diff --git a/copanier/__init__.py b/copanier/__init__.py
index a40c513..a19d8f8 100644
--- a/copanier/__init__.py
+++ b/copanier/__init__.py
@@ -8,7 +8,7 @@ from jinja2 import Environment, PackageLoader, select_autoescape
 from roll import Roll, Response, HttpError
 from roll.extensions import cors, options, traceback, simple_server, static
 
-from . import config, reports, session, utils, emails, loggers
+from . import config, reports, session, utils, emails, loggers, imports
 from .models import Delivery, Order, Person, Product, ProductOrder
 
 
@@ -177,14 +177,28 @@ async def create_delivery(request, response):
 async def import_products(request, response, id):
     delivery = Delivery.load(id)
     delivery.products = []
-    reader = csv.DictReader(
-        request.files.get("data").read().decode().splitlines(), delimiter=";"
-    )
-    for row in reader:
-        delivery.products.append(Product(**row))
-    delivery.persist()
+    data = request.files.get("data")
+    path = f"/livraison/{delivery.id}"
+    if data.filename.endswith(".csv"):
+        try:
+            imports.products_from_csv(delivery, data.read().decode())
+        except ValueError as err:
+            response.message(err, status="error")
+            response.redirect = path
+            return
+    elif data.filename.endswith('.xlsx'):
+        try:
+            imports.products_from_xlsx(delivery, data)
+        except ValueError as err:
+            response.message(err, status="error")
+            response.redirect = path
+            return
+    else:
+        response.message("Format de fichier inconnu", status="error")
+        response.redirect = path
+        return
     response.message("Les produits de la livraison ont bien été mis à jour!")
-    response.redirect = f"/livraison/{delivery.id}"
+    response.redirect = path
 
 
 @app.route("/livraison/{id}/exporter/produits", methods=["GET"])
diff --git a/copanier/imports.py b/copanier/imports.py
new file mode 100644
index 0000000..752ffce
--- /dev/null
+++ b/copanier/imports.py
@@ -0,0 +1,38 @@
+import csv
+from zipfile import BadZipFile
+
+from openpyxl import load_workbook, Workbook
+
+from .models import Product
+
+
+PRODUCT_FIELDS = {"ref", "name", "price"}
+
+
+def products_from_xlsx(delivery, data):
+    if not isinstance(data, Workbook):
+        try:
+            data = load_workbook(data)
+        except BadZipFile:
+            raise ValueError("Impossible de lire le fichier")
+    rows = list(data.active.values)
+    if not rows:
+        raise ValueError
+    headers = rows[0]
+    if not set(headers) >= PRODUCT_FIELDS:
+        raise ValueError("Colonnes obligatoires: name, ref, price")
+    delivery.products = []
+    for row in rows[1:]:
+        raw = {k: v for k, v in dict(zip(headers, row)).items() if v}
+        delivery.products.append(Product(**raw))
+    delivery.persist()
+
+
+def products_from_csv(delivery, data):
+    reader = csv.DictReader(data.splitlines(), delimiter=";")
+    if not set(reader.fieldnames) >= PRODUCT_FIELDS:
+        raise ValueError("Colonnes obligatoires: name, ref, price")
+    delivery.products = []
+    for row in reader:
+        delivery.products.append(Product(**row))
+    delivery.persist()
diff --git a/copanier/templates/edit_delivery.html b/copanier/templates/edit_delivery.html
index da207c2..78638ef 100644
--- a/copanier/templates/edit_delivery.html
+++ b/copanier/templates/edit_delivery.html
@@ -40,7 +40,7 @@
 <h3>Importer des produits (CSV)</h3>
 <p>Colonnes: ref*, name*, price*, description</p>
 <form action="/livraison/{{ delivery.id }}/importer/produits" method="post" enctype="multipart/form-data">
-    <input type="file" name="data">
+    <input type="file" name="data" required>
     <input type="submit" name="Importer des produits">
 </form>
 {% endif %}
diff --git a/tests/test_imports.py b/tests/test_imports.py
new file mode 100644
index 0000000..8942db8
--- /dev/null
+++ b/tests/test_imports.py
@@ -0,0 +1,81 @@
+from io import BytesIO
+
+import pytest
+from openpyxl import Workbook
+
+from copanier import imports
+from copanier.models import Product, Delivery
+
+
+@pytest.fixture
+def workbook():
+    def _(rows, headers=["ref", "name", "price"]):
+        wb = Workbook()
+        ws = wb.active
+        ws.append(headers)
+        for row in rows:
+            ws.append(row)
+        return wb
+
+    return _
+
+
+def test_mandatory_headers_with_xlsx(delivery, workbook):
+    with pytest.raises(ValueError):
+        imports.products_from_xlsx(
+            delivery,
+            workbook([("123", "Chocolat", "2.3")], headers=["ref", "nom", "prix"]),
+        )
+
+
+def test_bad_xlsx_file(delivery, workbook):
+    with pytest.raises(ValueError):
+        imports.products_from_xlsx(delivery, BytesIO(b"pouet"))
+
+
+def test_simple_xlsx_import(delivery, workbook):
+    delivery.persist()
+    assert delivery.products == [Product(ref="123", name="Lait", price=1.5)]
+    imports.products_from_xlsx(delivery, workbook([("123", "Lait cru", 1.3)]))
+    assert Delivery.load(delivery.id).products == [
+        Product(ref="123", name="Lait cru", price=1.3)
+    ]
+
+
+def test_simple_xlsx_import_invalid_price(delivery, workbook):
+    delivery.persist()
+    assert delivery.products == [Product(ref="123", name="Lait", price=1.5)]
+    with pytest.raises(ValueError):
+        imports.products_from_xlsx(delivery, workbook([("123", "Lait cru", "invalid")]))
+    assert Delivery.load(delivery.id).products == [
+        Product(ref="123", name="Lait", price=1.5)
+    ]
+
+
+def test_mandatory_headers_with_csv(delivery):
+    with pytest.raises(ValueError):
+        imports.products_from_csv(delivery, "ref;nom;prix\n123;Chocolat;2.3")
+
+
+def test_bad_csv_file(delivery):
+    with pytest.raises(ValueError):
+        imports.products_from_csv(delivery, "pouet")
+
+
+def test_simple_csv_import(delivery):
+    delivery.persist()
+    assert delivery.products == [Product(ref="123", name="Lait", price=1.5)]
+    imports.products_from_csv(delivery, "ref;name;price\n123;Lait cru;1.3")
+    assert Delivery.load(delivery.id).products == [
+        Product(ref="123", name="Lait cru", price=1.3)
+    ]
+
+
+def test_simple_csv_import_invalid_price(delivery):
+    delivery.persist()
+    assert delivery.products == [Product(ref="123", name="Lait", price=1.5)]
+    with pytest.raises(ValueError):
+        imports.products_from_csv(delivery, "ref;name;price\n123;Lait cru;invalid")
+    assert Delivery.load(delivery.id).products == [
+        Product(ref="123", name="Lait", price=1.5)
+    ]