diff --git a/unshackle/core/downloaders/curl_impersonate.py b/unshackle/core/downloaders/curl_impersonate.py
index f9f0d95..52dab7a 100644
--- a/unshackle/core/downloaders/curl_impersonate.py
+++ b/unshackle/core/downloaders/curl_impersonate.py
@@ -76,6 +76,11 @@ def download(url: str, save_path: Path, session: Session, **kwargs: Any) -> Gene
 
                 try:
                     content_length = int(stream.headers.get("Content-Length", "0"))
+
+                    # Skip Content-Length validation for compressed responses since
+                    # curl_impersonate automatically decompresses but Content-Length shows compressed size
+                    if stream.headers.get("Content-Encoding", "").lower() in ["gzip", "deflate", "br"]:
+                        content_length = 0
                 except ValueError:
                     content_length = 0
 
diff --git a/unshackle/core/downloaders/requests.py b/unshackle/core/downloaders/requests.py
index ef57d77..49c1759 100644
--- a/unshackle/core/downloaders/requests.py
+++ b/unshackle/core/downloaders/requests.py
@@ -90,6 +90,11 @@ def download(
                 if not segmented:
                     try:
                         content_length = int(stream.headers.get("Content-Length", "0"))
+
+                        # Skip Content-Length validation for compressed responses since
+                        # requests automatically decompresses but Content-Length shows compressed size
+                        if stream.headers.get("Content-Encoding", "").lower() in ["gzip", "deflate", "br"]:
+                            content_length = 0
                     except ValueError:
                         content_length = 0