diff --git a/src/dusted/config.py b/src/dusted/config.py
index d7c32a5..7d2ea9d 100644
--- a/src/dusted/config.py
+++ b/src/dusted/config.py
@@ -15,6 +15,7 @@ class Config:
     dustforce_path: str = r"C:\Program Files (x86)\Steam\steamapps\common\Dustforce"
     show_level: bool = True
     window_geometry: str = ""
+    dustkid_id: int | None = None
 
     @classmethod
     def read(cls) -> Config:
@@ -27,6 +28,7 @@ def read(cls) -> Config:
             dustforce_path=parser.get("DEFAULT", "dustforce_path"),
             show_level=parser.getboolean("DEFAULT", "show_level"),
             window_geometry=parser.get("DEFAULT", "window_geometry"),
+            dustkid_id=parser.getint("DEFAULT", "dustkid_id", fallback=None),
         )
 
     def write(self) -> None:
@@ -38,6 +40,7 @@ def write(self) -> None:
                 "DEFAULT": {
                     key: self._stringify_value(value)
                     for key, value in dataclasses.asdict(self).items()
+                    if value is not None
                 }
             }
         )
@@ -53,11 +56,11 @@ def _defaults(cls) -> dict[str, str]:
         return {
             field.name: cls._stringify_value(field.default)
             for field in dataclasses.fields(cls)
-            if field.default is not dataclasses.MISSING
+            if field.default is not dataclasses.MISSING and field.default is not None
         }
 
     @staticmethod
-    def _stringify_value(value: str | bool) -> str:
+    def _stringify_value(value: str | bool | int) -> str:
         """Convert a value into a string that the parser can deal with."""
 
         if isinstance(value, bool):
@@ -65,6 +68,10 @@ def _stringify_value(value: str | bool) -> str:
                 return "true"
             else:
                 return "false"
+
+        if isinstance(value, int):
+            return str(value)
+
         return value
 
 
diff --git a/src/dusted/gui.py b/src/dusted/gui.py
index b6ee2b4..ecc0ab0 100644
--- a/src/dusted/gui.py
+++ b/src/dusted/gui.py
@@ -21,6 +21,7 @@
 from dusted.jump_to_frame import JumpToFrameDialog
 from dusted.level import Level
 from dusted.level_view import LevelView
+from dusted.publish_replay import PublishReplayDialog
 from dusted.replay_diagnostics import ReplayDiagnostics
 from dusted.replay_metadata import ReplayMetadata, ReplayMetadataDialog
 from dusted.undo_stack import UndoStack
@@ -47,7 +48,9 @@ def __init__(self):
         super().__init__()
 
         # Log exceptions
-        self.report_callback_exception = lambda *args: log.error("", exc_info=args)
+        self.report_callback_exception = lambda *args: log.exception(
+            "Uncaught exception"
+        )
 
         self.level = Level("downhill")
         self.character = Character.DUSTMAN
@@ -99,6 +102,10 @@ def __init__(self):
             label="Export as nexus script...",
             command=self.export_as_nexus_script,
         )
+        file_menu.add_command(
+            label="Publish to dustkid...",
+            command=self.publish_to_dustkid,
+        )
 
         self.edit_menu = tk.Menu(menu_bar, tearoff=0)
         menu_bar.add_cascade(label="Edit", underline=0, menu=self.edit_menu)
@@ -279,17 +286,8 @@ def load_state_and_watch(self):
         if self.save_file():
             dustforce.watch_replay_load_state(self.file)
 
-    def save_file(self, save_as: bool = False):
-        if not self.file or save_as:
-            self.file = tkinter.filedialog.asksaveasfilename(
-                defaultextension=".dfreplay",
-                filetypes=[("replay files", "*.dfreplay")],
-                title="Save replay",
-            )
-            if not self.file:
-                return False
-        elif not self.undo_stack.is_modified:
-            return True
+    def _current_replay(self) -> Replay:
+        """Return a replay instance created from the current application state."""
 
         intent_streams = {
             IntentStream.X: [intents.x for intents in self.inputs],
@@ -301,12 +299,31 @@ def save_file(self, save_as: bool = False):
             IntentStream.HEAVY: [intents.heavy for intents in self.inputs],
             IntentStream.TAUNT: [intents.taunt for intents in self.inputs],
         }
-        replay = Replay(
+        return Replay(
             username=b"TAS",
             level=self.level.get().encode(),
             players=[PlayerData(self.character, intent_streams)],
         )
 
