diff --git a/uploader/app/crossmatch/submit.py b/uploader/app/crossmatch/submit.py
new file mode 100644
index 0000000..cca4a5c
--- /dev/null
+++ b/uploader/app/crossmatch/submit.py
@@ -0,0 +1,89 @@
+from collections.abc import Callable
+
+from psycopg import sql
+
+import uploader.app.report as report
+from uploader.app.storage import PgStorage
+from uploader.app.upload import handle_call
+from uploader.clients.gen.client import adminapi
+from uploader.clients.gen.client.adminapi.api.default import assign_record_pgcs
+from uploader.clients.gen.client.adminapi.models.assign_record_pgcs_request import AssignRecordPgcsRequest
+
+ELIGIBLE_QUERY = sql.SQL("""
+    SELECT r.id
+    FROM layer0.records r
+    JOIN layer0.crossmatch c ON c.record_id = r.id
+    WHERE r.table_id = %s
+      AND r.id > %s
+      AND r.pgc IS NULL
+      AND c.triage_status = 'resolved'
+      AND NOT (c.metadata::jsonb ? 'possible_matches')
+    ORDER BY r.id ASC
+    LIMIT %s
+""")
+
+ELIGIBLE_COUNT_QUERY = """
+    SELECT COUNT(*) AS cnt
+    FROM layer0.records r
+    JOIN layer0.crossmatch c ON c.record_id = r.id
+    WHERE r.table_id = %s
+      AND r.pgc IS NULL
+      AND c.triage_status = 'resolved'
+      AND NOT (c.metadata::jsonb ? 'possible_matches')
+"""
+
+
+def run_submit_crossmatch(
+    storage: PgStorage,
+    table_name: str,
+    batch_size: int,
+    client: adminapi.AuthenticatedClient,
+    report_func: Callable[[report.Event], None],
+    *,
+    write: bool = False,
+) -> None:
+    table_rows = storage.query(
+        "SELECT id FROM layer0.tables WHERE table_name = %s",
+        (table_name,),
+    )
+    if not table_rows:
+        raise RuntimeError(f"Table not found: {table_name}")
+    table_id = table_rows[0]["id"]
+
+    eligible_total = int(storage.query(ELIGIBLE_COUNT_QUERY, (table_id,))[0]["cnt"])
+    report_func(
+        report.LogEvent(
+            message=f"Submitting crossmatch for {table_name}: {eligible_total} eligible records (write={write}).",
+        )
+    )
+
+    submitted = 0
+    last_id = ""
+    while True:
+        rows = storage.query(ELIGIBLE_QUERY, (table_id, last_id, batch_size))
+        if not rows:
+            break
+        record_ids = [r["id"] for r in rows]
+        last_id = record_ids[-1]
+        if write:
+            handle_call(
+                assign_record_pgcs.sync_detailed(
+                    client=client,
+                    body=AssignRecordPgcsRequest(record_ids=record_ids),
+                )
+            )
+        submitted += len(record_ids)
+        report_func(
+            report.LogEvent(
+                message=f"Batch submitted: {len(record_ids)} records ({submitted}/{eligible_total}).",
+            )
+        )
+        progress = 100.0 if eligible_total == 0 else (100.0 * submitted / eligible_total)
+        report_func(report.ProgressEvent(percent=min(progress, 100.0)))
+
+    report_func(report.ProgressEvent(percent=100))
+    report_func(
+        report.DoneEvent(
+            message=f"Submitted {submitted}/{eligible_total} records (write={write}).",
+        )
+    )
diff --git a/uploader/forms/submit_crossmatch.py b/uploader/forms/submit_crossmatch.py
new file mode 100644
index 0000000..38f0dc7
--- /dev/null
+++ b/uploader/forms/submit_crossmatch.py
@@ -0,0 +1,50 @@
+from collections.abc import Callable
+from typing import Literal, cast
+from urllib.parse import quote_plus
+
+from psycopg import connect
+from pydantic import BaseModel, Field
+
+import uploader.app.report as report
+from uploader.app.crossmatch.submit import run_submit_crossmatch
+from uploader.app.endpoints import db_dsn_map, env_map
+from uploader.app.storage import PgStorage
+from uploader.clients.gen.client import adminapi
+from uploader.credentials import load_credentials, load_token
+
+
+class SubmitCrossmatchForm(BaseModel):
+    endpoint: Literal["dev", "test", "prod"] = Field(default="prod", title="API endpoint")
+    table_name: str = Field(..., title="Table name")
+    batch_size: int = Field(default=1000, title="Batch size", ge=1, le=10000)
+    write: bool = Field(
+        default=False,
+        title="Write to API",
+        description="If disabled, only counts records that would be submitted.",
+    )
+
+
+def handle_submit_crossmatch(
+    form: BaseModel,
+    report_func: Callable[[report.Event], None],
+) -> None:
+    f = cast(SubmitCrossmatchForm, form)
+    db_user, db_password = load_credentials()
+    dsn = db_dsn_map[f.endpoint].format(
+        user=quote_plus(db_user),
+        password=quote_plus(db_password),
+    )
+    client = adminapi.AuthenticatedClient(
+        base_url=env_map[f.endpoint],
+        token=load_token(),
+    )
+    with connect(dsn) as conn:
+        storage = PgStorage(conn)
+        run_submit_crossmatch(
+            storage,
+            f.table_name.strip(),
+            f.batch_size,
+            client,
+            report_func=report_func,
+            write=f.write,
+        )
diff --git a/uploader/task_registry.py b/uploader/task_registry.py
index 41defc3..fc6670a 100644
--- a/uploader/task_registry.py
+++ b/uploader/task_registry.py
@@ -17,6 +17,7 @@
     handle_structured_photometry_hyperleda,
 )
 from uploader.forms.structured_redshift import StructuredRedshiftForm, handle_structured_redshift
+from uploader.forms.submit_crossmatch import SubmitCrossmatchForm, handle_submit_crossmatch
 from uploader.forms.upload_csv import UploadCsvForm, handle_upload_csv
 from uploader.forms.upload_fits import UploadFitsForm, handle_upload_fits
 from uploader.forms.upload_vizier import UploadVizierForm, handle_upload_vizier
@@ -148,3 +149,15 @@ def register_all_tasks() -> None:
             group="Crossmatch",
         ),
     )
+    register_task(
+        TaskDefinition(
+            id="submit-crossmatch",
+            title="Submit crossmatch",
+            description=(
+                "Submit resolved crossmatch results to the backend, assigning PGCs and promoting records to layer 2."
+            ),
+            form_model=SubmitCrossmatchForm,
+            handler=handle_submit_crossmatch,
+            group="Crossmatch",
+        ),
+    )