diff --git a/Makefile b/Makefile
index 92bf406..b4301cd 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 PYTHON ?= python3
 NPM ?= npm
 PHP ?= php
-PY_FILES := kassa.py $(shell find plugins tests -type f -name '*.py' | sort)
+PY_FILES := kassa.py load_printer_logo.py $(shell find plugins tests -type f -name '*.py' | sort)
 PHP_FILES := $(shell find www -type f -name '*.php' | sort)
 
 .PHONY: test python-test js-test php-test venv pip-compile pip-sync pip-sync-dev lint python-lint js-lint php-lint check-types fix check
@@ -42,7 +42,7 @@ pip-sync-dev: ## synchronizes the .venv with the state of requirements.txt
 lint: python-lint js-lint php-lint  ## Do basic linting
 
 python-lint: venv
-	@. .venv/bin/activate && ${env} ${PYTHON} -m pylint --persistent=no kassa.py plugins
+	@. .venv/bin/activate && ${env} ${PYTHON} -m pylint --persistent=no kassa.py load_printer_logo.py plugins
 	@. .venv/bin/activate; for file in ${PY_FILES}; do ${env} ${PYTHON} -m black --check --quiet --workers 1 "$$file" || exit $$?; done
 
 node_modules/.package-lock.json: package.json package-lock.json
diff --git a/README.md b/README.md
index fcb17aa..8636feb 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,35 @@ remain supported. The adapter has no unique serial number, so this rule assumes
 only one `067b:2303` adapter is connected. With several identical adapters, narrow
 the rule to the appropriate USB port before installing it.
 
+### Store the receipt logo in the Epson
+
+Receipts use NV logo 1 already stored in the printer (`FS p 1 3`, the existing
+`LOGO` constant). Upload a replacement once with:
+
+```sh
+# Stop the kassa backend before uploading.
+.venv/bin/python load_printer_logo.py images/hack42.png --write --test-print
+```
+
+The script reads `pos.serial` from `config.yaml` (default `/dev/ttyKASSA`,
+19200 baud). Use `--config`, `--port`, or `--baudrate` to override it. Without
+`--write` it only prepares the image; `--output logo.bin` exports the `FS q`
+command for offline inspection. `--test-print` prints the stored logo after
+uploading. Restart the backend afterwards.
+
+The default stored width is 192 dots; `LOGO` prints at twice the stored width
+and height, so the printed width is at most 384 dots. `--width` changes the
+stored width. Images retain their aspect ratio; transparent pixels and padding
+become white. Stored logos persist after power-off; receipt generation does not
+upload the image again.
+
+Epson's [FS q command](https://download4.epson.biz/sec_pubs/pos/reference_en/escpos/fs_lq.html)
+replaces **all** existing NV logos/graphics and resets the printer. Run the
+script only when changing the logo, with the backend stopped, and keep the
+printer powered on until it finishes. A successful serial write cannot confirm
+that the printer accepted the logo; verify the test print. The printer must
+support the same legacy NV commands already used for the receipt header.
+
 ### data
 