+    def save_file(self, save_as: bool = False) -> bool:
+        """
+        Save the current replay to a file.
+
+        :return: True if the file was saved.
+        """
+
+        if not self.file or save_as:
+            self.file = tkinter.filedialog.asksaveasfilename(
+                defaultextension=".dfreplay",
+                filetypes=[("replay files", "*.dfreplay")],
+                title="Save replay",
+            )
+            if not self.file:
+                return False
+        elif not self.undo_stack.is_modified:
+            return True
+
+        replay = self._current_replay()
         utils.write_replay_to_file(self.file, replay)
         self.undo_stack.set_unmodified()
 
@@ -347,6 +364,17 @@ def export_as_nexus_script(self) -> None:
             with open(filepath, "w", encoding="utf-8") as file:
                 file.write(nexus_script)
 
+    def publish_to_dustkid(self) -> None:
+        """Publish the current replay to dustkid."""
+
+        if self.undo_stack.is_modified:
+            tkinter.messagebox.showwarning(
+                message="There are unsaved changes. Save or undo the changes before publishing."
+            )
+            return
+
+        PublishReplayDialog(self, self._current_replay())
+
     def jump_to_previous_diagnostic(self) -> None:
         """Move the cursor to the next diagnostic."""
 
diff --git a/src/dusted/publish_replay.py b/src/dusted/publish_replay.py
new file mode 100644
index 0000000..646186e
--- /dev/null
+++ b/src/dusted/publish_replay.py
@@ -0,0 +1,166 @@
+import io
+import logging
+import tkinter as tk
+import tkinter.messagebox
+from enum import Enum
+
+import requests
+from dustmaker.dfwriter import DFWriter
+from dustmaker.replay import Replay
+
+from dusted.config import config
+from dusted.dialog import Dialog
+
+log = logging.getLogger(__name__)
+
+
+class ValidationError(Enum):
+    DUSTKID_ID = "Invalid dustkid ID, must be a non-negative integer."
+    TIME = "Invalid time, must be an non-negative integer number of milliseconds."
+    COMPLETION = "Invalid completion, must be one of S, A, B, C, D, X."
+    FINESSE = "Invalid finesse, must be one of S, A, B, C, D, X."
+
+
+class Score(Enum):
+    S = 5
+    A = 4
+    B = 3
+    C = 2
+    D = 1
+    X = 0
+
+
+def publish_to_dustkid(
+    replay: Replay,
+    completion: Score,
+    finesse: Score,
+    time_ms: int,
+    dustkid_id: int,
+) -> None:
+    """Publish a replay file to dustkid."""
+
+    # Strip the DF_RPL2 (username) header.
+    replay.username = b""
+
+    replay_file = io.BytesIO()
+    with DFWriter(replay_file) as writer:
+        writer.write_replay(replay)
+        replay_data = replay_file.getvalue()
+
+    url = "https://dustkid.com/backend8/add_score.php"
+    data = {
+        "level": replay.level,
+        "character": replay.players[0].character.value,
+        "score1": completion.value,
+        "score2": finesse.value,
+        "time": time_ms,
+        "user": dustkid_id,
+        "replay": replay_data,
+        "tool": "dusted",
+    }
+    response = requests.post(url, data=data)
+
+    response.raise_for_status()
+
+    if response.content == b"FAIL1":
+        raise RuntimeError("Dustkid didn't like that")
+
+
+class PublishReplayDialog(Dialog):
+    def __init__(self, parent: tk.Misc, replay: Replay) -> None:
+        super().__init__(parent)
+        self._replay = replay
+
+        dustkid_id_label = tk.Label(self, text="Dustkid ID:")
+        dustkid_id_label.grid(row=0, column=0, sticky="e")
+        self.dustkid_id_var = tk.StringVar(self)
+        dustkid_id_input = tk.Entry(self, textvariable=self.dustkid_id_var)
+        dustkid_id_input.grid(row=0, column=1, sticky="ew")
+
+        time_label = tk.Label(self, text="Time (in milliseconds):")
+        time_label.grid(row=1, column=0, sticky="e")
+        self.time_var = tk.StringVar(self)
+        time_input = tk.Entry(self, textvariable=self.time_var)
