diff --git a/i18n/english.yml b/i18n/english.yml
index 8f98908e0..790a1cedc 100644
--- a/i18n/english.yml
+++ b/i18n/english.yml
@@ -97,6 +97,7 @@ components:
   CustomCSVForm:
     numLines: "%numLines% lines."
     csvInvalid: CSV invalid!
+    uploading: Uploading...
   DatatoolsNavbar:
     account: My Account
     alerts: Alerts
diff --git a/i18n/german.yml b/i18n/german.yml
index f6ab19b6f..a439596f6 100644
--- a/i18n/german.yml
+++ b/i18n/german.yml
@@ -1495,6 +1495,7 @@ components:
   CustomCSVForm:
     numLines: "%numLines% lines."
     csvInvalid: CSV ungültig!
+    uploading: Uploading...
   FeedTransformationErrors:
     csvMissingName: Custom CSV must have a name.
     csvNameContainsTxt: Custom CSV name cannot contain .txt
diff --git a/i18n/polish.yml b/i18n/polish.yml
index f9af6410d..fd7531c85 100644
--- a/i18n/polish.yml
+++ b/i18n/polish.yml
@@ -96,6 +96,7 @@ components:
   CustomCSVForm:
     numLines: "%numLines% lines."
     csvInvalid: CSV ungültig! 
+    uploading: Uploading...
   DatatoolsNavbar:
     account: Moje konto
     alerts: Alerty
diff --git a/lib/manager/components/transform/CustomCSVForm.js b/lib/manager/components/transform/CustomCSVForm.js
index b815d912e..0103da367 100644
--- a/lib/manager/components/transform/CustomCSVForm.js
+++ b/lib/manager/components/transform/CustomCSVForm.js
@@ -56,7 +56,7 @@ const CustomCSVForm = (props: Props) => {
         }}
       >
         {headerText}
-        <textarea
+        {numLines < 600000 && <textarea
           id='csvData'
           name={name}
           onChange={onChangeCsvData}
@@ -71,7 +71,7 @@ const CustomCSVForm = (props: Props) => {
             whiteSpace: 'pre',
             width: '400px'
           }}
-          value={csvData} />
+          value={csvData} />}
       </label>
       <div style={{marginBottom: '10px'}}>
         <input
@@ -79,6 +79,7 @@ const CustomCSVForm = (props: Props) => {
           name='file'
           onChange={(e) => {
             if (e.target && e.target.files.length > 0) {
+              onChangeCsvData({target: {name, value: messages('uploading')}})
               const reader = new FileReader()
               reader.onload = fileContents => {
                 onChangeCsvData({target: {name, value: fileContents.target.result}})