diff --git a/alembic/versions/0fec09fb6ae6_manufacturers_url_nullable.py b/alembic/versions/0fec09fb6ae6_manufacturers_url_nullable.py
new file mode 100644
index 0000000..4989e18
--- /dev/null
+++ b/alembic/versions/0fec09fb6ae6_manufacturers_url_nullable.py
@@ -0,0 +1,37 @@
+"""manufacturers_url_nullable
+
+Revision ID: 0fec09fb6ae6
+Revises: 9a1c2f6e0b3d
+Create Date: 2026-09-04 23:05:18.990806
+"""
+
+from collections.abc import Sequence
+
+import sqlalchemy as sa
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "0fec09fb6ae6"
+down_revision: str | None = "9a1c2f6e0b3d"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    with op.batch_alter_table("manufacturers", schema=None) as batch_op:
+        batch_op.alter_column(
+            "url",
+            existing_type=sa.String(),
+            nullable=True,
+        )
+
+
+def downgrade() -> None:
+    op.execute("UPDATE manufacturers SET url = '' WHERE url IS NULL")
+    with op.batch_alter_table("manufacturers", schema=None) as batch_op:
+        batch_op.alter_column(
+            "url",
+            existing_type=sa.String(),
+            nullable=False,
+        )
diff --git a/app/crud/manufacturer.py b/app/crud/manufacturer.py
index 118b382..a87b2e9 100644
--- a/app/crud/manufacturer.py
+++ b/app/crud/manufacturer.py
@@ -26,7 +26,7 @@ async def create(
     db: AsyncSession,
     *,
     name: str,
-    url: str,
+    url: str | None = None,
     logo_url: str | None = None,
 ) -> Manufacturer:
     m = Manufacturer(name=name, url=url, logo_url=logo_url)
diff --git a/app/models/manufacturer.py b/app/models/manufacturer.py
index 23f29eb..0637435 100644
--- a/app/models/manufacturer.py
+++ b/app/models/manufacturer.py
@@ -8,5 +8,5 @@ class Manufacturer(Base):
 
     id: Mapped[int] = mapped_column(primary_key=True)
     name: Mapped[str] = mapped_column(nullable=False)
-    url: Mapped[str] = mapped_column(nullable=True)
+    url: Mapped[str | None] = mapped_column(nullable=True)
     logo_url: Mapped[str | None] = mapped_column(nullable=True, default=None)
diff --git a/app/schemas/manufacturer.py b/app/schemas/manufacturer.py
index 6ec84a8..e820e18 100644
--- a/app/schemas/manufacturer.py
+++ b/app/schemas/manufacturer.py
@@ -1,4 +1,10 @@
-from pydantic import BaseModel, ConfigDict, HttpUrl
+from pydantic import BaseModel, ConfigDict, HttpUrl, field_validator
+
+
+def _blank_to_none(value: str | None) -> str | None:
+    if isinstance(value, str) and not value.strip():
+        return None
+    return value
 
 
 class ManufacturerBase(BaseModel):
@@ -6,6 +12,10 @@ class ManufacturerBase(BaseModel):
     url: HttpUrl | None = None
     logo_url: HttpUrl | None = None
 
+    _normalize_url = field_validator("url", "logo_url", mode="before")(
+        _blank_to_none
+    )
+
 
 class ManufacturerCreate(ManufacturerBase):
     pass
@@ -16,6 +26,10 @@ class ManufacturerUpdate(BaseModel):
     url: HttpUrl | None = None
     logo_url: HttpUrl | None = None
 
+    _normalize_url = field_validator("url", "logo_url", mode="before")(
+        _blank_to_none
+    )
+
 
 class ManufacturerRead(ManufacturerBase):
     model_config = ConfigDict(from_attributes=True)
diff --git a/app/web/admin.py b/app/web/admin.py
index fc082b0..3750a10 100644
--- a/app/web/admin.py
+++ b/app/web/admin.py
@@ -728,7 +728,7 @@ async def create_manufacturer(
     created = await manufacturer_crud.create(
         db,
         name=name,
-        url=url,
+        url=url.strip() or None,
         logo_url=logo_url.strip() or None,
     )
     await audit_crud.log(
@@ -789,7 +789,11 @@ async def update_manufacturer(
     m = await manufacturer_crud.get(db, manufacturer_id)
     if m is None:
         raise HTTPException(status_code=404, detail="Manufacturer not found")
-    changes = {"name": name, "url": url, "logo_url": logo_url.strip() or None}
+    changes = {
+        "name": name,
+        "url": url.strip() or None,
+        "logo_url": logo_url.strip() or None,
+    }
     await manufacturer_crud.update(db, m, changes)
     await audit_crud.log(
         db,