diff --git a/docs/docs/sources/googledrive.md b/docs/docs/sources/googledrive.md
index 9883eb59..7875b43b 100644
--- a/docs/docs/sources/googledrive.md
+++ b/docs/docs/sources/googledrive.md
@@ -47,6 +47,7 @@ The spec takes the following fields:
     In reality, configure them based on your requirement: how fresh do you need the target index to be?
 
     :::
+*   `max_file_size` (`int`, optional): when set, any source file exceeding the limit (in bytes) will be ignored.
 
 ### Schema
 
diff --git a/python/cocoindex/sources/_engine_builtin_specs.py b/python/cocoindex/sources/_engine_builtin_specs.py
index 8a57d8c7..3f02bc5c 100644
--- a/python/cocoindex/sources/_engine_builtin_specs.py
+++ b/python/cocoindex/sources/_engine_builtin_specs.py
@@ -45,6 +45,7 @@ class GoogleDrive(op.SourceSpec):
     excluded_patterns: list[str] | None = None
 
     recent_changes_poll_interval: datetime.timedelta | None = None
+    max_file_size: int | None = None
 
 
 @dataclass
diff --git a/src/ops/sources/google_drive.rs b/src/ops/sources/google_drive.rs
index c8d49390..ecc68f96 100644
--- a/src/ops/sources/google_drive.rs
+++ b/src/ops/sources/google_drive.rs
@@ -60,6 +60,7 @@ pub struct Spec {
     binary: bool,
     root_folder_ids: Vec<String>,
     recent_changes_poll_interval: Option<std::time::Duration>,
+    max_file_size: Option<i64>,
     included_patterns: Option<Vec<String>>,
     excluded_patterns: Option<Vec<String>>,
 }
@@ -69,6 +70,7 @@ struct Executor {
     binary: bool,
     root_folder_ids: IndexSet<Arc<str>>,
     recent_updates_poll_interval: Option<std::time::Duration>,
+    max_file_size: Option<i64>,
     pattern_matcher: PatternMatcher,
 }
 
@@ -96,6 +98,7 @@ impl Executor {
             binary: spec.binary,
             root_folder_ids: spec.root_folder_ids.into_iter().map(Arc::from).collect(),
             recent_updates_poll_interval: spec.recent_changes_poll_interval,
+            max_file_size: spec.max_file_size,
             pattern_matcher: PatternMatcher::new(spec.included_patterns, spec.excluded_patterns)?,
         })
     }
@@ -303,7 +306,7 @@ impl SourceExecutor for Executor {
         let mut seen_ids = HashSet::new();
         let mut folder_ids = self.root_folder_ids.clone();
         let fields = format!(
-            "files(id,name,mimeType,trashed{})",
+            "files(id,name,mimeType,trashed,size{})",
             optional_modified_time(options.include_ordinal)
         );
         let mut new_folder_ids = Vec::new();
@@ -319,6 +322,12 @@ impl SourceExecutor for Executor {
                         if !file.name.as_deref().is_some_and(|name| self.pattern_matcher.is_file_included(name)){
                             continue
                         }
+                        if let Some(max_size) = self.max_file_size
+                            && let Some(file_size) = file.size
+                            && file_size > max_size {
+                                    // Skip files over the specified limit
+                                    continue;
+                                }
                         curr_rows.extend(self.visit_file(file, &mut new_folder_ids, &mut seen_ids)?);
                     }
                     if !curr_rows.is_empty() {
@@ -342,7 +351,7 @@ impl SourceExecutor for Executor {
     ) -> Result<PartialSourceRowData> {
         let file_id = key.single_part()?.str_value()?;
         let fields = format!(
-            "id,name,mimeType,trashed{}",
+            "id,name,mimeType,trashed,size{}",
             optional_modified_time(options.include_ordinal)
         );
         let resp = self
@@ -375,6 +384,10 @@ impl SourceExecutor for Executor {
                 content_version_fp: None,
             });
         }
+        // Check file size limit
+        if let Some(max_size) = self.max_file_size
+            && let Some(file_size) = file.size
+            && file_size > max_size
         let ordinal = if options.include_ordinal {
             file.modified_time.map(|t| t.try_into()).transpose()?
         } else {