diff --git a/code/processes/converting-process/src/main/java/nu/marginalia/converting/ConverterMain.java b/code/processes/converting-process/src/main/java/nu/marginalia/converting/ConverterMain.java
index 7afab7409..99a468930 100644
--- a/code/processes/converting-process/src/main/java/nu/marginalia/converting/ConverterMain.java
+++ b/code/processes/converting-process/src/main/java/nu/marginalia/converting/ConverterMain.java
@@ -7,6 +7,7 @@
 import nu.marginalia.converting.model.ProcessedDomain;
 import nu.marginalia.converting.sideload.SideloadSource;
 import nu.marginalia.converting.sideload.SideloadSourceFactory;
+import nu.marginalia.converting.writer.ConverterBatchWriter;
 import nu.marginalia.converting.writer.ConverterWriter;
 import nu.marginalia.db.storage.FileStorageService;
 import nu.marginalia.mq.MessageQueueFactory;
@@ -25,6 +26,7 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.IOException;
 import java.nio.file.Path;
 import java.sql.SQLException;
 import java.util.Optional;
@@ -82,10 +84,10 @@ public ConverterMain(
         heartbeat.start();
     }
 
-    public void convert(SideloadSource sideloadSource, Path writeDir) throws Exception {
-        int maxPoolSize = 16;
-
-        // FIXME
+    public void convert(SideloadSource sideloadSource, Path writeDir) throws IOException {
+        try (var writer = new ConverterBatchWriter(writeDir, 0)) {
+            writer.write(sideloadSource);
+        }
     }
 
     public void convert(CrawlPlan plan) throws Exception {
diff --git a/code/processes/converting-process/src/main/java/nu/marginalia/converting/writer/ConverterBatchWriter.java b/code/processes/converting-process/src/main/java/nu/marginalia/converting/writer/ConverterBatchWriter.java
index cea46f20a..cc9f04678 100644
--- a/code/processes/converting-process/src/main/java/nu/marginalia/converting/writer/ConverterBatchWriter.java
+++ b/code/processes/converting-process/src/main/java/nu/marginalia/converting/writer/ConverterBatchWriter.java
@@ -2,7 +2,9 @@
 
 import gnu.trove.list.TLongList;
 import gnu.trove.list.array.TLongArrayList;
+import nu.marginalia.converting.model.ProcessedDocument;
 import nu.marginalia.converting.model.ProcessedDomain;
+import nu.marginalia.converting.sideload.SideloadSource;
 import nu.marginalia.io.processed.DocumentRecordParquetFileWriter;
 import nu.marginalia.io.processed.DomainLinkRecordParquetFileWriter;
 import nu.marginalia.io.processed.DomainRecordParquetFileWriter;
@@ -24,14 +26,15 @@
 import java.util.concurrent.ForkJoinPool;
 import java.util.concurrent.Future;
 
-public class ConverterBatchWriter {
+/** Writer for a single batch of converter parquet files */
+public class ConverterBatchWriter implements AutoCloseable {
     private final DomainRecordParquetFileWriter domainWriter;
     private final DomainLinkRecordParquetFileWriter domainLinkWriter;
     private final DocumentRecordParquetFileWriter documentWriter;
 
     private static final Logger logger = LoggerFactory.getLogger(ConverterBatchWriter.class);
 
-    ConverterBatchWriter(Path basePath, int batchNumber) throws IOException {
+    public ConverterBatchWriter(Path basePath, int batchNumber) throws IOException {
         domainWriter = new DomainRecordParquetFileWriter(
                 ProcessedDataFileNames.domainFileName(basePath, batchNumber)
         );
@@ -43,6 +46,14 @@ public class ConverterBatchWriter {
         );
     }
 
+    public void write(SideloadSource sideloadSource) throws IOException {
+        var domain = sideloadSource.getDomain();
+
+        writeDomainData(domain);
+
+        writeDocumentData(domain.domain, sideloadSource.getDocumentsStream());
+    }
+
     public void write(ProcessedDomain domain) {
         var results = ForkJoinPool.commonPool().invokeAll(
                 writeTasks(domain)
@@ -67,10 +78,22 @@ private Object writeDocumentData(ProcessedDomain domain) throws IOException {
         if (domain.documents == null)
             return this;
 
-        String domainName = domain.domain.toString();
+        writeDocumentData(domain.domain, domain.documents.iterator());
+
+        return this;
+    }
+
+    private void writeDocumentData(EdgeDomain domain,
+                                     Iterator<ProcessedDocument> documentIterator)
+            throws IOException
+    {
+
         int ordinal = 0;
 
