diff --git a/src/__tests__/images.test.ts b/src/__tests__/images.test.ts
index 9a1a08a..8e637c9 100644
--- a/src/__tests__/images.test.ts
+++ b/src/__tests__/images.test.ts
@@ -423,7 +423,7 @@ it('010: can inject an image in a document that already contains images inserted
   `);
 
   const reportB = await createReport({
-    template: Buffer.from(reportA),
+    template: reportA,
     cmdDelimiter: '---',
     data: {
       injectImg: () => ({
diff --git a/src/main.ts b/src/main.ts
index 5581830..3c50856 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -39,7 +39,7 @@ const CONTENT_TYPES_PATH = '[Content_Types].xml' as const;
 const TEMPLATE_PATH = 'word' as const;
 const XML_FILE_REGEX = new RegExp(`${TEMPLATE_PATH}\\/[^\\/]+\\.xml`);
 
-export async function parseTemplate(template: Buffer) {
+export async function parseTemplate(template: ArrayBuffer) {
   logger.debug('Unzipping...');
   const zip = await zipLoad(template);
 
@@ -319,7 +319,7 @@ async function createReport(
  * @param delimiter the command delimiter (defaults to ['+++', '+++'])
  */
 export async function listCommands(
-  template: Buffer,
+  template: ArrayBuffer,
   delimiter?: string | [string, string]
 ): Promise<CommandSummary[]> {
   const opts: CreateReportOptions = {
@@ -371,7 +371,7 @@ export async function listCommands(
  * Extract metadata from a document, such as the number of pages or words.
  * @param template the docx template as a Buffer-like object
  */
-export async function getMetadata(template: Buffer) {
+export async function getMetadata(template: ArrayBuffer) {
   const app_xml_path = `docProps/app.xml`;
   const core_xml_path = `docProps/core.xml`;
   const zip = await zipLoad(template);
diff --git a/src/processTemplate.ts b/src/processTemplate.ts
index 2ef90a6..5b06b06 100755
--- a/src/processTemplate.ts
+++ b/src/processTemplate.ts
@@ -848,13 +848,13 @@ const imageToContext = (ctx: Context, img: Image) => {
 function validateImage(img: Image) {
   if (
     !(
-      img.data instanceof Buffer ||
+      img.data instanceof Uint8Array ||
       img.data instanceof ArrayBuffer ||
       typeof img.data === 'string'
     )
   ) {
     throw new Error(
-      'image .data property needs to be provided as Buffer, ArrayBuffer, or as a base64-encoded string'
+      'image .data property needs to be provided as Uint8Array (e.g. Buffer, ArrayBuffer), or as a base64-encoded string'
     );
   }
   if (!ImageExtensions.includes(img.extension)) {
diff --git a/src/types.ts b/src/types.ts
index 455b8ef..bad3e50 100755
--- a/src/types.ts
+++ b/src/types.ts
@@ -44,9 +44,9 @@ type RunJSFunc = (o: { sandbox: SandBox; ctx: Context }) => {
 
 export type UserOptions = {
   /**
-   * Docx file template as a NodeJS Buffer or Buffer-like object in Browsers.
+   * Docx file template as a Uint8Array (or e.g. ArrayBuffer or NodeJS Buffer).
    */
-  template: Buffer;
+  template: Uint8Array;
   /**
    * Object of data to be injected or a (async) function that resolves to the data. The function gets as an argument the contents of the QUERY command as a string.
    */
@@ -181,7 +181,7 @@ export const ImageExtensions = [
 type ImageExtension = (typeof ImageExtensions)[number];
 export type Image = {
   extension: ImageExtension;
-  data: Buffer | ArrayBuffer | string;
+  data: ArrayBuffer | string;
 };
 export type Links = { [id: string]: Link };
 type Link = { url: string };