+        time_input.grid(row=1, column=1, sticky="ew")
+
+        completion_label = tk.Label(self, text="Completion:")
+        completion_label.grid(row=2, column=0, sticky="e")
+        self.completion_var = tk.StringVar(self)
+        completion_input = tk.Entry(self, textvariable=self.completion_var)
+        completion_input.grid(row=2, column=1, sticky="ew")
+
+        finesse_label = tk.Label(self, text="Finesse:")
+        finesse_label.grid(row=3, column=0, sticky="e")
+        self.finesse_var = tk.StringVar(self)
+        finesse_input = tk.Entry(self, textvariable=self.finesse_var)
+        finesse_input.grid(row=3, column=1, sticky="ew")
+
+        button = tk.Button(self, text="Publish", command=self.publish)
+        button.grid(row=4, columnspan=2)
+
+        if config.dustkid_id is not None:
+            self.dustkid_id_var.set(str(config.dustkid_id))
+
+        self.bind("<Return>", lambda e: self.publish())
+
+    def publish(self) -> None:
+        """Validate the form and publish the replay."""
+
+        errors = []
+
+        raw_dustkid_id = self.dustkid_id_var.get()
+        try:
+            dustkid_id = int(raw_dustkid_id)
+        except ValueError:
+            errors.append(ValidationError.DUSTKID_ID)
+        else:
+            if dustkid_id < 0:
+                errors.append(ValidationError.DUSTKID_ID)
+
+        raw_time = self.time_var.get()
+        try:
+            time = int(raw_time)
+        except ValueError:
+            errors.append(ValidationError.TIME)
+        else:
+            if time < 0:
+                errors.append(ValidationError.TIME)
+
+        raw_completion = self.completion_var.get()
+        try:
+            completion = Score[raw_completion.upper()]
+        except KeyError:
+            errors.append(ValidationError.COMPLETION)
+
+        raw_finesse = self.finesse_var.get()
+        try:
+            finesse = Score[raw_finesse.upper()]
+        except KeyError:
+            errors.append(ValidationError.FINESSE)
+
+        if errors:
+            tkinter.messagebox.showerror(
+                message="\n".join(error.value for error in errors)
+            )
+            return
+
+        try:
+            publish_to_dustkid(
+                replay=self._replay,
+                completion=completion,
+                finesse=finesse,
+                time_ms=time,
+                dustkid_id=dustkid_id,
+            )
+        except Exception as error:
+            log.exception("Publishing replay failed")
+            tkinter.messagebox.showerror(message=f"Publishing replay failed:\n{error}")
+            return
+
+        if config.dustkid_id != dustkid_id:
+            config.dustkid_id = dustkid_id
+            config.write()
+
+        tkinter.messagebox.showinfo(message="Replay published successfully!")
+
+        self.destroy()
diff --git a/tests/test_publish_replay.py b/tests/test_publish_replay.py
new file mode 100644
index 0000000..4e8ec44
--- /dev/null
+++ b/tests/test_publish_replay.py
@@ -0,0 +1,65 @@
+from unittest import TestCase, mock
+from unittest.mock import Mock, patch
+
+from dustmaker.replay import Character, PlayerData, Replay
+from requests import Response
+
+from dusted.publish_replay import Score, publish_to_dustkid
+
+FAILURE_RESPONSE = b"FAIL1"
+SUCCESS_RESPONSE = b"DF_GSC1\x02\x00\x00\x00\n\x00\x03\x00\n\x00\x03\x00'\x00\x00\x00\x1a\x00\x00\x00\xfc\x17\x02\x00\x00\x00\x00\x00\x06\x00Noelle\x01\x00\x00\x00'D\x05\x00|\xc0\x97\x00\x01\x00\x05\x05\x910\x00\x00\x00\x00\x00\x00\x06\x00Ukkiez\x02\x00\x00\x00\xe9\xfa\x00\x00\x04I\x87\x00\x00\x00\x05\x05\xb20\x00\x00\x00\x00\x00\x00\x06\x00Xander\x03\x00\x00\x00>)\x04\x00\xe3\x98\x89\x00\x00\x00\x05\x05\xb20\x00\x00\x00\x00\x00\x00\x07\x00indapop\x04\x00\x00\x00n\x9b\x02\x00\x7f4\x92\x00\x01\x00\x05\x05\xc30\x00\x00\x00\x00\x00\x00\n\x00magmapeach\x05\x00\x00\x00?