diff --git a/src/vs/workbench/browser/dnd.ts b/src/vs/workbench/browser/dnd.ts
index 52afb8083d8..03550d2d646 100644
--- a/src/vs/workbench/browser/dnd.ts
+++ b/src/vs/workbench/browser/dnd.ts
@@ -294,8 +294,8 @@ export function fillEditorsDragData(accessor: ServicesAccessor, resourcesOrEdito
 						editor.encoding = textFileModel.getEncoding();
 					}
 
-					// contents (only if dirty)
-					if (typeof editor.contents !== 'string' && textFileModel.isDirty()) {
+					// contents (only if dirty and not too large)
+					if (typeof editor.contents !== 'string' && textFileModel.isDirty() && !textFileModel.textEditorModel.isTooLargeForHeapOperation()) {
 						editor.contents = textFileModel.textEditorModel.getValue();
 					}
 				}
diff --git a/src/vs/workbench/contrib/files/browser/editors/fileEditorInput.ts b/src/vs/workbench/contrib/files/browser/editors/fileEditorInput.ts
index faf84eafbf9..d6c151043f0 100644
--- a/src/vs/workbench/contrib/files/browser/editors/fileEditorInput.ts
+++ b/src/vs/workbench/contrib/files/browser/editors/fileEditorInput.ts
@@ -433,8 +433,8 @@ export class FileEditorInput extends AbstractTextResourceEditorInput implements
 			untypedInput.languageId = this.getLanguageId();
 			untypedInput.contents = (() => {
 				const model = this.textFileService.files.get(this.resource);
-				if (model?.isDirty()) {
-					return model.textEditorModel.getValue(); // only if dirty
+				if (model?.isDirty() && !model.textEditorModel.isTooLargeForHeapOperation()) {
+					return model.textEditorModel.getValue(); // only if dirty and not too large
 				}
 
 				return undefined;