diff --git a/api-reports/2_12.txt b/api-reports/2_12.txt
index e57d886a6..2b1199232 100644
--- a/api-reports/2_12.txt
+++ b/api-reports/2_12.txt
@@ -2291,7 +2291,18 @@ FocusEventInit[JT] var scoped: js.UndefOr[Boolean]
 FocusEventInit[JT] var view: js.UndefOr[Window]
 FocusOptions[JT] var focusVisible: js.UndefOr[Boolean]
 FocusOptions[JT] var preventScroll: js.UndefOr[Boolean]
-FormData[JC] def append(name: js.Any, value: js.Any, blobName: String?): Unit
+FormData[JC] def append(name: String, value: Blob, blobName: String?): Unit
+FormData[JC] def append(name: String, value: String): Unit
+FormData[JC] def delete(name: String): Unit
+FormData[JC] def entries(): js.Iterator[js.Tuple2[String, String | Blob]]
+FormData[JC] def get(name: String): String | Blob
+FormData[JC] def getAll(name: String): js.Array[String | Blob]
+FormData[JC] def has(name: String): Boolean
+FormData[JC] @JSName(js.Symbol.iterator) override def jsIterator(): js.Iterator[js.Tuple2[String, String | Blob]]
+FormData[JC] def keys(): js.Iterator[String]
+FormData[JC] def set(name: String, value: Blob, blobName: String?): Unit
+FormData[JC] def set(name: String, value: String): Unit
+FormData[JC] def values(): js.Iterator[String | Blob]
 FormData[JO]
 FrameType[JT]
 FrameType[SO] val auxiliary: FrameType
diff --git a/api-reports/2_13.txt b/api-reports/2_13.txt
index e57d886a6..2b1199232 100644
--- a/api-reports/2_13.txt
+++ b/api-reports/2_13.txt
@@ -2291,7 +2291,18 @@ FocusEventInit[JT] var scoped: js.UndefOr[Boolean]
 FocusEventInit[JT] var view: js.UndefOr[Window]
 FocusOptions[JT] var focusVisible: js.UndefOr[Boolean]
 FocusOptions[JT] var preventScroll: js.UndefOr[Boolean]
-FormData[JC] def append(name: js.Any, value: js.Any, blobName: String?): Unit
+FormData[JC] def append(name: String, value: Blob, blobName: String?): Unit
+FormData[JC] def append(name: String, value: String): Unit
+FormData[JC] def delete(name: String): Unit
+FormData[JC] def entries(): js.Iterator[js.Tuple2[String, String | Blob]]
+FormData[JC] def get(name: String): String | Blob
+FormData[JC] def getAll(name: String): js.Array[String | Blob]
+FormData[JC] def has(name: String): Boolean
+FormData[JC] @JSName(js.Symbol.iterator) override def jsIterator(): js.Iterator[js.Tuple2[String, String | Blob]]
+FormData[JC] def keys(): js.Iterator[String]
+FormData[JC] def set(name: String, value: Blob, blobName: String?): Unit
+FormData[JC] def set(name: String, value: String): Unit
+FormData[JC] def values(): js.Iterator[String | Blob]
 FormData[JO]
 FrameType[JT]
 FrameType[SO] val auxiliary: FrameType
diff --git a/dom/src/main/scala/org/scalajs/dom/FormData.scala b/dom/src/main/scala/org/scalajs/dom/FormData.scala
index 6e0735561..fe73f6633 100644
--- a/dom/src/main/scala/org/scalajs/dom/FormData.scala
+++ b/dom/src/main/scala/org/scalajs/dom/FormData.scala
@@ -8,6 +8,7 @@ package org.scalajs.dom
 
 import scala.scalajs.js
 import scala.scalajs.js.annotation._
+import scala.scalajs.js.|
 
 /** XMLHttpRequest Level 2 adds support for the new FormData interface. FormData objects provide a way to easily
   * construct a set of key/value pairs representing form fields and their values, which can then be easily sent using
@@ -15,10 +16,108 @@ import scala.scalajs.js.annotation._
   */
 @js.native
 @JSGlobal
-class FormData(form: HTMLFormElement = js.native) extends js.Object {
+class FormData extends js.Iterable[js.Tuple2[String, String | Blob]] {
 
-  /** Appends a key/value pair to the FormData object. */
-  def append(name: js.Any, value: js.Any, blobName: String = js.native): Unit = js.native
+  def this(form: HTMLFormElement) = this()
+
+  def this(form: HTMLFormElement, submitter: HTMLElement) = this()
+
+  /** The `append()` method of the `FormData` interface appends a new value onto an existing key inside a `FormData`
+    * object, or adds the key if it does not already exist.
+    *
+    * @param name
+    *   The name of the field whose data is contained in value.
+    * @param value
+    *   The field's value. This can be a string or `Blob` (including subclasses such as File). If none of these are
+    *   specified the value is converted to a string.
+    */
+  def append(name: String, value: String): Unit = js.native
+
+  /** The `append()` method of the `FormData` interface appends a new value onto an existing key inside a `FormData`
+    * object, or adds the key if it does not already exist.
+    *
+    * @param name
+    *   The name of the field whose data is contained in value.
+    * @param value
+    *   The field's value. This can be a string or `Blob` (including subclasses such as File). If none of these are
+    *   specified the value is converted to a string.
+    * @param blobName
+    *   The filename reported to the server (a string), when a `Blob` or `File` is passed as the second parameter. The
+    *   default filename for `Blob` objects is "blob". The default filename for `File` objects is the file's filename.
+    */
+  def append(name: String, value: Blob, blobName: String = js.native): Unit = js.native
+
+  /** The `delete()` method of the `FormData` interface deletes a key and its value(s) from a `FormData` object.
+    * @param name
+    *   The name of the key you want to delete.
+    */
+  def delete(name: String): Unit = js.native
+
+  /** The `get()` method of the `FormData` interface returns the first value associated with a given key from within a
+    * `FormData` object. If you expect multiple values and want all of them, use the `getAll()` method instead.
+    *
+    * @param name
+    *   A string representing the name of the key you want to retrieve.
+    * @return
+    *   A value whose key matches the specified name. Otherwise, `null`.
+    */
+  def get(name: String): String | Blob = js.native
+
+  /** The `has()` method of the `FormData` interface returns whether a `FormData` object contains a certain key.
+    *
+    * @param name
+    *   A string representing the name of the key you want to test for.
+    * @return
+    *   `true` if a key of `FormData` matches the specified name. Otherwise, `false`.
+    */
+  def has(name: String): Boolean = js.native
+
+  /** The `set()` method of the `FormData` interface sets a new value for an existing key inside a `FormData` object, or
+    * adds the key/value if it does not already exist.
+    *
+    * @param name
+    *   The name of the field whose data is contained in value.
+    * @param value
+    *   The field's value.
+    */
+  def set(
+      name: String, value: String
+  ): Unit = js.native
+
+  /** The `set()` method of the `FormData` interface sets a new value for an existing key inside a `FormData` object, or
+    * adds the key/value if it does not already exist.
+    *
+    * @param name
+    *   The name of the field whose data is contained in value.
+    * @param value
+    *   The field's value.
+    */
+  def set(
+      name: String, value: Blob, blobName: String = js.native
+  ): Unit = js.native
+
+  @JSName(js.Symbol.iterator)
+  override def jsIterator(): js.Iterator[js.Tuple2[String, String | Blob]] = js.native
+
+  /** The `FormData.entries()` method returns an iterator which iterates through all key/value pairs contained in the
+    * `FormData`. The key of each pair is a string object, and the value is either a string or a `Blob`.
+    */
+  def entries(): js.Iterator[js.Tuple2[String, String | Blob]] = js.native
+
+  /** The `getAll()` method of the `FormData` interface returns all the values associated with a given key from within a
+    * `FormData` object.
+    */
+  def getAll(name: String): js.Array[String | Blob] = js.native
+
+  /** The `FormData.keys()` method returns an iterator which iterates through all keys contained in the `FormData`. The
+    * keys are strings.
+    */
+  def keys(): js.Iterator[String] = js.native
+
+  /** The `FormData.values()` method returns an iterator which iterates through all values contained in the `FormData`.
+    * The values are strings or `Blob` objects.
+    */
+  def values(): js.Iterator[String | Blob] = js.native
 }
 
 @js.native