diff --git a/README.md b/README.md
index 695ff4c..fafaecd 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,17 @@ Make sure you have `curl` and `jq` installed. If you want to enter text in
 markdown format, install `python-markdown2` (`pip install markdown2` or your
 distro's `python3-markdown2` package).
 
-Create a config file `~/.config/wordpress-rest-curl/config.sh` from the `config.sh.template` file.
+Copy `config.sh.template` to `~/.config/wordpress-rest-curl/config.sh` and
+fill in whatever's shared across sites (`TRANSFORM`, `EDITOR`, `STATUS`, ...).
+`config.sh` is always loaded first if it exists — it doesn't need `USER`,
+`PASSWORD`, or `SERVER` filled in.
+
+If you post to more than one WordPress instance, copy `site.sh.template` to
+`~/.config/wordpress-rest-curl/NAME.sh` once per site, e.g.
+`blog-example-com.sh` and `news-example-com.sh`, containing just the per-instance bits
+(`USER`, `PASSWORD`, `SERVER`, and any `CATEGORIES`/`TAGS` that differ). Pick
+one at run time with `--site NAME` (see Options below) — its values are
+layered on top of `config.sh`, overriding only what it sets.
 
 Copy the posting script to e.g. `/usr/local/bin/wordpress-post` so that you can run it from anywhere.
 
@@ -25,6 +35,7 @@ Copy the posting script to e.g. `/usr/local/bin/wordpress-post` so that you can
 * Done!
 
 ### Options
+* `--site NAME` — use `~/.config/wordpress-rest-curl/NAME.sh` instead of the default `config.sh`. Useful when posting to multiple WordPress instances with different credentials.
 * `--file PATH` — use PATH as the post content instead of opening `$EDITOR`.
 * `--publish` — shortcut for `STATUS=publish`, posts live immediately.
 * `--edit POST_ID` — update an existing post instead of creating a new one.
diff --git a/config.sh.template b/config.sh.template
index 1909f3f..d0e5e54 100755
--- a/config.sh.template
+++ b/config.sh.template
@@ -1,4 +1,8 @@
 #!/bin/bash
+# Shared defaults, loaded before any --site NAME file. If you only ever post
+# to one WordPress instance, fill in USER/PASSWORD/SERVER here too and skip
+# --site entirely. If you post to more than one, leave those three blank
+# here and put them in per-site files instead (see README).
 EDITOR=vim
 TRANSFORM=('title' 'markdown') # empty or a subset of: 'title' 'markdown'
 USER="" # WP user to create the post
diff --git a/post.sh b/post.sh
index e7009b8..b6b7744 100755
--- a/post.sh
+++ b/post.sh
@@ -11,21 +11,28 @@ STATUS="draft" # one of publish,future,draft,pending,private
 CATEGORIES="" # comma separated integer IDs of categories
 TAGS="" # comma separated integer IDs of tags
 TMPFILE=/tmp/wordpress-post.txt # location of a temporary file with the post text
+CONFIG_DIR="${WORDPRESS_REST_CURL_CONFIG_DIR:-$HOME/.config/wordpress-rest-curl}"
 
-source ~/.config/wordpress-rest-curl/config.sh
-
-# CLI options (override config):
+# CLI options:
+#   --site NAME      after config.sh, also source $CONFIG_DIR/NAME.sh, whose
+#                     values override config.sh's (lets you keep just the
+#                     per-instance bits — USER/PASSWORD/SERVER — in each site
+#                     file, and shared defaults in config.sh)
 #   --edit POST_ID   update an existing post instead of creating a new one
 #   --publish        shortcut for STATUS=publish
 #   --file PATH      use PATH as the post source instead of opening $EDITOR
+SITE=""
 POST_ID=""
 SOURCE_FILE=""
+PUBLISH=0
 while [[ $# -gt 0 ]]; do
     case "$1" in
+        --site)
+            SITE="$2"; shift 2 ;;
         --edit)
             POST_ID="$2"; shift 2 ;;
         --publish)
-            STATUS="publish"; shift ;;
+            PUBLISH=1; shift ;;
         --file)
             SOURCE_FILE="$2"; shift 2 ;;
         *)
@@ -34,6 +41,20 @@ while [[ $# -gt 0 ]]; do
     esac
 done
 
