diff --git a/src/Simplex/Chat.hs b/src/Simplex/Chat.hs
index d7963c287..d58b0a4bd 100644
--- a/src/Simplex/Chat.hs
+++ b/src/Simplex/Chat.hs
@@ -59,7 +59,7 @@ import Simplex.Chat.Store
 import Simplex.Chat.Types
 import Simplex.Chat.Util (diffInMicros, diffInSeconds)
 import Simplex.FileTransfer.Client.Presets (defaultXFTPServers)
-import Simplex.FileTransfer.Description (ValidFileDescription)
+import Simplex.FileTransfer.Description (ValidFileDescription, gb, kb, mb)
 import Simplex.FileTransfer.Protocol (FileParty (..))
 import Simplex.Messaging.Agent as Agent
 import Simplex.Messaging.Agent.Client (AgentStatsKey (..))
@@ -370,6 +370,9 @@ processChatCommand = \case
     createDirectoryIfMissing True ff
     asks filesFolder >>= atomically . (`writeTVar` Just ff)
     ok_
+  APISetXFTPConfig cfg -> do
+    asks userXFTPFileConfig >>= atomically . (`writeTVar` cfg)
+    ok_
   SetIncognito onOff -> do
     asks incognitoMode >>= atomically . (`writeTVar` onOff)
     ok_
@@ -4215,6 +4218,8 @@ chatCommandP =
       "/_resubscribe all" $> ResubscribeAllConnections,
       "/_temp_folder " *> (SetTempFolder <$> filePath),
       "/_files_folder " *> (SetFilesFolder <$> filePath),
+      "/_xftp " *> (APISetXFTPConfig <$> ("on " *> (Just <$> jsonP) <|> ("off" $> Nothing))),
+      "/xftp " *> (APISetXFTPConfig <$> ("on " *> (Just <$> xftpCfgP) <|> ("off" $> Nothing))),
       "/_db export " *> (APIExportArchive <$> jsonP),
       "/_db import " *> (APIImportArchive <$> jsonP),
       "/_db delete" $> APIDeleteStorage,
@@ -4474,6 +4479,17 @@ chatCommandP =
       logErrors <- " log=" *> onOffP <|> pure False
       let tcpTimeout = 1000000 * fromMaybe (maybe 5 (const 10) socksProxy) t_
       pure $ fullNetworkConfig socksProxy tcpTimeout logErrors
+    xftpCfgP = do
+      minFileSize <- "minFileSize=" *> fileSizeP
+      pure $ XFTPFileConfig {minFileSize}
+    -- TODO move to Utils in simplexmq
+    fileSizeP =
+      A.choice
+        [ gb <$> A.decimal <* "gb",
+          mb <$> A.decimal <* "mb",
+          kb <$> A.decimal <* "kb",
+          A.decimal
+        ]
     dbKeyP = nonEmptyKey <$?> strP
     nonEmptyKey k@(DBEncryptionKey s) = if null s then Left "empty key" else Right k
     autoAcceptP =
diff --git a/src/Simplex/Chat/Controller.hs b/src/Simplex/Chat/Controller.hs
index a4c77ca88..c1192dfe5 100644
--- a/src/Simplex/Chat/Controller.hs
+++ b/src/Simplex/Chat/Controller.hs
@@ -198,6 +198,7 @@ data ChatCommand
   | ResubscribeAllConnections
   | SetTempFolder FilePath
   | SetFilesFolder FilePath
+  | APISetXFTPConfig (Maybe XFTPFileConfig)
   | SetIncognito Bool
   | APIExportArchive ArchiveConfig
   | APIImportArchive ArchiveConfig
diff --git a/tests/ChatTests/Files.hs b/tests/ChatTests/Files.hs
index 8b776fec2..2f2d93744 100644
--- a/tests/ChatTests/Files.hs
+++ b/tests/ChatTests/Files.hs
@@ -50,6 +50,7 @@ chatFileTests = do
     xit "send and receive file to group, fully asynchronous" testAsyncGroupFileTransfer
   describe "file transfer over XFTP" $ do
     it "send and receive file" testXFTPFileTransfer
+    it "with changed XFTP config: send and receive file" testXFTPWithChangedConfig
     it "with relative paths: send and receive file" testXFTPWithRelativePaths
     it "continue receiving file after restart" testXFTPContinueRcv
 
@@ -942,6 +943,35 @@ testXFTPFileTransfer =
   where
     cfg = testCfg {xftpFileConfig = Just $ XFTPFileConfig {minFileSize = 0}, tempDir = Just "./tests/tmp"}
 
+testXFTPWithChangedConfig :: HasCallStack => FilePath -> IO ()
+testXFTPWithChangedConfig =
+  testChatCfg2 cfg aliceProfile bobProfile $ \alice bob -> do
+    withXFTPServer $ do
+      alice #$> ("/_xftp off", id, "ok")
+      alice #$> ("/_xftp on {\"minFileSize\":1024}", id, "ok")
+
+      bob #$> ("/xftp off", id, "ok")
+      bob #$> ("/xftp on minFileSize=1kb", id, "ok")
+
+      connectUsers alice bob
+
+      alice #> "/f @bob ./tests/fixtures/test.pdf"
+      alice <## "use /fc 1 to cancel sending"
+      bob <# "alice> sends file test.pdf (266.0 KiB / 272376 bytes)"
+      bob <## "use /fr 1 [<dir>/ | <path>] to receive it"
+      bob ##> "/fr 1 ./tests/tmp"
+      bob <## "saving file 1 from alice to ./tests/tmp/test.pdf"
+      -- alice <## "started sending file 1 (test.pdf) to bob" -- TODO "started uploading" ?
+      alice <## "completed sending file 1 (test.pdf) to bob"
+      bob <## "started receiving file 1 (test.pdf) from alice"
+      bob <## "completed receiving file 1 (test.pdf) from alice"
+
+      src <- B.readFile "./tests/fixtures/test.pdf"
+      dest <- B.readFile "./tests/tmp/test.pdf"
+      dest `shouldBe` src
+  where
+    cfg = testCfg {tempDir = Just "./tests/tmp"}
+
 testXFTPWithRelativePaths :: HasCallStack => FilePath -> IO ()
 testXFTPWithRelativePaths =
   testChatCfg2 cfg aliceProfile bobProfile $ \alice bob -> do