diff --git a/addons/product/i18n/product.pot b/addons/product/i18n/product.pot
index 4513e590355..fc75f8df117 100644
--- a/addons/product/i18n/product.pot
+++ b/addons/product/i18n/product.pot
@@ -2055,6 +2055,17 @@ msgstr ""
 msgid "Please enter a positive whole number."
 msgstr ""
 
+#. module: product
+#. odoo-python
+#: code:addons/product/models/product_document.py:0
+#, python-format
+msgid ""
+"Please enter a valid URL.\n"
+"Example: https://www.odoo.com\n"
+"\n"
+"Invalid URL: %s"
+msgstr ""
+
 #. module: product
 #. odoo-python
 #: code:addons/product/models/product_pricelist_item.py:0
diff --git a/addons/product/models/product_document.py b/addons/product/models/product_document.py
index 6b5cdc503d0..a0a0ad3b7ac 100644
--- a/addons/product/models/product_document.py
+++ b/addons/product/models/product_document.py
@@ -1,7 +1,8 @@
 
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
-from odoo import api, fields, models
+from odoo import _, api, fields, models
+from odoo.exceptions import ValidationError
 
 
 class ProductDocument(models.Model):
@@ -20,6 +21,16 @@ class ProductDocument(models.Model):
 
     active = fields.Boolean(default=True)
 
+    @api.onchange('url')
+    def _onchange_url(self):
+        for attachment in self:
+            if attachment.type == 'url' and attachment.url and\
+                not attachment.url.startswith(('https://', 'http://', 'ftp://')):
+                raise ValidationError(_(
+                    "Please enter a valid URL.\nExample: https://www.odoo.com\n\nInvalid URL: %s",
+                    attachment.url
+                ))
+
     #=== CRUD METHODS ===#
 
     @api.model_create_multi