+DEFAULT_CONFIG_FILE="$CONFIG_DIR/config.sh"
+[[ -e "$DEFAULT_CONFIG_FILE" ]] && source "$DEFAULT_CONFIG_FILE"
+
+if [[ -n "$SITE" ]]; then
+    SITE_CONFIG_FILE="$CONFIG_DIR/$SITE.sh"
+    [[ -e "$SITE_CONFIG_FILE" ]] || { echo "Config file not found: $SITE_CONFIG_FILE" >&2; exit 1; }
+    source "$SITE_CONFIG_FILE"
+elif [[ ! -e "$DEFAULT_CONFIG_FILE" ]]; then
+    echo "No site specified and no default config found. Pass --site NAME or create $DEFAULT_CONFIG_FILE" >&2
+    exit 1
+fi
+
+[[ "$PUBLISH" -eq 1 ]] && STATUS="publish"
+
 # let the user provide the post content
 if [[ -n "$SOURCE_FILE" ]]; then
     cp "$SOURCE_FILE" "$TMPFILE" || exit 1
diff --git a/site.sh.template b/site.sh.template
new file mode 100644
index 0000000..6bd11f8
--- /dev/null
+++ b/site.sh.template
@@ -0,0 +1,9 @@
+#!/bin/bash
+# Per-site overrides, loaded after config.sh when running with --site NAME.
+# Copy to ~/.config/wordpress-rest-curl/NAME.sh and fill in. Only set what
+# differs from config.sh -- anything left out here falls back to config.sh.
+USER="" # WP user to create the post
+PASSWORD="" # application password generated for your WP user
+SERVER="" # server hostname, optionally with subdirectories
+CATEGORIES="" # comma separated integer IDs of categories
+TAGS="" # comma separated integer IDs of tags
diff --git a/tests/run_tests.sh b/tests/run_tests.sh
index 152aa52..824b52e 100755
--- a/tests/run_tests.sh
+++ b/tests/run_tests.sh
@@ -34,6 +34,13 @@ SERVER="http://127.0.0.1:$PORT"
 CATEGORIES="3,7"
 TAGS="10"
 EOF
+# Deliberately sparse: only the fields that differ from config.sh, to prove
+# --site layers on top of the default config rather than replacing it.
+cat > "$HOME/.config/wordpress-rest-curl/othersite.sh" <<EOF
+USER="other-tester"
+PASSWORD="other-pass"
+CATEGORIES="1"
+EOF
 
 POST_FILE="$WORKDIR/post.md"
 cat > "$POST_FILE" <<'EOF2'
@@ -77,6 +84,27 @@ REQ=$(cat "$MOCK_WP_REQUEST_FILE")
 assert_eq "edit: path includes post ID" "/wp-json/wp/v2/posts/99" "$(jq -r '.path' <<<"$REQ")"
 assert_eq "edit: status defaults to draft" "draft" "$(jq -r '.payload.status' <<<"$REQ")"
 
+# --- --site layers on top of config.sh: overrides what it sets, inherits the rest ---
+rm -f "$MOCK_WP_REQUEST_FILE" "$MOCK_WP_CONTROL_FILE"
+run_post_sh --site othersite --file "$POST_FILE" >/dev/null
+assert_eq "site: exit code" "0" "$?"
+REQ=$(cat "$MOCK_WP_REQUEST_FILE")
+assert_eq "site: categories overridden by site config" "[1]" "$(jq -c '.payload.categories' <<<"$REQ")"
+assert_eq "site: tags inherited from default config" "[10]" "$(jq -c '.payload.tags' <<<"$REQ")"
+assert_eq "site: title transform inherited from default config" "My Test Title" "$(jq -r '.payload.title' <<<"$REQ")"
+
+rm -f "$MOCK_WP_REQUEST_FILE" "$MOCK_WP_CONTROL_FILE"
+OUT=$(run_post_sh --site does-not-exist --file "$POST_FILE" 2>&1)
+assert_eq "site: unknown site exits non-zero" "1" "$?"
+assert_eq "site: unknown site error message" "true" "$(grep -q "Config file not found" <<<"$OUT" && echo true || echo false)"
+
+# --- no --site and no default config.sh: clean error, not a crash ---
+mv "$HOME/.config/wordpress-rest-curl/config.sh" "$WORKDIR/config.sh.bak"
+OUT=$(run_post_sh --file "$POST_FILE" 2>&1)
+assert_eq "no config: exits non-zero" "1" "$?"
+assert_eq "no config: error message" "true" "$(grep -q "No site specified and no default config found" <<<"$OUT" && echo true || echo false)"
+mv "$WORKDIR/config.sh.bak" "$HOME/.config/wordpress-rest-curl/config.sh"
+
 # --- non-2xx response is surfaced and script exits non-zero ---
 rm -f "$MOCK_WP_REQUEST_FILE"
 echo '{"status": 401, "body": {"code": "rest_forbidden", "message": "Sorry, you are not allowed to do that."}}' > "$MOCK_WP_CONTROL_FILE"