diff --git a/remarkbox/lib/pandoc.py b/remarkbox/lib/pandoc.py
index fe22b3f..0cb94cc 100644
--- a/remarkbox/lib/pandoc.py
+++ b/remarkbox/lib/pandoc.py
@@ -216,9 +216,18 @@ def convert(source, from_format="markdown", to_format="html5", title=None, stand
         else:
             cmd.extend(["--metadata", "title={}".format(title)])
 
-    # PDF needs explicit engine since no pdflatex.
+    # PDF needs explicit engine since no pdflatex. Tighten margins —
+    # wkhtmltopdf defaults to ~25mm top which leaves a half-page of empty
+    # space above content. 12mm/15mm is enough to look printed without
+    # wasting paper.
     if to_format == "pdf":
-        cmd.extend(["--pdf-engine=wkhtmltopdf"])
+        cmd.extend([
+            "--pdf-engine=wkhtmltopdf",
+            "-V", "margin-top=12mm",
+            "-V", "margin-bottom=12mm",
+            "-V", "margin-left=15mm",
+            "-V", "margin-right=15mm",
+        ])
 
     if is_binary:
         # Binary formats need file output.
diff --git a/remarkbox/lib/provenance.py b/remarkbox/lib/provenance.py
index 952328f..aa9e1e6 100644
--- a/remarkbox/lib/provenance.py
+++ b/remarkbox/lib/provenance.py
@@ -120,8 +120,8 @@ def header_md(canonical_uri, snapshot_iso=None, version="dev",
         '<td style="border: 0; vertical-align: top; padding: 0 24px 0 0;">\n\n'
         '{text}\n\n'
         '</td>\n'
-        '<td style="border: 0; vertical-align: top; width: 160px; text-align: right;">\n\n'
-        '![Scan to visit the living source]({qr})\n\n'
+        '<td style="border: 0; vertical-align: top; width: 200px; text-align: right;">\n\n'
+        '![Scan for living source]({qr})\n\n'
         '</td>\n'
         '</tr>\n'
         '</table>\n'