diff --git a/.gitignore b/.gitignore
index 72cc1e3..d4e7ac8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,6 +21,9 @@ env/
 *.egg-info/
 dist/
 build/
+flatpak-build/
+flatpak-repo/
+*.flatpak
 
 # Test caches
 .pytest_cache/
diff --git a/README.md b/README.md
index 9add4bb..fef47dc 100644
--- a/README.md
+++ b/README.md
@@ -57,7 +57,7 @@ Not implemented yet:
 - [docker-compose.yml](docker-compose.yml) — local deployment
 - [requirements.txt](requirements.txt) — Python dependencies
 - [client.py](client.py) — minimal CLI client
-- [gtk_client.py](gtk_client.py) — GTK4 desktop client
+- [cellar-gtk.py](cellar-gtk.py) — GTK4 desktop client
 - [app/main.py](app/main.py) — API routes
 - [app/models.py](app/models.py) — SQLAlchemy model
 - [app/schemas.py](app/schemas.py) — API response schemas
@@ -163,6 +163,56 @@ Interactive API docs are available at:
 
 ---
 
+## Flatpak package
+
+The repository now includes a Flatpak manifest for the GTK client:
+
+- [net.enne2.Cellar.yaml](net.enne2.Cellar.yaml)
+
+Flatpak packaging assets are stored in [flatpak/](flatpak/):
+
+- desktop entry
+- AppStream metadata
+- launcher script
+- icon generated from [cellar.jpg](cellar.jpg)
+
+Typical local build flow:
+
+1. install `flatpak-builder`
+2. install the required runtimes:
+   - `org.gnome.Platform//47`
+   - `org.gnome.Sdk//47`
+3. run:
+
+`flatpak-builder --user --install --force-clean flatpak-build net.enne2.Cellar.yaml`
+
+Then launch it with:
+
+`flatpak run net.enne2.Cellar`
+
+To export a private Flatpak repository and a single-file bundle, use:
+
+`./scripts/build-flatpak-repo.sh`
+
+This creates:
+
+- `flatpak-repo/` — OSTree/Flatpak repository ready to publish
+- `dist/net.enne2.Cellar.flatpak` — installable Flatpak bundle
+
+### Publish on `brain.local`
+
+If `brain.local` serves static files, copy the generated repository there, for example:
+
+`./scripts/publish-flatpak-repo.sh brain.local /var/www/html/flatpak/cellar`
+
+Then clients can add the remote and install the app with:
+
+`flatpak remote-add --if-not-exists --user --no-gpg-verify brain-local http://brain.local/flatpak/cellar`
+
+`flatpak install --user brain-local net.enne2.Cellar`
+
+---
+
 ## Environment configuration
 
 Current environment variables used by the API container:
@@ -257,7 +307,7 @@ Use a custom Bottles directory:
 
 Run:
 
-`python gtk_client.py`
+`python cellar-gtk.py`
 
 The GUI lets you:
 
diff --git a/cellar-gtk.py b/cellar-gtk.py
index 6d7f2a5..ada6519 100755
--- a/cellar-gtk.py
+++ b/cellar-gtk.py
@@ -42,6 +42,7 @@ gi.require_version("Adw", "1")
 from gi.repository import Adw, Gdk, GLib, Gtk  # type: ignore[import-not-found]
 
 # ── Constants ───────────────────────────────────────────────────
+APP_ID = "net.enne2.Cellar"
 CONFIG_PATH = Path.home() / ".config" / "cellar" / "gtk_client.json"
 
 APP_CSS = """\
@@ -448,6 +449,7 @@ class CellarWindow(Adw.ApplicationWindow):
 
     def __init__(self, app: Adw.Application):
         super().__init__(application=app, title="Cellar")
+        self.set_icon_name(APP_ID)
         self.config = load_config()
         self.settings_window: SettingsWindow | None = None
         self.rows: list[ArchiveRow] = []
@@ -824,7 +826,7 @@ class CellarWindow(Adw.ApplicationWindow):
 # ── Application ─────────────────────────────────────────────────
 class CellarApplication(Adw.Application):
     def __init__(self) -> None:
-        super().__init__(application_id="com.cellar.gtkclient")
+        super().__init__(application_id=APP_ID)
 
