diff --git a/gui/Launch SynthID Cleaner.command b/gui/Launch SynthID Cleaner.command
new file mode 100755
index 0000000..52ac47f
--- /dev/null
+++ b/gui/Launch SynthID Cleaner.command	
@@ -0,0 +1,11 @@
+#!/bin/bash
+cd "$(dirname "$0")"
+if [ ! -d venv ]; then
+  python3 -m venv venv
+  source venv/bin/activate
+  pip install --quiet --upgrade pip
+  pip install --quiet -r requirements-gui.txt
+else
+  source venv/bin/activate
+fi
+python gui.py
diff --git a/gui/README.md b/gui/README.md
new file mode 100644
index 0000000..e9c1987
--- /dev/null
+++ b/gui/README.md
@@ -0,0 +1,41 @@
+# SynthID Cleaner (GUI)
+
+A small drag-and-drop desktop app around this repo's V3 spectral bypass
+(`src/extraction/synthid_bypass.py`). Useful for e.g. removing the SynthID
+watermark left behind after using generative AI to restore old photographs.
+
+- Drop images in, get cleaned copies out — no command line needed after setup.
+- Optionally strips all EXIF/XMP/IPTC metadata from the output (including any
+  AI-generation provenance tags such as C2PA content credentials or IPTC
+  `DigitalSourceType`), by rebuilding the file from raw pixel data.
+- Runs fully offline. No network calls, no telemetry.
+- Uses V3 (pure signal processing — numpy/scipy/opencv only, no PyTorch
+  required, no GPU needed).
+
+## Setup
+
+```bash
+cd gui
+python3 -m venv venv
+source venv/bin/activate
+pip install -r requirements-gui.txt
+```
+
+## Run
+
+Double-click `Launch SynthID Cleaner.command`, or from the terminal:
+
+```bash
+cd gui
+source venv/bin/activate
+python gui.py
+```
+
+The first double-click sets up the venv automatically if it doesn't exist yet.
+
+## Notes
+
+- Reads the codebook from `../artifacts/spectral_codebook_v3.npz` (already in
+  this repo) — no extra downloads.
+- Subject to this repo's [LICENSE](../LICENSE): non-commercial use, with
+  required attribution to the original author.
diff --git a/gui/gui.py b/gui/gui.py
new file mode 100644
index 0000000..37f80dc
--- /dev/null
+++ b/gui/gui.py
@@ -0,0 +1,212 @@
+#!/usr/bin/env python3
+"""
+SynthID Cleaner — drag-and-drop GUI around the V3 spectral bypass in this repo.
+
+Removes Google SynthID's invisible watermark from images (e.g. AI-restored
+old photographs), and optionally strips EXIF/XMP/IPTC metadata (including any
+AI-generation provenance tags such as C2PA content credentials or IPTC
+DigitalSourceType). No network calls, no telemetry — everything runs locally.
+"""
+import os
+import sys
+import threading
+import traceback
+from pathlib import Path
+
+REPO_DIR = Path(__file__).resolve().parent.parent
+sys.path.insert(0, str(REPO_DIR / "src" / "extraction"))
+
+import numpy as np
+import tkinter as tk
+from tkinter import filedialog, ttk
+
+try:
+    from tkinterdnd2 import DND_FILES, TkinterDnD
+    HAS_DND = True
+except ImportError:
+    HAS_DND = False
+
+from PIL import Image
+from synthid_bypass import SynthIDBypass, SpectralCodebook
+
+CODEBOOK_PATH = REPO_DIR / "artifacts" / "spectral_codebook_v3.npz"
+IMAGE_EXTS = {".png", ".jpg", ".jpeg", ".bmp", ".tif", ".tiff", ".webp"}
+
+
+def strip_metadata(path: str):
+    """Rebuild the file from raw pixel data so no EXIF/XMP/IPTC/ICC/GPS
+    chunk survives — including any AI-generation provenance tags
+    (e.g. C2PA content credentials, IPTC DigitalSourceType, Software tag).
+    """
+    im = Image.open(path)
+    arr = np.array(im)
+    clean = Image.fromarray(arr, mode=im.mode)
+    clean.save(path)
+
+
+def parse_dnd_paths(data: str):
+    """Tk's dnd event data is a space-joined, brace-quoted path list."""
