diff --git a/src-ui/src/app/components/document-list/bulk-editor/bulk-editor.component.ts b/src-ui/src/app/components/document-list/bulk-editor/bulk-editor.component.ts
index 7ab3ec042..b44ece881 100644
--- a/src-ui/src/app/components/document-list/bulk-editor/bulk-editor.component.ts
+++ b/src-ui/src/app/components/document-list/bulk-editor/bulk-editor.component.ts
@@ -29,7 +29,9 @@ import { CorrespondentService } from 'src/app/services/rest/correspondent.servic
 import { CustomFieldsService } from 'src/app/services/rest/custom-fields.service'
 import { DocumentTypeService } from 'src/app/services/rest/document-type.service'
 import {
+  DocumentBulkEditMethod,
   DocumentService,
+  MergeDocumentsRequest,
   SelectionDataItem,
 } from 'src/app/services/rest/document.service'
 import { SavedViewService } from 'src/app/services/rest/saved-view.service'
@@ -257,7 +259,7 @@ export class BulkEditorComponent
 
   private executeBulkOperation(
     modal: NgbModalRef,
-    method: string,
+    method: DocumentBulkEditMethod,
     args: any,
     overrideDocumentIDs?: number[]
   ) {
@@ -869,15 +871,15 @@ export class BulkEditorComponent
     mergeDialog.confirmClicked
       .pipe(takeUntil(this.unsubscribeNotifier))
       .subscribe(() => {
-        const args = {}
+        const args: MergeDocumentsRequest = {}
         if (mergeDialog.metadataDocumentID > -1) {
-          args['metadata_document_id'] = mergeDialog.metadataDocumentID
+          args.metadata_document_id = mergeDialog.metadataDocumentID
         }
         if (mergeDialog.deleteOriginals) {
-          args['delete_originals'] = true
+          args.delete_originals = true
         }
         if (mergeDialog.archiveFallback) {
-          args['archive_fallback'] = true
+          args.archive_fallback = true
         }
         mergeDialog.buttonsEnabled = false
         this.executeOperation(
diff --git a/src-ui/src/app/services/rest/document.service.ts b/src-ui/src/app/services/rest/document.service.ts
index 18bfe8f67..ecde41d24 100644
--- a/src-ui/src/app/services/rest/document.service.ts
+++ b/src-ui/src/app/services/rest/document.service.ts
@@ -42,6 +42,47 @@ export enum BulkEditSourceMode {
   EXPLICIT_SELECTION = 'explicit_selection',
 }
 
+export type DocumentBulkEditMethod =
+  | 'set_correspondent'
+  | 'set_document_type'
+  | 'set_storage_path'
+  | 'add_tag'
+  | 'remove_tag'
+  | 'modify_tags'
+  | 'modify_custom_fields'
+  | 'delete'
+  | 'reprocess'
+  | 'set_permissions'
+
+export interface MergeDocumentsRequest {
+  metadata_document_id?: number
+  delete_originals?: boolean
+  archive_fallback?: boolean
+  source_mode?: BulkEditSourceMode
+}
+
+export interface EditPdfOperation {
+  page: number
+  rotate?: number
+  doc?: number
+}
+
+export interface EditPdfDocumentsRequest {
+  operations: EditPdfOperation[]
+  delete_original?: boolean
+  update_document?: boolean
+  include_metadata?: boolean
+  source_mode?: BulkEditSourceMode
+}
+
+export interface RemovePasswordDocumentsRequest {
+  password: string
+  update_document?: boolean
+  delete_original?: boolean
+  include_metadata?: boolean
+  source_mode?: BulkEditSourceMode
+}
+
 @Injectable({
   providedIn: 'root',
 })
@@ -299,7 +340,7 @@ export class DocumentService extends AbstractPaperlessService<Document> {
     return this.http.get<DocumentMetadata>(url.toString())
   }
 
-  bulkEdit(ids: number[], method: string, args: any) {
+  bulkEdit(ids: number[], method: DocumentBulkEditMethod, args: any) {
     return this.http.post(this.getResourceUrl(null, 'bulk_edit'), {
       documents: ids,
       method: method,
@@ -319,24 +360,27 @@ export class DocumentService extends AbstractPaperlessService<Document> {
     })
   }
 
-  mergeDocuments(ids: number[], args: any = {}) {
+  mergeDocuments(ids: number[], request: MergeDocumentsRequest = {}) {
     return this.http.post(this.getResourceUrl(null, 'merge'), {
       documents: ids,
-      ...args,
+      ...request,
     })
   }
 
-  editPdfDocuments(ids: number[], args: any) {
+  editPdfDocuments(ids: number[], request: EditPdfDocumentsRequest) {
     return this.http.post(this.getResourceUrl(null, 'edit_pdf'), {
       documents: ids,
-      ...args,
+      ...request,
     })
   }
 
-  removePasswordDocuments(ids: number[], args: any) {
+  removePasswordDocuments(
+    ids: number[],
+    request: RemovePasswordDocumentsRequest
+  ) {
     return this.http.post(this.getResourceUrl(null, 'remove_password'), {
       documents: ids,
-      ...args,
+      ...request,
     })
   }