     def do_activate(self) -> None:
         _load_css()
diff --git a/flatpak/cellar-launcher.sh b/flatpak/cellar-launcher.sh
new file mode 100644
index 0000000..ae2e65a
--- /dev/null
+++ b/flatpak/cellar-launcher.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+set -eu
+export PYTHONPATH="/app/share/cellar${PYTHONPATH:+:$PYTHONPATH}"
+exec python3 /app/share/cellar/cellar-gtk.py "$@"
diff --git a/flatpak/net.enne2.Cellar.desktop b/flatpak/net.enne2.Cellar.desktop
new file mode 100644
index 0000000..1589be2
--- /dev/null
+++ b/flatpak/net.enne2.Cellar.desktop
@@ -0,0 +1,11 @@
+[Desktop Entry]
+Type=Application
+Name=Cellar
+Comment=Browse and restore Bottle archives from a Cellar server
+Exec=cellar
+Icon=net.enne2.Cellar
+Terminal=false
+Categories=Utility;Archiving;GTK;
+Keywords=bottles;backup;archive;restore;wine;
+StartupNotify=true
+StartupWMClass=net.enne2.Cellar
diff --git a/flatpak/net.enne2.Cellar.metainfo.xml b/flatpak/net.enne2.Cellar.metainfo.xml
new file mode 100644
index 0000000..ac38aa0
--- /dev/null
+++ b/flatpak/net.enne2.Cellar.metainfo.xml
@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<component type="desktop-application">
+  <id>net.enne2.Cellar</id>
+  <name>Cellar</name>
+  <summary>Browse and restore Bottle archives from a self-hosted server</summary>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>LicenseRef-proprietary</project_license>
+  <developer id="net.enne2">
+    <name>Matteo Benedetto</name>
+  </developer>
+  <launchable type="desktop-id">net.enne2.Cellar.desktop</launchable>
+  <url type="homepage">https://git.enne2.net/enne2/cellar</url>
+  <url type="bugtracker">https://git.enne2.net/enne2/cellar/issues</url>
+  <provides>
+    <binary>cellar</binary>
+  </provides>
+  <description>
+    <p>Cellar is a small GTK application for browsing and restoring archives stored on a self-hosted Bottle archive server.</p>
+    <p>It can refresh the remote catalog, search archives locally, and reinstall archived Bottles environments with progress feedback.</p>
+  </description>
+  <categories>
+    <category>Utility</category>
+    <category>Archiving</category>
+  </categories>
+  <screenshots>
+    <screenshot type="default">
+      <caption>Cellar application artwork</caption>
+      <image type="source" width="1024" height="1024">https://git.enne2.net/enne2/cellar/raw/branch/master/cellar.jpg</image>
+    </screenshot>
+  </screenshots>
+  <branding>
+    <color type="primary" scheme_preference="light">#5b0f11</color>
+    <color type="primary" scheme_preference="dark">#d8b27d</color>
+  </branding>
+  <content_rating type="oars-1.1" />
+  <releases>
+    <release version="1.0.0" date="2026-03-08" />
+  </releases>
+</component>
diff --git a/flatpak/net.enne2.Cellar.png b/flatpak/net.enne2.Cellar.png
new file mode 100644
index 0000000..a8b38d0
Binary files /dev/null and b/flatpak/net.enne2.Cellar.png differ
diff --git a/net.enne2.Cellar.yaml b/net.enne2.Cellar.yaml
new file mode 100644
index 0000000..3bdbee3
--- /dev/null
+++ b/net.enne2.Cellar.yaml
@@ -0,0 +1,27 @@
+app-id: net.enne2.Cellar
+branch: stable
+runtime: org.gnome.Platform
+runtime-version: '47'
+sdk: org.gnome.Sdk
+command: cellar
