diff --git a/tests/tools/test_pixabay_per_page_clamp.py b/tests/tools/test_pixabay_per_page_clamp.py
new file mode 100644
index 00000000..a05a496e
--- /dev/null
+++ b/tests/tools/test_pixabay_per_page_clamp.py
@@ -0,0 +1,62 @@
+"""Pixabay rejects per_page outside 3-200 with HTTP 400, so every
+Pixabay caller must clamp before building the request."""
+
+import requests
+
+from tools.graphics.pixabay_image import PixabayImage
+from tools.video.pixabay_video import PixabayVideo
+from tools.video.stock_sources.base import SearchFilters
+from tools.video.stock_sources.pixabay_video import PixabayVideoSource
+
+
+class _FakeResponse:
+    def raise_for_status(self):
+        pass
+
+    def json(self):
+        return {"hits": [], "total": 0}
+
+
+def _capture_get(captured):
+    def fake_get(url, params=None, timeout=None, **kwargs):
+        captured["params"] = params
+        return _FakeResponse()
+
+    return fake_get
+
+
+def test_pixabay_video_tool_clamps_per_page(monkeypatch):
+    monkeypatch.setenv("PIXABAY_API_KEY", "test-key")
+    captured = {}
+    monkeypatch.setattr(requests, "get", _capture_get(captured))
+
+    PixabayVideo().execute({"query": "sky", "per_page": 1})
+    assert captured["params"]["per_page"] == 3
+
+    PixabayVideo().execute({"query": "sky", "per_page": 500})
+    assert captured["params"]["per_page"] == 200
+
+
+def test_pixabay_image_tool_clamps_per_page(monkeypatch):
+    monkeypatch.setenv("PIXABAY_API_KEY", "test-key")
+    captured = {}
+    monkeypatch.setattr(requests, "get", _capture_get(captured))
+
+    PixabayImage().execute({"query": "sky", "per_page": 1})
+    assert captured["params"]["per_page"] == 3
+
+    PixabayImage().execute({"query": "sky", "per_page": 500})
+    assert captured["params"]["per_page"] == 200
+
+
+def test_pixabay_stock_source_clamps_per_page(monkeypatch):
+    monkeypatch.setenv("PIXABAY_API_KEY", "test-key")
+    captured = {}
+    monkeypatch.setattr(requests, "get", _capture_get(captured))
+
+    source = PixabayVideoSource()
+    source.search("sky", SearchFilters(per_page=1))
+    assert captured["params"]["per_page"] == 3
+
+    source.search("sky", SearchFilters(per_page=500))
+    assert captured["params"]["per_page"] == 200
diff --git a/tools/graphics/pixabay_image.py b/tools/graphics/pixabay_image.py
index cba51aab..b2e2da98 100644
--- a/tools/graphics/pixabay_image.py
+++ b/tools/graphics/pixabay_image.py
@@ -127,7 +127,8 @@ class PixabayImage(BaseTool):
         params: dict[str, Any] = {
             "key": api_key,
             "q": query,
-            "per_page": inputs.get("per_page", 5),
+            # Pixabay rejects per_page outside 3-200 with HTTP 400
+            "per_page": max(3, min(inputs.get("per_page", 5), 200)),
             "page": inputs.get("page", 1),
             "safesearch": str(inputs.get("safesearch", True)).lower(),
         }
diff --git a/tools/video/pixabay_video.py b/tools/video/pixabay_video.py
index 75963374..a8a8da20 100644
--- a/tools/video/pixabay_video.py
+++ b/tools/video/pixabay_video.py
@@ -130,7 +130,8 @@ class PixabayVideo(BaseTool):
         params: dict[str, Any] = {
             "key": api_key,
             "q": query,
-            "per_page": inputs.get("per_page", 5),
+            # Pixabay rejects per_page outside 3-200 with HTTP 400
+            "per_page": max(3, min(inputs.get("per_page", 5), 200)),
             "page": inputs.get("page", 1),
             "safesearch": str(inputs.get("safesearch", True)).lower(),
         }