diff --git a/addons/website_slides/controllers/main.py b/addons/website_slides/controllers/main.py
index e183045e062..fbebb1613be 100644
--- a/addons/website_slides/controllers/main.py
+++ b/addons/website_slides/controllers/main.py
@@ -883,7 +883,7 @@ class WebsiteSlides(WebsiteProfile):
             return preview
         values = Slide._parse_document_url(data['url'], only_preview_fields=True)
         if values.get('error'):
-            preview['error'] = _('Could not fetch data from url. Document or access right not available.\nHere is the received response: %s') % values['error']
+            preview['error'] = values['error']
             return preview
         return values
 
diff --git a/addons/website_slides/models/slide_slide.py b/addons/website_slides/models/slide_slide.py
index 88f3c2405fb..e64a7ecf363 100644
--- a/addons/website_slides/models/slide_slide.py
+++ b/addons/website_slides/models/slide_slide.py
@@ -7,6 +7,7 @@ import io
 import re
 import requests
 import PyPDF2
+import json
 
 from dateutil.relativedelta import relativedelta
 from PIL import Image
@@ -337,7 +338,7 @@ class Slide(models.Model):
         if self.url:
             res = self._parse_document_url(self.url)
             if res.get('error'):
-                raise Warning(_('Could not fetch data from url. Document or access right not available:\n%s') % res['error'])
+                raise Warning(res.get('error'))
             values = res['values']
             if not values.get('document_id'):
                 raise Warning(_('Please enter valid Youtube or Google Doc URL'))
@@ -720,7 +721,7 @@ class Slide(models.Model):
         key = self.env['website'].get_current_website().website_slide_google_app_key
         fetch_res = self._fetch_data('https://www.googleapis.com/youtube/v3/videos', {'id': document_id, 'key': key, 'part': 'snippet,contentDetails', 'fields': 'items(id,snippet,contentDetails)'}, 'json')
         if fetch_res.get('error'):
-            return fetch_res
+            return {'error': self._extract_google_error_message(fetch_res.get('error'))}
 
         values = {'slide_type': 'video', 'document_id': document_id}
         items = fetch_res['values'].get('items')
@@ -754,6 +755,22 @@ class Slide(models.Model):
             })
         return {'values': values}
 
+    def _extract_google_error_message(self, error):
+        """
+        See here for Google error format
+        https://developers.google.com/drive/api/v3/handle-errors
+        """
+        try:
+            error = json.loads(error)
+            error = (error.get('error', {}).get('errors', []) or [{}])[0].get('reason')
+        except json.decoder.JSONDecodeError:
+            error = str(error)
+
+        if error == 'keyInvalid':
+            return _('Your Google API key is invalid, please update it into your settings.\nSettings > Website > Features > API Key')
+
+        return _('Could not fetch data from url. Document or access right not available:\n%s') % error
+
     @api.model
     def _parse_google_document(self, document_id, only_preview_fields):
         def get_slide_type(vals):
@@ -781,7 +798,7 @@ class Slide(models.Model):
 
         fetch_res = self._fetch_data('https://www.googleapis.com/drive/v2/files/%s' % document_id, params, "json")
         if fetch_res.get('error'):
-            return fetch_res
+            return {'error': self._extract_google_error_message(fetch_res.get('error'))}
 
         google_values = fetch_res['values']
         if only_preview_fields: