diff --git a/clients/fossid-webapp/src/main/kotlin/Extensions.kt b/clients/fossid-webapp/src/main/kotlin/Extensions.kt
index 37e8f91ebf1f..386637092e72 100644
--- a/clients/fossid-webapp/src/main/kotlin/Extensions.kt
+++ b/clients/fossid-webapp/src/main/kotlin/Extensions.kt
@@ -448,6 +448,56 @@ suspend fun FossIdRestService.generateReport(
     }
 }
 
+/**
+ * Mark the given file with [path] as identified for the given [scanCode].
+ *
+ * The HTTP request is sent with [user] and [apiKey] as credentials.
+ */
+suspend fun FossIdRestService.markAsIdentified(
+    user: String,
+    apiKey: String,
+    scanCode: String,
+    path: String,
+    isDirectory: Boolean
+): EntityResponseBody<Nothing> {
+    val base64Path = base64Encoder.encodeToString(path.toByteArray())
+    val directoryFlag = if (isDirectory) "1" else "0"
+    return markAsIdentified(
+        PostRequestBody(
+            "mark_as_identified",
+            FILES_AND_FOLDERS_GROUP,
+            user,
+            apiKey,
+            mapOf("scan_code" to scanCode, "path" to base64Path, "is_directory" to directoryFlag)
+        )
+    )
+}
+
+/**
+ * Unmark the given file with [path] as identified for the given [scanCode].
+ *
+ * The HTTP request is sent with [user] and [apiKey] as credentials.
+ */
+suspend fun FossIdRestService.unmarkAsIdentified(
+    user: String,
+    apiKey: String,
+    scanCode: String,
+    path: String,
+    isDirectory: Boolean
+): EntityResponseBody<Nothing> {
+    val base64Path = base64Encoder.encodeToString(path.toByteArray())
+    val directoryFlag = if (isDirectory) "1" else "0"
+    return unmarkAsIdentified(
+        PostRequestBody(
+            "unmark_as_identified",
+            FILES_AND_FOLDERS_GROUP,
+            user,
+            apiKey,
+            mapOf("scan_code" to scanCode, "path" to base64Path, "is_directory" to directoryFlag)
+        )
+    )
+}
+
 /**
  * If this string starts with [prefix], return the string without the prefix, otherwise return [missingPrefixValue].
  */
diff --git a/clients/fossid-webapp/src/main/kotlin/FossIdRestService.kt b/clients/fossid-webapp/src/main/kotlin/FossIdRestService.kt
index 0de8135e5ce0..b1cc751cc7e4 100644
--- a/clients/fossid-webapp/src/main/kotlin/FossIdRestService.kt
+++ b/clients/fossid-webapp/src/main/kotlin/FossIdRestService.kt
@@ -265,6 +265,12 @@ interface FossIdRestService {
     @POST("api.php")
     suspend fun generateReport(@Body body: PostRequestBody): Response<ResponseBody>
 
+    @POST("api.php")
+    suspend fun markAsIdentified(@Body body: PostRequestBody): EntityResponseBody<Nothing>
+
+    @POST("api.php")
+    suspend fun unmarkAsIdentified(@Body body: PostRequestBody): EntityResponseBody<Nothing>
+
     @GET("index.php?form=login")
     suspend fun getLoginPage(): ResponseBody
 }
diff --git a/clients/fossid-webapp/src/test/assets/return-type/mappings/apiphp-mark_as_identified.json b/clients/fossid-webapp/src/test/assets/return-type/mappings/apiphp-mark_as_identified.json
new file mode 100644
index 000000000000..9b16a1aea5d7
--- /dev/null
+++ b/clients/fossid-webapp/src/test/assets/return-type/mappings/apiphp-mark_as_identified.json
@@ -0,0 +1,26 @@
+{
+  "id" : "86626b21-c67d-44d8-9861-f06283e717f3",
+  "name" : "apiphp",
+  "request" : {
+    "url" : "/api.php",
+    "method" : "POST",
+    "bodyPatterns" : [ {
+      "equalToJson" : "{  \"action\" : \"mark_as_identified\",  \"group\" : \"files_and_folders\",  \"data\" : {    \"username\":\"\",    \"key\":\"\",    \"scan_code\" : \"semver4j_20201203_090342\",    \"path\" : \"c3JjL21haW4vamF2YS9jb20vdmR1cm1vbnQvc2VtdmVyNGovUmFuZ2UuamF2YQ==\",    \"is_directory\": \"0\"  }}",
+      "ignoreArrayOrder" : true,
+      "ignoreExtraElements" : true
+    } ]
+  },
+  "response" : {
+    "status" : 200,
+    "body" : "{  \"operation\": \"files_and_folders_mark_as_identified\",  \"status\": \"1\",  \"data\": {    \"operation\": \"files_mark_as_identified\",    \"status\": \"1\",    \"data\": null,    \"message\": \"Success\"  },  \"message\": \"Success\"}",
+    "headers" : {
+      "Content-Type" : "text/html; charset=UTF-8",
+      "Date" : "Thu, 05 Dec 2021 11:54:04 GMT",
+      "Server" : "Apache/2.4.38 (Debian)",
+      "Vary" : "Accept-Encoding"
+    }
+  },
+  "uuid" : "86626b21-c67d-44d8-9861-f06283e717f3",
+  "persistent" : true,
+  "insertionIndex" : 1
+}
diff --git a/clients/fossid-webapp/src/test/assets/return-type/mappings/apiphp-unmark_as_identified.json b/clients/fossid-webapp/src/test/assets/return-type/mappings/apiphp-unmark_as_identified.json
new file mode 100644
index 000000000000..d2726ba0f2f6
--- /dev/null
+++ b/clients/fossid-webapp/src/test/assets/return-type/mappings/apiphp-unmark_as_identified.json
@@ -0,0 +1,26 @@
+{
+  "id" : "86626b21-c67d-44d8-9861-f06283e717f3",
+  "name" : "apiphp",
+  "request" : {
+    "url" : "/api.php",
+    "method" : "POST",
+    "bodyPatterns" : [ {
+      "equalToJson" : "{  \"action\" : \"unmark_as_identified\",  \"group\" : \"files_and_folders\",  \"data\" : {    \"username\":\"\",    \"key\":\"\",    \"scan_code\" : \"semver4j_20201203_090342\",    \"path\" : \"c3JjL21haW4vamF2YS9jb20vdmR1cm1vbnQvc2VtdmVyNGovUmFuZ2UuamF2YQ==\",    \"is_directory\": \"0\"  }}",
+      "ignoreArrayOrder" : true,
+      "ignoreExtraElements" : true
+    } ]
+  },
+  "response" : {
+    "status" : 200,
+    "body" : "{  \"operation\": \"files_and_folders_unmark_as_identified\",  \"status\": \"1\",  \"data\": {    \"operation\": \"files_unmark_as_identified\",    \"status\": \"1\",    \"data\": null,    \"message\": \"Success\"  },  \"message\": \"Success\"}",
+    "headers" : {
+      "Content-Type" : "text/html; charset=UTF-8",
+      "Date" : "Thu, 05 Dec 2021 11:54:04 GMT",
+      "Server" : "Apache/2.4.38 (Debian)",
+      "Vary" : "Accept-Encoding"
+    }
+  },
+  "uuid" : "86626b21-c67d-44d8-9861-f06283e717f3",
+  "persistent" : true,
+  "insertionIndex" : 1
+}
diff --git a/clients/fossid-webapp/src/test/kotlin/FossIdClientReturnTypeTest.kt b/clients/fossid-webapp/src/test/kotlin/FossIdClientReturnTypeTest.kt
index f34d2ea3e94c..78338015b2b9 100644
--- a/clients/fossid-webapp/src/test/kotlin/FossIdClientReturnTypeTest.kt
+++ b/clients/fossid-webapp/src/test/kotlin/FossIdClientReturnTypeTest.kt
@@ -40,12 +40,14 @@ import org.ossreviewtoolkit.clients.fossid.listPendingFiles
 import org.ossreviewtoolkit.clients.fossid.listScanResults
 import org.ossreviewtoolkit.clients.fossid.listScansForProject
 import org.ossreviewtoolkit.clients.fossid.listSnippets
+import org.ossreviewtoolkit.clients.fossid.markAsIdentified
 import org.ossreviewtoolkit.clients.fossid.model.Scan
 import org.ossreviewtoolkit.clients.fossid.model.identification.identifiedFiles.IdentifiedFile
 import org.ossreviewtoolkit.clients.fossid.model.identification.ignored.IgnoredFile
 import org.ossreviewtoolkit.clients.fossid.model.identification.markedAsIdentified.MarkedAsIdentifiedFile
 import org.ossreviewtoolkit.clients.fossid.model.result.FossIdScanResult
 import org.ossreviewtoolkit.clients.fossid.model.result.Snippet
+import org.ossreviewtoolkit.clients.fossid.unmarkAsIdentified
 
 private const val PROJECT_CODE_1 = "semver4j"
 private const val PROJECT_CODE_2 = "semver4j_2"
@@ -264,4 +266,28 @@ class FossIdClientReturnTypeTest : StringSpec({
             error shouldBe "Classes.TableRepository.row_not_found"
         }
     }
+
+    "A file can be marked as identified" {
+        service.markAsIdentified(
+            "",
+            "",
+            SCAN_CODE_1,
+            "src/main/java/com/vdurmont/semver4j/Range.java",
+            false
+        ).shouldNotBeNull().run {
+            checkResponse("mark file as identified")
+        }
+    }
+
+    "A file can be unmarked as identified" {
+        service.unmarkAsIdentified(
+            "",
+            "",
+            SCAN_CODE_1,
+            "src/main/java/com/vdurmont/semver4j/Range.java",
+            false
+        ).shouldNotBeNull().run {
+            checkResponse("unmark file as identified")
+        }
+    }
 })