diff --git a/convert-service/Dockerfile b/convert-service/Dockerfile
new file mode 100644
index 0000000..7024fd7
--- /dev/null
+++ b/convert-service/Dockerfile
@@ -0,0 +1,14 @@
+FROM python:3.12
+
+RUN apt-get update && apt-get install -y --no-install-recommends libreoffice && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY app.py .
+
+EXPOSE 5000
+
+CMD ["python3", "app.py"]
diff --git a/convert-service/app.py b/convert-service/app.py
new file mode 100644
index 0000000..62a2209
--- /dev/null
+++ b/convert-service/app.py
@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+"""LibreOffice converter — Flask HTTP service. POST .doc → .docx."""
+import subprocess, tempfile, os
+from flask import Flask, request, send_file
+
+app = Flask(__name__)
+
+@app.route("/convert", methods=["POST"])
+def convert():
+    if "file" not in request.files:
+        return {"ok": False, "error": "no file"}, 400
+
+    f = request.files["file"]
+    with tempfile.NamedTemporaryFile(suffix=".doc", delete=False) as tmp:
+        f.save(tmp)
+        doc_path = tmp.name
+
+    tmpdir = tempfile.mkdtemp()
+    try:
+        subprocess.run(
+            ["libreoffice", "--headless", "--convert-to", "docx", "--outdir", tmpdir, doc_path],
+            timeout=120, capture_output=True, check=True
+        )
+        docx_files = [x for x in os.listdir(tmpdir) if x.endswith(".docx")]
+        if not docx_files:
+            return {"ok": False, "error": "conversion produced no .docx"}, 500
+        return send_file(os.path.join(tmpdir, docx_files[0]),
+                         mimetype="application/vnd.openxmlformats-officedocument.wordprocessingml.document",
+                         as_attachment=True,
+                         download_name=os.path.splitext(f.filename)[0] + ".docx")
+    except subprocess.TimeoutExpired:
+        return {"ok": False, "error": "conversion timeout"}, 500
+    except subprocess.CalledProcessError as e:
+        return {"ok": False, "error": f"libreoffice: {e.stderr.decode() if e.stderr else 'unknown'}"}, 500
+    finally:
+        if os.path.exists(doc_path):
+            os.unlink(doc_path)
+        for x in os.listdir(tmpdir):
+            os.unlink(os.path.join(tmpdir, x))
+        os.rmdir(tmpdir)
+
+@app.route("/health", methods=["GET"])
+def health():
+    return {"ok": True}
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", port=5000)
diff --git a/convert-service/requirements.txt b/convert-service/requirements.txt
new file mode 100644
index 0000000..7e10602
--- /dev/null
+++ b/convert-service/requirements.txt
@@ -0,0 +1 @@
+flask