diff --git a/apps/website/screens/components/file-input/code/FileInputCodePage.tsx b/apps/website/screens/components/file-input/code/FileInputCodePage.tsx
index 736427146c..a7a84529bf 100644
--- a/apps/website/screens/components/file-input/code/FileInputCodePage.tsx
+++ b/apps/website/screens/components/file-input/code/FileInputCodePage.tsx
@@ -188,6 +188,21 @@ const sections = [
               <TableCode>false</TableCode>
             </td>
           </tr>
+          <tr>
+            <td>
+              <DxcFlex direction="column" gap="var(--spacing-gap-xs)" alignItems="baseline">
+                <StatusBadge status="new" />
+                size
+              </DxcFlex>
+            </td>
+            <td>
+              <TableCode>'medium' | 'fillParent'</TableCode>
+            </td>
+            <td>Size of the component.</td>
+            <td>
+              <TableCode>'medium'</TableCode>
+            </td>
+          </tr>
           <tr>
             <td>tabIndex</td>
             <td>
diff --git a/packages/lib/src/file-input/FileInput.stories.tsx b/packages/lib/src/file-input/FileInput.stories.tsx
index 67b5a16fba..92c655b912 100644
--- a/packages/lib/src/file-input/FileInput.stories.tsx
+++ b/packages/lib/src/file-input/FileInput.stories.tsx
@@ -2,6 +2,7 @@ import { Meta, StoryObj } from "@storybook/react-vite";
 import ExampleContainer from "../../.storybook/components/ExampleContainer";
 import Title from "../../.storybook/components/Title";
 import DxcFileInput from "./FileInput";
+import DxcContainer from "../container/Container";
 
 export default {
   title: "File Input",
@@ -510,6 +511,33 @@ const FileInput = () => (
         margin="xxlarge"
       />
     </ExampleContainer>
+    <Title title="Sizes" theme="light" level={3} />
+    <ExampleContainer>
+      <Title title="fillParent size" theme="light" level={4} />
+      <DxcContainer width="200px">
+        <DxcFileInput
+          label="File input"
+          helperText="Please select files"
+          value={fileExample}
+          callbackFile={() => {}}
+          mode="filedrop"
+          size="fillParent"
+        />
+      </DxcContainer>
+    </ExampleContainer>
+    <ExampleContainer>
+      <Title title="fillParent size" theme="light" level={4} />
+      <DxcContainer width="200px">
+        <DxcFileInput
+          label="File input"
+          helperText="Please select files"
+          value={fileExample}
+          callbackFile={() => {}}
+          mode="dropzone"
+          size="fillParent"
+        />
+      </DxcContainer>
+    </ExampleContainer>
   </>
 );
 // const EllipsisError = () => {
diff --git a/packages/lib/src/file-input/FileInput.tsx b/packages/lib/src/file-input/FileInput.tsx
index bb05aee54a..d60bfc083d 100644
--- a/packages/lib/src/file-input/FileInput.tsx
+++ b/packages/lib/src/file-input/FileInput.tsx
@@ -9,7 +9,11 @@ import { getFilePreview, isFileIncluded } from "./utils";
 import HelperText from "../styles/forms/HelperText";
 import Label from "../styles/forms/Label";
 
-const FileInputContainer = styled.div<{ margin: FileInputPropsType["margin"] }>`
+const FileInputContainer = styled.div<{
+  margin: FileInputPropsType["margin"];
+  mode: FileInputPropsType["mode"];
+  size: FileInputPropsType["size"];
+}>`
   display: flex;
   flex-direction: column;
   margin: ${(props) => (props.margin && typeof props.margin !== "object" ? spaces[props.margin] : "0px")};
@@ -21,7 +25,7 @@ const FileInputContainer = styled.div<{ margin: FileInputPropsType["margin"] }>`
     props.margin && typeof props.margin === "object" && props.margin.bottom ? spaces[props.margin.bottom] : ""};
   margin-left: ${(props) =>
     props.margin && typeof props.margin === "object" && props.margin.left ? spaces[props.margin.left] : ""};
-  width: fit-content;
+  width: ${(props) => (props.mode !== "file" && props.size === "fillParent" ? "100%" : "fit-content")};
 `;
 
 const FileContainer = styled.div<{ singleFileMode: boolean }>`
@@ -41,6 +45,7 @@ const FileItemListContainer = styled.div`
   display: flex;
   flex-direction: column;
   row-gap: var(--spacing-gap-xs);
+  width: 100%;
 `;
 
 const Container = styled.div`
@@ -54,6 +59,7 @@ const DragDropArea = styled.div<{
   mode: FileInputPropsType["mode"];
   disabled: FileInputPropsType["disabled"];
   isDragging: boolean;
+  size: FileInputPropsType["size"];
 }>`
   box-sizing: border-box;
   display: flex;
@@ -62,7 +68,7 @@ const DragDropArea = styled.div<{
       ? "flex-direction: row; column-gap: var(--spacing-gap-s);"
       : "justify-content: center; flex-direction: column; row-gap: var(--spacing-gap-s); height: 160px;"}
   align-items: center;
-  width: 320px;
+  width: ${(props) => (props.size === "fillParent" ? "100%" : "320px")};
   padding: ${(props) => (props.mode === "filedrop" ? `var(--spacing-padding-xxs)` : "var(--spacing-padding-m)")};
   overflow: hidden;
   border-radius: var(--border-radius-m);
@@ -116,6 +122,7 @@ const DxcFileInput = forwardRef<RefType, FileInputPropsType>(
       multiple = true,
       disabled = false,
       callbackFile,
+      size = "medium",
       value,
       margin,
       tabIndex = 0,
@@ -230,7 +237,7 @@ const DxcFileInput = forwardRef<RefType, FileInputPropsType>(
     }, [value]);
 