 Data is stored in 'data'. In production it is also committed to git, but for
diff --git a/load_printer_logo.py b/load_printer_logo.py
new file mode 100644
index 0000000..7c4154d
--- /dev/null
+++ b/load_printer_logo.py
@@ -0,0 +1,103 @@
+"""Upload NV logo 1 for the existing Epson FS p receipt header."""
+
+import argparse
+from pathlib import Path
+import struct
+import time
+
+from PIL import Image, ImageOps
+import serial
+
+from config import load_config
+from plugins.POS import CENTER, CUT, FEED, LOGO, PRINTER
+
+
+def encode_logo(path, width=192):
+    """Encode FS q column data; LOGO prints this at twice the stored size."""
+    if not 8 <= width <= 512:
+        raise ValueError("Stored width must be between 8 and 512 dots")
+    with Image.open(path) as source:
+        image = source.convert("RGBA")
+    image.thumbnail((width, 512), Image.Resampling.LANCZOS)
+    white = Image.new("RGBA", image.size, "white")
+    gray = Image.alpha_composite(white, image).convert("L")
+    ink = ImageOps.invert(gray.point(lambda value: 255 if value >= 128 else 0))
+    x_bytes, y_bytes = (image.width + 7) // 8, (image.height + 7) // 8
+    padded = Image.new("1", (x_bytes * 8, y_bytes * 8), 0)
+    padded.paste(ink.convert("1"), (0, 0))
+    # FS q packs each column from top to bottom, most significant bit first.
+    columns = padded.transpose(Image.Transpose.TRANSPOSE).tobytes()
+    return b"\x1cq\x01" + struct.pack("<HH", x_bytes, y_bytes) + columns
+
+
+def upload_logo(port, baudrate, payload, test_print=False):
+    """Write once, then allow the printer to finish its NV write/reset."""
+    with serial.Serial(
+        port=port, baudrate=baudrate, timeout=5, write_timeout=10, exclusive=True
+    ) as printer:
+        data = PRINTER + payload
+        for offset in range(0, len(data), 32):
+            chunk = data[offset : offset + 32]
+            if printer.write(chunk) != len(chunk):
+                raise OSError("Incomplete serial write; logo upload interrupted")
+            time.sleep(0.05)
+        printer.flush()
+        time.sleep(5)
+        if test_print:
+            proof = PRINTER + CENTER + LOGO + FEED + CUT
+            if printer.write(proof) != len(proof):
+                raise OSError("Incomplete serial write during test print")
+            printer.flush()
+
+
+def main(argv=None):
+    parser = argparse.ArgumentParser(
+        description="Store Epson NV logo 1. Replaces ALL existing NV logos. "
+        "Stop the kassa backend first and keep the printer powered on."
+    )
+    parser.add_argument(
+        "image",
+        nargs="?",
+        type=Path,
+        default=Path(__file__).resolve().parent / "images/hack42.png",
+    )
+    parser.add_argument(
+        "--width",
+        type=int,
+        default=192,
+        help="stored width in dots; receipts print at 2x (default: 192)",
+    )
+    parser.add_argument("--config", type=Path, help="config.yaml override")
+    parser.add_argument("--port", help="override pos.serial.port")
+    parser.add_argument("--baudrate", type=int, help="override pos.serial.baudrate")
+    parser.add_argument("--output", type=Path, help="export FS q bytes to a file")
+    parser.add_argument("--write", action="store_true", help="replace printer NV logos")
+    parser.add_argument(
+        "--test-print", action="store_true", help="print logo after upload"
+    )
+    args = parser.parse_args(argv)
+    if args.test_print and not args.write:
+        parser.error("--test-print requires --write")
+    try:
+        payload = encode_logo(args.image, args.width)
+        if args.output:
+            args.output.write_bytes(payload)
+        if args.write:
+            settings = load_config(args.config)["pos"]["serial"]
+            upload_logo(
+                args.port or settings["port"],
+                args.baudrate or int(settings["baudrate"]),
+                payload,
+                args.test_print,
+            )
+            print("NV logo 1 sent to printer; verify with a test print.")
+        else:
+            print(
+                f"Prepared {len(payload)} bytes. Use --write to replace printer NV logos."
+            )
+    except (OSError, ValueError, serial.SerialException) as exc:
+        parser.exit(1, f"Logo upload failed: {exc}\n")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/tests/test_load_printer_logo.py b/tests/test_load_printer_logo.py