|\x02\x00W-\x93\x00\x00\x00\x05\x05'1\x00\x00\x00\x00\x00\x00\x08\x00naijamuh\x06\x00\x00\x00\xd6\xcf\x03\x00\xab5\x93\x00\x00\x00\x05\x0581\x00\x00\x00\x00\x00\x00\x05\x00plant\x07\x00\x00\x00\xee,\x05\x00\x96X\x8e\x00\x00\x00\x05\x05Y1\x00\x00\x00\x00\x00\x00\x07\x00Zaandaa\x08\x00\x00\x00\x1a8\x00\x00x\x0fz\x00\x00\x00\x05\x05j1\x00\x00\x00\x00\x00\x00\x04\x00Tess\t\x00\x00\x00x\xe7\x03\x00i\xc6\x8a\x00\x00\x00\x05\x05j1\x00\x00\x00\x00\x00\x00\t\x00Yoda Cage\n\x00\x00\x00(\xbb\x02\x003\x15\x93\x00\x00\x00\x05\x05j1\x00\x00\x00\x00\x00\x00\x03\x00TMC&\x00\x00\x00\xb5A\x02\x00\x96\xaa|\x00\x00\x00\x05\x05\n3\x00\x00\x00\x00\x00\x00\n\x00Alexspeedy'\x00\x00\x00=x\x04\x00\xf7\xe1\x96\x00\x00\x00\x05\x05\n3\x00\x00\x00\x00\x00\x00\x07\x00Skyhawk(\x00\x00\x00Z*\x01\x00zCr\x00\x00\x00\x05\x05<3\x00\x00\x00\x00\x00\x00\x06\x00Xander\x01\x00\x00\x00>)\x04\x00\xf5\x9c\x89\x00\x00\x00\x05\x02\x92-\x00\x00\x00\x00\x00\x00\x06\x00Ukkiez\x02\x00\x00\x00\xe9\xfa\x00\x00\x98\x95\x8a\x00\x00\x00\x05\x02\x92-\x00\x00\x00\x00\x00\x00\x07\x00indapop\x03\x00\x00\x00n\x9b\x02\x00J\x08\x80\x00\x00\x00\x05\x02\x18.\x00\x00\x00\x00\x00\x00\x08\x00naijamuh\x04\x00\x00\x00\xd6\xcf\x03\x00\xc4S\x97\x00\x00\x00\x05\x029.\x00\x00\x00\x00\x00\x00\x04\x00Tess\x05\x00\x00\x00x\xe7\x03\x00|\xbe\x8a\x00\x00\x00\x05\x02J.\x00\x00\x00\x00\x00\x00\x07\x00Zaandaa\x06\x00\x00\x00\x1a8\x00\x00C\xc6\x7f\x00\x00\x00\x05\x02k.\x00\x00\x00\x00\x00\x00\t\x00YodaCage\x07\x00\x00\x00(\xbb\x02\x00\x8e\xac{\x00\x00\x00\x05\x02\xbe.\x00\x00\x00\x00\x00\x00\x0f\x00hvge archie fan\x08\x00\x00\x00L\xcc\x02\x00S4\x88\x00\x01\x00\x05\x02\x01/\x00\x00\x00\x00\x00\x00\x05\x00Wazzy\t\x00\x00\x00\x8c\x83\x01\x00\x05\xa3\x8a\x00\x00\x00\x05\x02\"/\x00\x00\x00\x00\x00\x00\x0e\x00DevTwoThousand\n\x00\x00\x00\xcc\xf9\x01\x00v\x08\x8b\x00\x00\x00\x05\x023/\x00\x00\x00\x00\x00\x00\n\x00NoLifeJoel\x19\x00\x00\x00[y\x02\x00\x16=o\x00\x00\x00\x05\x02\xc30\x00\x00\x00\x00\x00\x00\n\x00Alexspeedy\x1a\x00\x00\x00=x\x04\x00\xca\x9f\x8a\x00\x00\x00\x05\x02\xc30\x00\x00\x00\x00\x00\x00\x0e\x00arbitraryasian\x1b\x00\x00\x00\xc2I\x02\x00R#k\x00\x00\x00\x05\x02\xd40\x00\x00"
+
+
+class TestPublishReplay(TestCase):
+    def setUp(self) -> None:
+        patcher = patch("dusted.publish_replay.requests")
+        self.mock_requests = patcher.start()
+        self.addCleanup(patcher.stop)
+
+    def make_replay(self, level: str, character: Character) -> Replay:
+        return Replay(
+            username=b"TAS",
+            level=level.encode(),
+            players=[PlayerData(character=character, intents={})],
+        )
+
+    def test_success(self):
+        mock_response = Mock(spec_set=Response)
+        mock_response.content = SUCCESS_RESPONSE
+        self.mock_requests.post.return_value = mock_response
+
+        publish_to_dustkid(
+            replay=self.make_replay("downhill", Character.DUSTKID),
+            completion=Score.S,
+            finesse=Score.C,
+            time_ms=12_345,
+            dustkid_id=292925,
+        )
+
+        self.mock_requests.post.assert_called_once_with(
+            "https://dustkid.com/backend8/add_score.php",
+            data={
+                "level": b"downhill",
+                "character": 2,
+                "score1": 5,
+                "score2": 2,
+                "time": 12_345,
+                "user": 292925,
+                "replay": mock.ANY,
+                "tool": "dusted",
+            },
+        )
+
+    def test_failure(self):
+        mock_response = Mock(spec_set=Response)
+        mock_response.content = FAILURE_RESPONSE
+        self.mock_requests.post.return_value = mock_response
+
+        with self.assertRaises(RuntimeError):
+            publish_to_dustkid(
+                replay=self.make_replay("downhill", Character.DUSTKID),
+                completion=Score.S,
+                finesse=Score.C,
+                time_ms=12_345,
+                dustkid_id=292925,
+            )