diff --git a/bin/send_dir.sh b/bin/send_dir.sh
new file mode 100755
index 0000000..13d53dd
--- /dev/null
+++ b/bin/send_dir.sh
@@ -0,0 +1,90 @@
+#!/usr/bin/env bash
+#
+# send_dir.sh — upload every file in a directory to a running FileServer.
+#
+# Each file is POSTed to /upload as multipart/form-data. By default one file per
+# request (so you get per-file feedback); use -b to batch all files into a
+# single request instead.
+#
+# Usage:
+#   bin/send_dir.sh [-u URL] [-b] [-r] DIR
+#
+#   DIR         directory whose files are uploaded
+#   -u URL      server base URL (default: http://127.0.0.1:8080, or $FS_URL)
+#   -b          batch: send all files in one multipart request
+#   -r          recurse into subdirectories
+#
+# Examples:
+#   bin/send_dir.sh data/samples
+#   bin/send_dir.sh -u http://host:9000 -b -r ~/Downloads
+set -euo pipefail
+
+url="${FS_URL:-http://127.0.0.1:8080}"
+batch=0
+recurse=0
+
+while getopts ":u:brh" opt; do
+  case "$opt" in
+    u) url="$OPTARG" ;;
+    b) batch=1 ;;
+    r) recurse=1 ;;
+    h) sed -n '2,20p' "$0"; exit 0 ;;
+    \?) echo "unknown option: -$OPTARG" >&2; exit 2 ;;
+    :) echo "option -$OPTARG needs an argument" >&2; exit 2 ;;
+  esac
+done
+shift $((OPTIND - 1))
+
+dir="${1:-}"
+if [[ -z "$dir" ]]; then
+  echo "usage: $0 [-u URL] [-b] [-r] DIR" >&2
+  exit 2
+fi
+if [[ ! -d "$dir" ]]; then
+  echo "not a directory: $dir" >&2
+  exit 2
+fi
+
+endpoint="${url%/}/upload"
+
+# Collect regular files (optionally recursive), NUL-safe for odd filenames.
+mapfile -d '' files < <(
+  if [[ "$recurse" -eq 1 ]]; then
+    find "$dir" -type f -print0
+  else
+    find "$dir" -maxdepth 1 -type f -print0
+  fi
+)
+
+if [[ "${#files[@]}" -eq 0 ]]; then
+  echo "no files found in $dir" >&2
+  exit 1
+fi
+
+echo "uploading ${#files[@]} file(s) from '$dir' to $endpoint"
+
+if [[ "$batch" -eq 1 ]]; then
+  # One request with every file. Each -F field name is arbitrary; the server
+  # keys off the filename, so we just number them.
+  args=()
+  i=0
+  for f in "${files[@]}"; do
+    args+=(-F "f${i}=@${f}")
+    i=$((i + 1))
+  done
+  code=$(curl -sS -o /dev/stderr -w '%{http_code}' "${args[@]}" "$endpoint")
+  echo
+  echo "-> HTTP $code"
+  [[ "$code" == "202" ]]
+else
+  # One request per file.
+  ok=0
+  fail=0
+  for f in "${files[@]}"; do
+    code=$(curl -sS -o /dev/stderr -w '%{http_code}' -F "file=@${f}" "$endpoint")
+    echo "  -> HTTP $code  ${f}"
+    if [[ "$code" == "202" ]]; then ok=$((ok + 1)); else fail=$((fail + 1)); fi
+  done
+  echo "done: $ok accepted, $fail failed"
+  [[ "$fail" -eq 0 ]]
+fi