.id, fileId), eq(files.portId, portId)),
+  });
+  return file ?? null;
+}
diff --git a/tests/unit/logo-service.test.ts b/tests/unit/logo-service.test.ts
new file mode 100644
index 00000000..da814dd3
--- /dev/null
+++ b/tests/unit/logo-service.test.ts
@@ -0,0 +1,106 @@
+/**
+ * Pure-function tests for the logo sharp pipeline (no DB / storage).
+ * The `setPortLogo` write-path is exercised by integration tests + Playwright.
+ */
+
+import { describe, expect, it } from 'vitest';
+import sharp from 'sharp';
+
+import { processLogoUpload } from '@/lib/services/logo.service';
+
+async function makePng(
+  w: number,
+  h: number,
+  color: { r: number; g: number; b: number; alpha: number } = { r: 255, g: 0, b: 0, alpha: 1 },
+) {
+  return sharp({ create: { width: w, height: h, channels: 4, background: color } })
+    .png()
+    .toBuffer();
+}
+
+describe('processLogoUpload — sharp pipeline', () => {
+  it('accepts a healthy PNG with alpha and resizes if needed', async () => {
+    const buf = await makePng(2400, 800);
+    const result = await processLogoUpload(buf);
+    expect(result.originalFormat).toBe('png');
+    expect(result.finalDimensions.width).toBeLessThanOrEqual(1200);
+    expect(result.finalDimensions.height).toBeLessThanOrEqual(1200);
+    expect(result.pngBuffer.subarray(1, 4).toString('ascii')).toBe('PNG');
+    expect(result.warnings).toContain('trimmed');
+    expect(result.warnings).toContain('resized');
+  });
+
+  it('rejects undersized images', async () => {
+    const buf = await makePng(100, 100);
+    await expect(processLogoUpload(buf)).rejects.toThrow(/too small/i);
+  });
+
+  it('rejects empty buffers', async () => {
+    await expect(processLogoUpload(Buffer.alloc(0))).rejects.toThrow(/empty/i);
+  });
+
+  it('rejects buffers that exceed the raw size cap', async () => {
+    // 6 MB of zero bytes — fails the raw size cap before sharp parses.
+    const buf = Buffer.alloc(6 * 1024 * 1024);
+    await expect(processLogoUpload(buf)).rejects.toThrow(/MB/i);
+  });
+
+  it('rejects non-image bytes', async () => {
+    const buf = Buffer.from('this is not an image at all');
+    await expect(processLogoUpload(buf)).rejects.toThrow(/supported image format/i);
+  });
+
+  it('rejects out-of-bounds crop coordinates', async () => {
+    const buf = await makePng(800, 800);
+    await expect(processLogoUpload(buf, { x: 0, y: 0, width: 1000, height: 1000 })).rejects.toThrow(
+      /out of image bounds/i,
+    );
+  });
+
+  it('accepts an in-bounds crop', async () => {
+    const buf = await makePng(800, 800);
+    const result = await processLogoUpload(buf, { x: 100, y: 100, width: 500, height: 500 });
+    expect(result.finalDimensions.width).toBeGreaterThan(0);
+  });
+
+  it('rasterizes SVG input to PNG', async () => {
+    const svg = `<svg xmlns="http://www.w3.org/2000/svg" width="400" height="400" viewBox="0 0 400 400">
+      <rect width="400" height="400" fill="#1d4ed8"/>
+      <circle cx="200" cy="200" r="100" fill="#ffffff"/>
+    </svg>`;
+    const buf = Buffer.from(svg, 'utf8');
+    const result = await processLogoUpload(buf);
+    expect(result.originalFormat).toBe('svg');
+    expect(result.warnings).toContain('svg-rasterized');
+    // Output is PNG even though input was SVG.
+    expect(result.pngBuffer.subarray(1, 4).toString('ascii')).toBe('PNG');
+  });
+
+  it('rejects SVG with embedded script', async () => {
+    const svg = `<svg xmlns="http://www.w3.org/2000/svg" width="400" height="400">
+      <script>alert('xss')</script>
+      <rect width="400" height="400" fill="#1d4ed8"/>
+    </svg>`;
+    const buf = Buffer.from(svg, 'utf8');
+    await expect(processLogoUpload(buf)).rejects.toThrow(/disallowed nodes/i);
+  });
+
+  it('rejects SVG with external href', async () => {
+    const svg = `<svg xmlns="http://www.w3.org/2000/svg" width="400" height="400">
+      <image href="https://evil.example.com/x.png" width="400" height="400"/>
+    </svg>`;
+    const buf = Buffer.from(svg, 'utf8');
+    await expect(processLogoUpload(buf)).rejects.toThrow(/disallowed nodes/i);
+  });
+
+  it('flags JPEG sources with no alpha', async () => {
+    const buf = await sharp({
+      create: { width: 1200, height: 1200, channels: 3, background: { r: 200, g: 50, b: 50 } },
+    })
+      .jpeg({ quality: 80 })
+      .toBuffer();
+    const result = await processLogoUpload(buf);
+    expect(result.warnings).toContain('jpeg-source');
+    expect(result.warnings).toContain('no-alpha');
+  });
+});
diff --git a/tests/unit/pdf-brand-kit.test.tsx b/tests/unit/pdf-brand-kit.test.tsx
index 8c864267..6777ee50 100644
--- a/tests/unit/pdf-brand-kit.test.tsx
+++ b/tests/unit/pdf-brand-kit.test.tsx
@@ -67,14 +67,10 @@ describe('pdf brand kit', () => {
         </Section>
         <Section title="Table">
           <Badge text="Active" tone="success" />
-          <DataTable
+          <DataTable<{ name: string; score: number }>
             columns={[
-              { header: 'Name', render: (r: { name: string }) => r.name },
-              {
-                header: 'Score',
-                align: 'right',
-                render: (r: { score: number }) => String(r.score),
-              },
+              { header: 'Name', render: (r) => r.name },
+              { header: 'Score', align: 'right', render: (r) => String(r.score) },
             ]}
             rows={[
               { name: 'Alpha', score: 1 },