     return (
-      <FileInputContainer margin={margin} ref={ref}>
+      <FileInputContainer margin={margin} ref={ref} mode={mode} size={size}>
         {label && (
           <Label disabled={disabled} hasMargin={!helperText} htmlFor={fileInputId}>
             {label} {optional && <span>{translatedLabels.formFields.optionalLabel}</span>}
@@ -275,6 +282,7 @@ const DxcFileInput = forwardRef<RefType, FileInputPropsType>(
                     onDelete={onDelete}
                     tabIndex={tabIndex}
                     key={`file-${index}`}
+                    size={size}
                   />
                 ))}
               </FileItemListContainer>
@@ -295,6 +303,7 @@ const DxcFileInput = forwardRef<RefType, FileInputPropsType>(
             <DragDropArea
               isDragging={isDragging}
               disabled={disabled}
+              size={size}
               mode={mode}
               onDrop={handleDrop}
               onDragEnter={handleDragIn}
@@ -337,6 +346,7 @@ const DxcFileInput = forwardRef<RefType, FileInputPropsType>(
                     onDelete={onDelete}
                     tabIndex={tabIndex}
                     key={`file-${index}`}
+                    size={size}
                   />
                 ))}
               </FileItemListContainer>
diff --git a/packages/lib/src/file-input/FileItem.tsx b/packages/lib/src/file-input/FileItem.tsx
index 149b7a948b..5f3a577883 100644
--- a/packages/lib/src/file-input/FileItem.tsx
+++ b/packages/lib/src/file-input/FileItem.tsx
@@ -18,12 +18,13 @@ const MainContainer = styled.div<{
   error: FileItemProps["error"];
   singleFileMode: FileItemProps["singleFileMode"];
   showPreview: FileItemProps["showPreview"];
+  size: FileItemProps["size"];
 }>`
   box-sizing: border-box;
   display: flex;
   align-items: center;
   gap: var(--spacing-gap-m);
-  width: ${(props) => (props.singleFileMode ? "230px" : "320px")};
+  width: ${(props) => (props.size === "fillParent" ? "100%" : props.singleFileMode ? "230px" : "320px")};
   height: ${(props) => (props.singleFileMode || !props.showPreview) && "var(--height-m)"};
   padding: ${(props) =>
     props.showPreview && !props.singleFileMode
@@ -80,12 +81,15 @@ const FileName = styled.span`
   text-overflow: ellipsis;
 `;
 
-const ErrorMessageContainer = styled.div<{ singleFileMode: FileItemProps["singleFileMode"] }>`
+const ErrorMessageContainer = styled.div<{
+  singleFileMode: FileItemProps["singleFileMode"];
+  size: FileItemProps["size"];
+}>`
   display: flex;
   align-items: center;
   gap: var(--spacing-gap-xs);
   color: var(--color-fg-error-medium);
-  max-width: ${(props) => (props.singleFileMode ? "230px" : "320px")};
+  max-width: ${(props) => (props.size === "fillParent" ? "100%" : props.singleFileMode ? "230px" : "320px")};
 `;
 const ErrorIcon = styled.span`
   display: flex;
@@ -114,6 +118,7 @@ const FileItem = ({
   type,
   onDelete,
   tabIndex,
+  size = "medium",
 }: FileItemProps): JSX.Element => {
   const translatedLabels = useContext(HalstackLanguageContext);
   const [hasTooltip, setHasTooltip] = useState(false);
@@ -126,7 +131,7 @@ const FileItem = ({
 
   return (
     <ListItem>
-      <MainContainer error={error} singleFileMode={singleFileMode} showPreview={showPreview}>
+      <MainContainer error={error} singleFileMode={singleFileMode} showPreview={showPreview} size={size}>
         {showPreview &&
           (type.includes("image") ? (
             <ImagePreview src={preview} alt={`Preview of ${fileName}`} />
@@ -150,7 +155,7 @@ const FileItem = ({
       </MainContainer>
       {error && (
         <TooltipWrapper condition={hasTooltip} label={error}>
-          <ErrorMessageContainer role="alert" aria-live="assertive" singleFileMode={singleFileMode}>
+          <ErrorMessageContainer role="alert" aria-live="assertive" singleFileMode={singleFileMode} size={size}>
             <ErrorIcon>
               <DxcIcon icon="filled_error" />
             </ErrorIcon>
diff --git a/packages/lib/src/file-input/types.ts b/packages/lib/src/file-input/types.ts
index a901167918..1028ff0c2f 100644
--- a/packages/lib/src/file-input/types.ts
+++ b/packages/lib/src/file-input/types.ts
@@ -68,6 +68,10 @@ type CommonProps = {
    * If true, if the file is an image, a preview of it will be shown. If not, an icon refering to the file type will be shown.
    */
   showPreview?: boolean;
+  /**
+   * Size of the component.
+   */
+  size?: "medium" | "fillParent";
   /**
    * Value of the tabindex attribute.
    */
@@ -125,6 +129,7 @@ export type FileItemProps = {
   singleFileMode: boolean;
   tabIndex: number;
   type: string;
+  size: "medium" | "fillParent";
 };
 
 export default Props;