new file mode 100644
index 0000000..b6a3974
--- /dev/null
+++ b/tests/test_load_printer_logo.py
@@ -0,0 +1,116 @@
+from pathlib import Path
+import runpy
+import struct
+from unittest.mock import Mock, patch
+
+from PIL import Image
+import pytest
+
+import load_printer_logo as loader
+from plugins.POS import CENTER, CUT, FEED, LOGO, PRINTER
+
+
+def test_column_encoding_transparency_and_padding(tmp_path):
+    path = tmp_path / "logo.png"
+    image = Image.new("RGBA", (9, 9), (0, 0, 0, 0))
+    image.putpixel((0, 0), (0, 0, 0, 255))
+    image.putpixel((8, 8), (0, 0, 0, 255))
+    image.save(path)
+
+    payload = loader.encode_logo(path)
+
+    expected = bytearray(32)
+    expected[0] = 0x80
+    expected[17] = 0x80
+    assert payload == b"\x1cq\x01" + struct.pack("<HH", 2, 2) + expected
+
+
+def test_logo_scales_proportionally(tmp_path):
+    path = tmp_path / "logo.png"
+    Image.new("RGB", (32, 16), "black").save(path)
+    assert loader.encode_logo(path, 16) == (
+        b"\x1cq\x01" + struct.pack("<HH", 2, 1) + b"\xff" * 16
+    )
+
+
+@pytest.mark.parametrize("width", [0, 513])
+def test_invalid_width_does_not_load_or_upload(width):
+    with pytest.raises(ValueError):
+        loader.encode_logo("missing.png", width)
+
+
+@pytest.mark.parametrize("test_print", [False, True])
+def test_upload_writes_complete_command_and_optional_existing_logo(test_print):
+    printer = Mock()
+    printer.write.side_effect = len
+    payload = b"\x1cq\x01" + bytes(80)
+    with patch.object(loader.serial, "Serial") as serial_mock, patch.object(
+        loader.time, "sleep"
+    ):
+        serial_mock.return_value.__enter__.return_value = printer
+        loader.upload_logo("/dev/test", 19200, payload, test_print)
+
+    serial_mock.assert_called_once_with(
+        port="/dev/test", baudrate=19200, timeout=5, write_timeout=10, exclusive=True
+    )
+    written = b"".join(call.args[0] for call in printer.write.call_args_list)
+    proof = PRINTER + CENTER + LOGO + FEED + CUT if test_print else b""
+    assert written == PRINTER + payload + proof
+    assert printer.flush.call_count == (2 if test_print else 1)
+
+
+@pytest.mark.parametrize("results", [[0], [len(PRINTER) + 1, 0]])
+def test_upload_rejects_short_writes(results):
+    with patch.object(loader.serial, "Serial") as serial_mock, patch.object(
+        loader.time, "sleep"
+    ):
+        serial_mock.return_value.__enter__.return_value.write.side_effect = results
+        with pytest.raises(OSError, match="Incomplete serial write"):
+            loader.upload_logo("/dev/test", 19200, b"x", test_print=True)
+
+
+def test_cli_default_is_offline_and_exports_payload(tmp_path, capsys):
+    output = tmp_path / "logo.bin"
+    with patch.object(loader, "upload_logo") as upload:
+        loader.main(["--output", str(output)])
+    upload.assert_not_called()
+    assert output.read_bytes().startswith(b"\x1cq\x01")
+    assert "Use --write" in capsys.readouterr().out
+
+
+def test_cli_uses_serial_config(tmp_path, capsys):
+    config = tmp_path / "config.yaml"
+    config.write_text(
+        "pos:\n  serial:\n    port: /dev/configured\n    baudrate: 9600\n"
+    )
+    with patch.object(loader, "upload_logo") as upload:
+        loader.main(["--config", str(config), "--write", "--test-print"])
+    assert upload.call_args.args[:2] == ("/dev/configured", 9600)
+    assert upload.call_args.args[3] is True
+    assert "verify with a test print" in capsys.readouterr().out
+
+
+def test_cli_serial_overrides():
+    with patch.object(loader, "upload_logo") as upload:
+        loader.main(["--write", "--port", "/dev/override", "--baudrate", "4800"])
+    assert upload.call_args.args[:2] == ("/dev/override", 4800)
+
+
+def test_cli_print_requires_write():
+    with pytest.raises(SystemExit) as error:
+        loader.main(["--test-print"])
+    assert error.value.code == 2
+
+
+def test_cli_serial_error_has_nonzero_exit(capsys):
+    with patch.object(loader, "upload_logo", side_effect=OSError("port busy")):
+        with pytest.raises(SystemExit) as error:
+            loader.main(["--write"])
+    assert error.value.code == 1
+    assert "port busy" in capsys.readouterr().err
+
+
+def test_cli_entrypoint_is_offline(capsys):
+    with patch("sys.argv", ["load_printer_logo.py"]):
+        runpy.run_path(str(Path(loader.__file__)), run_name="__main__")
+    assert "Use --write" in capsys.readouterr().out