-        for (var document : domain.documents) {
+        String domainName = domain.toString();
+
+        while (documentIterator.hasNext()) {
+            var document = documentIterator.next();
             if (document.details == null) {
                 new DocumentRecord(
                         domainName,
@@ -119,7 +142,6 @@ private Object writeDocumentData(ProcessedDomain domain) throws IOException {
             ordinal++;
         }
 
-        return this;
     }
 
     private Object writeLinkData(ProcessedDomain domain) throws IOException {
diff --git a/code/services-core/control-service/src/main/java/nu/marginalia/control/ControlService.java b/code/services-core/control-service/src/main/java/nu/marginalia/control/ControlService.java
index 43e9d9856..2b6b6d580 100644
--- a/code/services-core/control-service/src/main/java/nu/marginalia/control/ControlService.java
+++ b/code/services-core/control-service/src/main/java/nu/marginalia/control/ControlService.java
@@ -188,6 +188,7 @@ public ControlService(BaseServiceParams params,
         Spark.post("/public/actions/trigger-data-exports", controlActionsService::triggerDataExports, redirectToActors);
         Spark.post("/public/actions/flush-api-caches", controlActionsService::flushApiCaches, redirectToActors);
         Spark.post("/public/actions/truncate-links-database", controlActionsService::truncateLinkDatabase, redirectToActors);
+        Spark.post("/public/actions/sideload-encyclopedia", controlActionsService::sideloadEncyclopedia, redirectToActors);
 
         // Review Random Domains
         Spark.get("/public/review-random-domains", this::reviewRandomDomainsModel, reviewRandomDomainsRenderer::render);
diff --git a/code/services-core/control-service/src/main/java/nu/marginalia/control/svc/ControlActionsService.java b/code/services-core/control-service/src/main/java/nu/marginalia/control/svc/ControlActionsService.java
index a8267d40d..337a05bfd 100644
--- a/code/services-core/control-service/src/main/java/nu/marginalia/control/svc/ControlActionsService.java
+++ b/code/services-core/control-service/src/main/java/nu/marginalia/control/svc/ControlActionsService.java
@@ -4,18 +4,20 @@
 import com.google.inject.Singleton;
 import nu.marginalia.control.actor.ControlActors;
 import nu.marginalia.control.actor.Actor;
+import nu.marginalia.control.actor.task.ConvertActor;
 import nu.marginalia.db.DomainTypes;
 import nu.marginalia.index.client.IndexClient;
 import nu.marginalia.index.client.IndexMqEndpoints;
 import nu.marginalia.mq.MessageQueueFactory;
 import nu.marginalia.mq.outbox.MqOutbox;
-import nu.marginalia.search.client.SearchClient;
 import nu.marginalia.service.control.ServiceEventLog;
 import nu.marginalia.service.id.ServiceId;
 import spark.Request;
 import spark.Response;
 import spark.Spark;
 
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.UUID;
 
 @Singleton
@@ -97,6 +99,22 @@ public Object truncateLinkDatabase(Request request, Response response) throws Ex
         return "";
     }
 
+    public Object sideloadEncyclopedia(Request request, Response response) throws Exception {
+
+        Path sourcePath = Path.of(request.queryParams("source"));
+        if (!Files.exists(sourcePath)) {
+            Spark.halt(404);
+            return "No such file " + sourcePath;
+        }
+
+        eventLog.logEvent("USER-ACTION", "SIDELOAD ENCYCLOPEDIA");
+
+        actors.startFrom(Actor.CONVERT, ConvertActor.CONVERT_ENCYCLOPEDIA, sourcePath.toString());
+
+        return "";
+    }
+
+
     public Object triggerRepartition(Request request, Response response) throws Exception {
         indexClient.outbox().sendAsync(IndexMqEndpoints.INDEX_REPARTITION, "");
 
diff --git a/code/services-core/control-service/src/main/resources/templates/control/actions.hdb b/code/services-core/control-service/src/main/resources/templates/control/actions.hdb
index 9ec528d4a..e97683226 100644
--- a/code/services-core/control-service/src/main/resources/templates/control/actions.hdb
+++ b/code/services-core/control-service/src/main/resources/templates/control/actions.hdb
@@ -24,6 +24,21 @@
                 </form>
             </td>
         </tr>
+        <tr>
+            <td><b>Sideload Encyclopedia</b><p>
+                This will load pre-digested encyclopedia data
+                from a encyclopedia.marginalia.nu-style database.
+            </td>
+            <td>
+                <form method="post" action="/actions/sideload-encyclopedia" onsubmit="return confirm('Confirm sideloading')">
+                    <label for="source">articles.db location on server</label><br>
+                    <input id="source" name="source" value="">
+                    <br><br>
+
+                    <input type="submit" value="Sideload Encyclopedia">
+                </form>
+            </td>
+        </tr>
         <tr>
             <td>
                 <b>Reload Blogs List</b>