diff --git a/booklore-api/src/main/java/com/adityachandel/booklore/util/MetadataChangeDetector.java b/booklore-api/src/main/java/com/adityachandel/booklore/util/MetadataChangeDetector.java
index 3a557b4a9..f31f6bd4e 100644
--- a/booklore-api/src/main/java/com/adityachandel/booklore/util/MetadataChangeDetector.java
+++ b/booklore-api/src/main/java/com/adityachandel/booklore/util/MetadataChangeDetector.java
@@ -3,6 +3,7 @@ package com.adityachandel.booklore.util;
 import com.adityachandel.booklore.model.MetadataClearFlags;
 import com.adityachandel.booklore.model.dto.BookMetadata;
 import com.adityachandel.booklore.model.entity.BookMetadataEntity;
+import lombok.extern.slf4j.Slf4j;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -10,10 +11,9 @@ import java.util.*;
 import java.util.function.Supplier;
 import java.util.stream.Collectors;
 
+@Slf4j
 public class MetadataChangeDetector {
 
-    private static final Logger log = LoggerFactory.getLogger(MetadataChangeDetector.class);
-
     public static boolean isDifferent(BookMetadata newMeta, BookMetadataEntity existingMeta, MetadataClearFlags clear) {
         if (clear == null) return true;
 
@@ -46,6 +46,12 @@ public class MetadataChangeDetector {
         compare(changes, "authors", clear.isAuthors(), newMeta.getAuthors(), toNameSet(existingMeta.getAuthors()), () -> !isTrue(existingMeta.getAuthorsLocked()), newMeta.getAuthorsLocked(), existingMeta.getAuthorsLocked());
         compare(changes, "categories", clear.isCategories(), newMeta.getCategories(), toNameSet(existingMeta.getCategories()), () -> !isTrue(existingMeta.getCategoriesLocked()), newMeta.getCategoriesLocked(), existingMeta.getCategoriesLocked());
 
+        Boolean coverLockedNew = newMeta.getCoverLocked();
+        Boolean coverLockedExisting = existingMeta.getCoverLocked();
+        if (differsLock(coverLockedNew, coverLockedExisting)) {
+            changes.add("cover lock: [" + isTrue(coverLockedExisting) + "] → [" + isTrue(coverLockedNew) + "]");
+        }
+
         if (!changes.isEmpty()) {
             /*changes.forEach(change -> log.info("Metadata change: {}", change));*/
             return true;
diff --git a/booklore-ui/src/app/metadata/book-metadata-center-component/metadata-editor/metadata-editor.component.ts b/booklore-ui/src/app/metadata/book-metadata-center-component/metadata-editor/metadata-editor.component.ts
index 32f71d899..062120f43 100644
--- a/booklore-ui/src/app/metadata/book-metadata-center-component/metadata-editor/metadata-editor.component.ts
+++ b/booklore-ui/src/app/metadata/book-metadata-center-component/metadata-editor/metadata-editor.component.ts
@@ -134,7 +134,7 @@ export class MetadataEditorComponent implements OnInit {
       seriesNameLocked: new FormControl(false),
       seriesNumberLocked: new FormControl(false),
       seriesTotalLocked: new FormControl(false),
-      thumbnailUrlLocked: new FormControl(false),
+      coverLocked: new FormControl(false),
     });
   }
 
@@ -227,7 +227,7 @@ export class MetadataEditorComponent implements OnInit {
       seriesNameLocked: metadata.seriesNameLocked ?? false,
       seriesNumberLocked: metadata.seriesNumberLocked ?? false,
       seriesTotalLocked: metadata.seriesTotalLocked ?? false,
-      thumbnailUrlLocked: metadata.coverLocked ?? false,
+      coverLocked: metadata.coverLocked ?? false,
     });
 
     const lockableFields: { key: keyof BookMetadata; control: string }[] = [
@@ -256,7 +256,8 @@ export class MetadataEditorComponent implements OnInit {
       {key: 'descriptionLocked', control: 'description'},
       {key: 'seriesNameLocked', control: 'seriesName'},
       {key: 'seriesNumberLocked', control: 'seriesNumber'},
-      {key: 'seriesTotalLocked', control: 'seriesTotal'}
+      {key: 'seriesTotalLocked', control: 'seriesTotal'},
+      {key: 'coverLocked', control: 'thumbnailUrl'},
     ];
 