+finish-args:
+  - --share=ipc
+  - --share=network
+  - --socket=wayland
+  - --socket=fallback-x11
+  - --device=dri
+  - --filesystem=home
+modules:
+  - name: cellar
+    buildsystem: simple
+    build-commands:
+      - install -Dm755 flatpak/cellar-launcher.sh /app/bin/cellar
+      - install -Dm644 cellar-gtk.py /app/share/cellar/cellar-gtk.py
+      - install -Dm644 client.py /app/share/cellar/client.py
+      - install -Dm644 cellar.jpg /app/share/cellar/cellar.jpg
+      - install -Dm644 flatpak/net.enne2.Cellar.desktop /app/share/applications/net.enne2.Cellar.desktop
+      - install -Dm644 flatpak/net.enne2.Cellar.metainfo.xml /app/share/metainfo/net.enne2.Cellar.metainfo.xml
+      - install -Dm644 flatpak/net.enne2.Cellar.png /app/share/icons/hicolor/512x512/apps/net.enne2.Cellar.png
+    sources:
+      - type: dir
+        path: .
diff --git a/scripts/build-flatpak-repo.sh b/scripts/build-flatpak-repo.sh
new file mode 100755
index 0000000..9be9c76
--- /dev/null
+++ b/scripts/build-flatpak-repo.sh
@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+APP_ID="net.enne2.Cellar"
+BRANCH="stable"
+MANIFEST="${ROOT_DIR}/net.enne2.Cellar.yaml"
+BUILD_DIR="${ROOT_DIR}/flatpak-build"
+REPO_DIR="${ROOT_DIR}/flatpak-repo"
+BUNDLE_PATH="${ROOT_DIR}/dist/${APP_ID}.flatpak"
+
+if ! command -v flatpak-builder >/dev/null 2>&1; then
+    echo "flatpak-builder not found. Install it first." >&2
+    exit 1
+fi
+
+if ! command -v flatpak >/dev/null 2>&1; then
+    echo "flatpak not found. Install it first." >&2
+    exit 1
+fi
+
+mkdir -p "${ROOT_DIR}/dist"
+rm -rf "${BUILD_DIR}"
+mkdir -p "${REPO_DIR}"
+
+flatpak-builder \
+    --force-clean \
+    --repo="${REPO_DIR}" \
+    "${BUILD_DIR}" \
+    "${MANIFEST}"
+
+flatpak build-bundle "${REPO_DIR}" "${BUNDLE_PATH}" "${APP_ID}" "${BRANCH}"
+
+cat <<EOF
+
+Flatpak repository ready:
+  ${REPO_DIR}
+
+Flatpak bundle ready:
+  ${BUNDLE_PATH}
+
+Example private remote setup:
+  flatpak remote-add --if-not-exists --user --no-gpg-verify brain-local http://brain.local/flatpak/cellar
+  flatpak install --user brain-local ${APP_ID}
+EOF
diff --git a/scripts/publish-flatpak-repo.sh b/scripts/publish-flatpak-repo.sh
new file mode 100755
index 0000000..c2a664a
--- /dev/null
+++ b/scripts/publish-flatpak-repo.sh
@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [[ $# -lt 2 || $# -gt 3 ]]; then
+    echo "Usage: $0 <host> <remote-path> [public-url]" >&2
+    exit 1
+fi
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+REPO_DIR="${ROOT_DIR}/flatpak-repo"
+HOST="$1"
+REMOTE_PATH="$2"
+PUBLIC_URL="${3:-}"
+
+if [[ ! -d "${REPO_DIR}" ]]; then
+    echo "Repository not found at ${REPO_DIR}. Run ./scripts/build-flatpak-repo.sh first." >&2
+    exit 1
+fi
+
+if ! command -v rsync >/dev/null 2>&1; then
+    echo "rsync not found. Install it first." >&2
+    exit 1
+fi
+
+rsync -av --delete "${REPO_DIR}/" "${HOST}:${REMOTE_PATH%/}/"
+
+if [[ -n "${PUBLIC_URL}" ]]; then
+    cat <<EOF
+
+Published to ${HOST}:${REMOTE_PATH}
+
+Clients can add the remote with:
+  flatpak remote-add --if-not-exists --user --no-gpg-verify brain-local ${PUBLIC_URL}
+EOF
+else
+    echo
+    echo "Published to ${HOST}:${REMOTE_PATH}"
+fi