diff --git a/tools/site/make_site.sh b/tools/site/make_site.sh
index 67bbc95..c799d8e 100755
--- a/tools/site/make_site.sh
+++ b/tools/site/make_site.sh
@@ -52,3 +52,12 @@ DATA=build/site_data.json
 	|| { echo "couldn't dump the game data for the guide"; exit 1; }
 python3 tools/site/make_guide.py "$DATA" build/site || exit 1
 rm -f "$DATA"
+
+# Cloudflare Pages refuses any file over 25 MiB: catch it here, not at deploy.
+LIMIT=26214400
+for f in build/site/*; do
+	s=$(stat -f %z "$f" 2>/dev/null || stat -c %s "$f")
+	if [ "$s" -ge "$LIMIT" ]; then
+		echo "$f is $s bytes: over Cloudflare Pages' 25 MiB limit (re-encode the trailer smaller)"; exit 1
+	fi
+done
diff --git a/tools/trailer/make_trailer.sh b/tools/trailer/make_trailer.sh
index 4daed26..fe95ce5 100755
--- a/tools/trailer/make_trailer.sh
+++ b/tools/trailer/make_trailer.sh
@@ -32,7 +32,7 @@ ffmpeg -v error -y -i "$RAW" -f lavfi -i "aevalsrc='$PAD|$PAD_R':s=48000:d=$D" \
 	-filter_complex "[1:a]lowpass=f=1800,aecho=0.8:0.7:180|340:0.35|0.25,afade=t=in:d=2.5,afade=t=out:st=$OUT_AT:d=2.5[m];[0:a]volume=0.8[g];[g][m]amix=inputs=2:duration=first:normalize=0[a]" \
 	-map 0:v -map "[a]" -vf "scale=in_range=pc:out_range=tv,format=yuv420p" -color_range tv \
 	-colorspace bt709 -color_primaries bt709 -color_trc bt709 \
-	-c:v libx264 -profile:v high -level 4.0 -preset slow -crf 20 -tag:v avc1 \
+	-c:v libx264 -profile:v high -level 4.0 -preset slow -crf 23 -maxrate 3500k -bufsize 7000k -tag:v avc1 \
 	-c:a aac -b:a 160k -movflags +faststart "$OUT" || exit 1
 # The title, for the download page's poster.
 ffmpeg -v error -y -ss 4.5 -i "$OUT" -frames:v 1 -q:v 3 build/trailer/poster.jpg