diff --git a/packages/altair-app/src/app/modules/altair/components/x-input/x-input.component.ts b/packages/altair-app/src/app/modules/altair/components/x-input/x-input.component.ts
index 218731e686..e68a1a8e97 100644
--- a/packages/altair-app/src/app/modules/altair/components/x-input/x-input.component.ts
+++ b/packages/altair-app/src/app/modules/altair/components/x-input/x-input.component.ts
@@ -15,7 +15,13 @@ import {
   CompletionContext,
   completionKeymap,
 } from '@codemirror/autocomplete';
-import { EditorState, Extension, StateEffect, StateField } from '@codemirror/state';
+import {
+  ChangeSpec,
+  EditorState,
+  Extension,
+  StateEffect,
+  StateField,
+} from '@codemirror/state';
 import {
   Decoration,
   DecorationSet,
@@ -126,7 +132,22 @@ export class XInputComponent implements AfterViewInit, ControlValueAccessor {
         },
       },
     });
+
     const filterNewLine = EditorState.transactionFilter.of((tr) => {
+      if (tr.changes.empty) return tr;
+
+      if (tr.isUserEvent('input.paste')) {
+        // For paste events, replace newlines with spaces
+        const changes = [
+          {
+            from: 0,
+            insert: tr.newDoc.toString().replace(/\n/g, ' '),
+          },
+        ];
+        return [{ changes }];
+      }
+
+      // Block multi-line input from other sources
       return tr.newDoc.lines > 1 ? [] : [tr];
     });