diff --git a/CLAUDE.md b/CLAUDE.md
index 0760507..38dab57 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -59,6 +59,8 @@ During development, run directly: `python3 mdcms.py <command>`
 | `mdcms build <name>` | Build `nav.yml` and `search.json` for a registered site. |
 | `mdcms build --path <path>` | Build using an explicit path — no registry needed. Intended for CI/CD. |
 | `mdcms build` | Build using current working directory. Simplest form for GitHub Actions. |
+| `mdcms fetch-deps [name]` | Download all external JS/CSS deps to `assets/required/vendors/` and Bunny Fonts to `assets/fonts/`. Patches `index.html` to use local paths — no CDN requests after this. |
+| `mdcms fetch-deps --path <path>` | Same, using an explicit path. |
 
 ## PWA config keys
 
diff --git a/mdcms.py b/mdcms.py
index 244f56d..af27b05 100644
--- a/mdcms.py
+++ b/mdcms.py
@@ -812,6 +812,39 @@ def build(name, path_override):
     click.echo(click.style("Build complete.", fg="green"))
 
 
+@cli.command("fetch-deps")
+@click.argument("name", required=False, default=None)
+@click.option("--path", "path_override", default=None, type=click.Path(),
+              help="Explicit site path (no registry lookup).")
+def fetch_deps(name, path_override):
+    """Download external JS/CSS dependencies and patch index.html for offline use."""
+    site_path = resolve_site_path(name, path_override)
+    if not (site_path / "index.html").exists():
+        raise click.ClickException(f"No index.html found at {site_path}")
+
+    click.echo(f"Fetching dependencies for {site_path} ...")
+
+    vendors_dir = site_path / "assets" / "required" / "vendors"
+    vendors_dir.mkdir(parents=True, exist_ok=True)
+
+    for cdn_url, rel_dest in CDN_DEPS:
+        dest = site_path / rel_dest
+        click.echo(f"  {rel_dest}")
+        try:
+            dest.write_bytes(_http_get(cdn_url))
+        except Exception as e:
+            raise click.ClickException(f"Failed to download {cdn_url}: {e}")
+
+    cfg = read_config(site_path)
+    local_font_css: list = []
+    if cfg.get("theme"):
+        local_font_css = _fetch_bunny_fonts(site_path, cfg["theme"])
+
+    _patch_index_html(site_path, local_font_css)
+
+    click.echo(click.style("Done. Site is ready for offline use.", fg="green"))
+
+
 # ─── Entry point ─────────────────────────────────────────────
 
 def main():