diff --git a/src/OneBlinkUploader.ts b/src/OneBlinkUploader.ts
index be7bffc..1c9b4db 100644
--- a/src/OneBlinkUploader.ts
+++ b/src/OneBlinkUploader.ts
@@ -354,4 +354,48 @@ export default class OneBlinkUploader {
       isPublic: true,
     })
   }
+
+  /**
+   * Upload form prefill data.
+   *
+   * #### Example
+   *
+   * ```ts
+   * const abortController = new AbortController()
+   * const result = await uploader.uploadPrefillData({
+   *   onProgress: (progress) => {
+   *     // ...
+   *   },
+   *   data: {
+   *     field1: 'abc',
+   *     field2: 123,
+   *   },
+   *   formId: 12,
+   *   abortSignal: abortController.signal,
+   * })
+   * ```
+   *
+   * @param data The prefill upload data and options
+   * @returns The upload result
+   */
+  async uploadPrefillData({
+    formId,
+    prefillData,
+    onProgress,
+    abortSignal,
+  }: UploadOptions & {
+    /** The identifier for the form that the prefill data is associated with */
+    formId: number
+    /** The prefill data to upload */
+    prefillData: SubmissionTypes.NewS3SubmissionData['submission']
+  }) {
+    return await uploadToS3({
+      ...this,
+      contentType: 'application/json',
+      body: JSON.stringify(prefillData),
+      key: `forms/${formId}/pre-fill`,
+      abortSignal,
+      onProgress,
+    })
+  }
 }