     for (const {key, control} of lockableFields) {
@@ -287,6 +288,9 @@ export class MetadataEditorComponent implements OnInit {
   }
 
   toggleLock(field: string): void {
+    if (field === 'thumbnailUrl') {
+      field = 'cover'
+    }
     const isLocked = this.metadataForm.get(field + 'Locked')?.value;
     const updatedLockedState = !isLocked;
     this.metadataForm.get(field + 'Locked')?.setValue(updatedLockedState);
@@ -396,7 +400,7 @@ export class MetadataEditorComponent implements OnInit {
       seriesNameLocked: form.get('seriesNameLocked')?.value,
       seriesNumberLocked: form.get('seriesNumberLocked')?.value,
       seriesTotalLocked: form.get('seriesTotalLocked')?.value,
-      coverLocked: form.get('thumbnailUrlLocked')?.value,
+      coverLocked: form.get('coverLocked')?.value,
 
       ...(shouldLockAllFields !== undefined && {allFieldsLocked: shouldLockAllFields})
     };
diff --git a/booklore-ui/src/app/metadata/book-metadata-center-component/metadata-picker/metadata-picker.component.ts b/booklore-ui/src/app/metadata/book-metadata-center-component/metadata-picker/metadata-picker.component.ts
index 82743ccd3..c96b33a1f 100644
--- a/booklore-ui/src/app/metadata/book-metadata-center-component/metadata-picker/metadata-picker.component.ts
+++ b/booklore-ui/src/app/metadata/book-metadata-center-component/metadata-picker/metadata-picker.component.ts
@@ -144,7 +144,7 @@ export class MetadataPickerComponent implements OnInit {
       seriesNameLocked: new FormControl(false),
       seriesNumberLocked: new FormControl(false),
       seriesTotalLocked: new FormControl(false),
-      thumbnailUrlLocked: new FormControl(false),
+      coverLocked: new FormControl(false),
     });
   }
 
@@ -221,7 +221,7 @@ export class MetadataPickerComponent implements OnInit {
           seriesNameLocked: metadata.seriesNameLocked || false,
           seriesNumberLocked: metadata.seriesNumberLocked || false,
           seriesTotalLocked: metadata.seriesTotalLocked || false,
-          thumbnailUrlLocked: metadata.coverLocked || false,
+          coverLocked: metadata.coverLocked || false,
         });
 
         if (metadata.titleLocked) this.metadataForm.get('title')?.disable();
@@ -330,7 +330,7 @@ export class MetadataPickerComponent implements OnInit {
       seriesNameLocked: this.metadataForm.get('seriesNameLocked')?.value,
       seriesNumberLocked: this.metadataForm.get('seriesNumberLocked')?.value,
       seriesTotalLocked: this.metadataForm.get('seriesTotalLocked')?.value,
-      coverLocked: this.metadataForm.get('thumbnailUrlLocked')?.value,
+      coverLocked: this.metadataForm.get('coverLocked')?.value,
 
       ...(shouldLockAllFields !== undefined && {allFieldsLocked: shouldLockAllFields}),
     };
@@ -407,6 +407,9 @@ export class MetadataPickerComponent implements OnInit {
   }
 
   toggleLock(field: string): void {
+    if (field === 'thumbnailUrl') {
+      field = 'cover'
+    }
     const isLocked = this.metadataForm.get(field + 'Locked')?.value;
     const updatedLockedState = !isLocked;
     this.metadataForm.get(field + 'Locked')?.setValue(updatedLockedState);
@@ -437,6 +440,9 @@ export class MetadataPickerComponent implements OnInit {
   }
 
   copyFetchedToCurrent(field: string): void {
+    if (field === 'thumbnailUrl') {
+      field = 'cover';
+    }
     const isLocked = this.metadataForm.get(`${field}Locked`)?.value;
     if (isLocked) {
       this.messageService.add({
@@ -446,6 +452,9 @@ export class MetadataPickerComponent implements OnInit {
       });
       return;
     }
+    if (field === 'cover') {
+      field = 'thumbnailUrl';
+    }
     const value = this.fetchedMetadata[field];
     if (value) {
       this.metadataForm.get(field)?.setValue(value);