diff --git a/.gitignore b/.gitignore
index 0e3855c..2663397 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,5 @@ __pycache__/
 .bitnet_cache/
 
 .offline_bundle/
+
+.online_assets/
diff --git a/ONLINE_RESOURCE_COLLECTION.md b/ONLINE_RESOURCE_COLLECTION.md
new file mode 100644
index 0000000..a8fefe8
--- /dev/null
+++ b/ONLINE_RESOURCE_COLLECTION.md
@@ -0,0 +1,19 @@
+# Online tool/reference collection
+
+인터넷이 열려 있는 턴에서 필요한 툴 패키지(wheel)와 UI/접근성 레퍼런스를 로컬로 저장하기 위한 작업 기록 문서.
+
+## Source catalog
+- `resources/online_sources.json`
+  - `tool_packages`: 다운로드 대상 pip 패키지 목록
+  - `reference_urls`: 저장 대상 웹 레퍼런스 URL 목록
+
+## Collector
+- `scripts/collect_online_assets.py`
+  - pip wheel 다운로드 시도 (`.online_assets/wheels`)
+  - 레퍼런스 HTML 다운로드 시도 (`.online_assets/references`)
+  - 결과 리포트 생성 (`.online_assets/meta/collection_report.json`)
+
+## Run
+```bash
+python scripts/collect_online_assets.py
+```
diff --git a/resources/online_sources.json b/resources/online_sources.json
new file mode 100644
index 0000000..c9d1494
--- /dev/null
+++ b/resources/online_sources.json
@@ -0,0 +1,16 @@
+{
+  "tool_packages": [
+    "matplotlib",
+    "pandas",
+    "jupyterlab",
+    "pytest",
+    "playwright"
+  ],
+  "reference_urls": [
+    "https://www.w3.org/WAI/WCAG22/quickref/",
+    "https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA",
+    "https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API",
+    "https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl",
+    "https://web.dev/articles/loading-patterns"
+  ]
+}
diff --git a/scripts/collect_online_assets.py b/scripts/collect_online_assets.py
new file mode 100755
index 0000000..37e30a3
--- /dev/null
+++ b/scripts/collect_online_assets.py
@@ -0,0 +1,106 @@
+from __future__ import annotations
+
+import json
+import re
+import subprocess
+import sys
+from dataclasses import dataclass, asdict
+from datetime import datetime, timezone
+from pathlib import Path
+from urllib.error import HTTPError, URLError
+from urllib.parse import urlparse
+from urllib.request import Request, urlopen
+
+ROOT = Path(__file__).resolve().parent.parent
+SOURCES_FILE = ROOT / "resources" / "online_sources.json"
+OUT_DIR = ROOT / ".online_assets"
+REF_DIR = OUT_DIR / "references"
+WHEEL_DIR = OUT_DIR / "wheels"
+META_DIR = OUT_DIR / "meta"
+
+
+@dataclass
+class DownloadResult:
+    target: str
+    category: str
+    ok: bool
+    path: str | None
+    detail: str
+
+
+def _slug_from_url(url: str) -> str:
+    parsed = urlparse(url)
+    stem = (parsed.netloc + parsed.path).strip("/") or "index"
+    stem = re.sub(r"[^a-zA-Z0-9._-]+", "_", stem)
+    return f"{stem}.html"
+
+
+def _fetch_reference(url: str) -> DownloadResult:
+    REF_DIR.mkdir(parents=True, exist_ok=True)
+    out_path = REF_DIR / _slug_from_url(url)
+    req = Request(url, headers={"User-Agent": "bitnet-tools/online-collector"})
+    try:
+        with urlopen(req, timeout=20) as resp:
+            body = resp.read()
+        out_path.write_bytes(body)
+        return DownloadResult(url, "reference", True, str(out_path.relative_to(ROOT)), "downloaded")
+    except HTTPError as exc:
+        return DownloadResult(url, "reference", False, None, f"http_error:{exc.code}")
+    except URLError as exc:
+        return DownloadResult(url, "reference", False, None, f"url_error:{exc.reason}")
+    except Exception as exc:  # pragma: no cover
+        return DownloadResult(url, "reference", False, None, f"error:{exc}")
+
+
+def _download_wheel(pkg: str) -> DownloadResult:
+    WHEEL_DIR.mkdir(parents=True, exist_ok=True)
+    cmd = [sys.executable, "-m", "pip", "download", pkg, "-d", str(WHEEL_DIR)]
+    proc = subprocess.run(cmd, capture_output=True, text=True, check=False)
+    if proc.returncode == 0:
+        return DownloadResult(pkg, "tool_package", True, str(WHEEL_DIR.relative_to(ROOT)), "downloaded")
+    detail = proc.stderr.strip() or proc.stdout.strip() or "pip download failed"
+    return DownloadResult(pkg, "tool_package", False, None, detail.splitlines()[-1][:220])
+
+
+def main() -> int:
+    if not SOURCES_FILE.exists():
+        print(f"sources file not found: {SOURCES_FILE}", file=sys.stderr)
+        return 1
+
+    data = json.loads(SOURCES_FILE.read_text(encoding="utf-8"))
+    tool_packages: list[str] = list(data.get("tool_packages", []))
+    reference_urls: list[str] = list(data.get("reference_urls", []))
+
+    OUT_DIR.mkdir(exist_ok=True)
+    META_DIR.mkdir(parents=True, exist_ok=True)
+
+    results: list[DownloadResult] = []
+
+    for pkg in tool_packages:
+        print(f"[tool] {pkg}")
+        results.append(_download_wheel(pkg))
+
+    for url in reference_urls:
+        print(f"[ref] {url}")
+        results.append(_fetch_reference(url))
+
+    report = {
+        "created_at": datetime.now(timezone.utc).isoformat(),
+        "python": sys.version,
+        "source_file": str(SOURCES_FILE.relative_to(ROOT)),
+        "results": [asdict(r) for r in results],
+        "summary": {
+            "total": len(results),
+            "success": sum(1 for r in results if r.ok),
+            "failed": sum(1 for r in results if not r.ok),
+        },
+    }
+
+    out = META_DIR / "collection_report.json"
+    out.write_text(json.dumps(report, ensure_ascii=False, indent=2), encoding="utf-8")
+    print(f"report saved: {out.relative_to(ROOT)}")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())