+    paths, buf, in_brace = [], "", False
+    for ch in data:
+        if ch == "{":
+            in_brace = True
+        elif ch == "}":
+            in_brace = False
+        elif ch == " " and not in_brace:
+            if buf:
+                paths.append(buf)
+                buf = ""
+        else:
+            buf += ch
+    if buf:
+        paths.append(buf)
+    return paths
+
+
+class App:
+    def __init__(self, root):
+        self.root = root
+        root.title("SynthID Cleaner")
+        root.geometry("560x480")
+        root.minsize(480, 400)
+
+        self.strength = tk.StringVar(value="aggressive")
+        self.strip_meta = tk.BooleanVar(value=True)
+        self.out_dir = tk.StringVar(value=str(Path.home() / "Desktop" / "synthid-cleaned"))
+        self.status = tk.StringVar(value="Loading codebook…")
+        self.queue = []
+
+        self._build_ui()
+        self.root.after(100, self._load_codebook)
+
+    def _build_ui(self):
+        pad = {"padx": 10, "pady": 6}
+
+        drop_text = (
+            "Drag images here\n(or click to choose files)"
+            if HAS_DND else
+            "Click to choose images"
+        )
+        self.drop = tk.Label(
+            self.root, text=drop_text, relief="groove", bd=2,
+            font=("Helvetica", 14), fg="#444", height=8, bg="#f4f4f4",
+            cursor="hand2",
+        )
+        self.drop.pack(fill="both", expand=True, **pad)
+        self.drop.bind("<Button-1>", lambda e: self._choose_files())
+
+        if HAS_DND:
+            self.drop.drop_target_register(DND_FILES)
+            self.drop.dnd_bind("<<Drop>>", self._on_drop)
+
+        row = tk.Frame(self.root)
+        row.pack(fill="x", **pad)
+        tk.Label(row, text="Strength:").pack(side="left")
+        ttk.OptionMenu(
+            row, self.strength, self.strength.get(),
+            "gentle", "moderate", "aggressive", "maximum",
+        ).pack(side="left", padx=8)
+        tk.Checkbutton(
+            row, text="Strip EXIF/XMP/IPTC metadata",
+            variable=self.strip_meta,
+        ).pack(side="left", padx=8)
+
+        out_row = tk.Frame(self.root)
+        out_row.pack(fill="x", **pad)
+        tk.Label(out_row, text="Save to:").pack(side="left")
+        tk.Entry(out_row, textvariable=self.out_dir).pack(
+            side="left", fill="x", expand=True, padx=8)
+        tk.Button(out_row, text="Browse…", command=self._choose_out_dir).pack(side="left")
+
+        self.progress = ttk.Progressbar(self.root, mode="determinate")
+        self.progress.pack(fill="x", **pad)
+
+        tk.Label(self.root, textvariable=self.status, anchor="w",
+                 wraplength=520, justify="left").pack(fill="x", **pad)
+
+        if not HAS_DND:
+            tk.Label(
+                self.root,
+                text="(tkinterdnd2 not installed — using file picker instead of drag-and-drop)",
+                fg="#888", font=("Helvetica", 10),
+            ).pack(**pad)
+
+    def _load_codebook(self):
+        def work():
+            try:
+                self.bypass = SynthIDBypass()
+                self.codebook = SpectralCodebook()
+                self.codebook.load(str(CODEBOOK_PATH))
+                self.root.after(0, lambda: self.status.set(
+                    "Ready. Drag images in or click the box above."))
+            except Exception as e:
+                self.root.after(0, lambda: self.status.set(f"Failed to load codebook: {e}"))
+        threading.Thread(target=work, daemon=True).start()
+
+    def _choose_out_dir(self):
+        d = filedialog.askdirectory(initialdir=self.out_dir.get() or str(Path.home()))
+        if d:
+            self.out_dir.set(d)
+
+    def _choose_files(self):
+        paths = filedialog.askopenfilenames(
+            title="Choose images",
+            filetypes=[("Images", "*.png *.jpg *.jpeg *.bmp *.tif *.tiff *.webp")],
+        )
+        if paths:
+            self._process(list(paths))
+
+    def _on_drop(self, event):
+        paths = [p for p in parse_dnd_paths(event.data)
+                 if Path(p).suffix.lower() in IMAGE_EXTS]
+        if paths:
+            self._process(paths)
+
+    def _process(self, paths):
+        out_dir = Path(self.out_dir.get())
+        out_dir.mkdir(parents=True, exist_ok=True)
+        strength = self.strength.get()
+        do_strip_meta = self.strip_meta.get()
+
+        self.drop.config(state="disabled")
+        self.progress.config(maximum=len(paths), value=0)
+
+        def work():
+            done = 0
+            errors = []
+            for p in paths:
+                src = Path(p)
+                dst = out_dir / f"{src.stem}_clean{src.suffix}"
+                self.root.after(0, lambda s=src.name: self.status.set(f"Cleaning {s}…"))
+                try:
+                    self.bypass.bypass_v3_file(
+                        str(src), str(dst), self.codebook,
+                        strength=strength, verify=False,
+                    )
+                    if do_strip_meta:
+                        strip_metadata(str(dst))
+                except Exception as e:
+                    errors.append(f"{src.name}: {e}")
+                    traceback.print_exc()
+                done += 1
+                self.root.after(0, lambda d=done: self.progress.config(value=d))
+
+            def finish():
+                msg = f"Done: {done - len(errors)}/{len(paths)} cleaned → {out_dir}"
+                if errors:
+                    msg += f"\n{len(errors)} failed: " + "; ".join(errors[:3])
+                self.status.set(msg)
+                self.drop.config(state="normal")
+            self.root.after(0, finish)
+
+        threading.Thread(target=work, daemon=True).start()
+
+
+def main():
+    root = TkinterDnD.Tk() if HAS_DND else tk.Tk()
+    App(root)
+    root.mainloop()
+
+
+if __name__ == "__main__":
+    main()
diff --git a/gui/requirements-gui.txt b/gui/requirements-gui.txt
new file mode 100644
index 0000000..7e5713f
--- /dev/null
+++ b/gui/requirements-gui.txt
@@ -0,0 +1,5 @@
+numpy
+scipy
+opencv-python-headless
+pillow
+tkinterdnd2