diff --git a/serverscripts/qibocal-index-reports.py b/serverscripts/qibocal-index-reports.py
index a70381902..8f5064080 100644
--- a/serverscripts/qibocal-index-reports.py
+++ b/serverscripts/qibocal-index-reports.py
@@ -6,8 +6,6 @@
 import sys
 from collections import ChainMap
 
-import yaml
-
 ROOT = "/home/users/qibocal/qibocal-reports"
 ROOT_URL = "http://login.qrccluster.com:9000/"
 OUT = "/home/users/qibocal/qibocal-reports/index.json"
@@ -17,36 +15,38 @@
     "platform": "-",
     "start-time": "-",
     "end-time": "-",
+    "tag": "-",
 }
-REQUIRED_FILE_METADATA = {"title", "date", "platform", "start-time" "end-time"}
+REQUIRED_FILE_METADATA = {"title", "date", "platform", "start-time" "end-time", "tag"}
 
 
 def meta_from_path(p):
     meta = ChainMap(DEFAULTS)
-    yaml_meta = p / "meta.yml"
-    yaml_res = {}
-    if yaml_meta.exists():
-        with yaml_meta.open() as f:
+    json_meta = p / "meta.json"
+    json_res = {}
+    if json_meta.exists():
+        with json_meta.open() as f:
             try:
-                yaml_res = yaml.safe_load(f)
-            except yaml.YAMLError as e:
-                print(f"Error processing {yaml_meta}: {e}", file=sys.stderr)
-    meta = meta.new_child(yaml_res)
+                json_res = json.load(f)
+            except json.decoder.JSONDecodeError as e:
+                print(f"Error processing {json_meta}: {e}", file=sys.stderr)
+    meta = meta.new_child(json_res)
     return meta
 
 
 def register(p):
     path_meta = meta_from_path(p)
-    title, date, platform, start_time, end_time = (
+    title, date, platform, start_time, end_time, tag = (
         path_meta["title"],
         path_meta["date"],
         path_meta["platform"],
         path_meta["start-time"],
         path_meta["end-time"],
+        path_meta["tag"],
     )
     url = ROOT_URL + p.name
     titlelink = f'<a href="{url}">{title}</a>'
-    return (titlelink, date, platform, start_time, end_time)
+    return (titlelink, date, platform, start_time, end_time, tag)
 
 
 def make_index():
diff --git a/serverscripts/web/index.html b/serverscripts/web/index.html
index 74df4be72..316835e15 100644
--- a/serverscripts/web/index.html
+++ b/serverscripts/web/index.html
@@ -54,6 +54,7 @@ <h2>Uploaded Reports</h2>
             <th scope="col">Platform</th>
             <th scope="col">Start-time (UTC)</th>
             <th scope="col">End-time (UTC)</th>
+            <th scope="col">Tag</th>
           </tr>
         </thead>
       </table>
diff --git a/src/qibocal/cli/_base.py b/src/qibocal/cli/_base.py
index b692d7be2..49fb67693 100644
--- a/src/qibocal/cli/_base.py
+++ b/src/qibocal/cli/_base.py
@@ -120,11 +120,17 @@ def fit(folder: pathlib.Path, update):
 @click.argument(
     "path", metavar="FOLDER", type=click.Path(exists=True, path_type=pathlib.Path)
 )
-def upload(path):
+@click.option(
+    "--tag",
+    default=None,
+    type=str,
+    help="Optional tag.",
+)
+def upload(path, tag):
     """Uploads output folder to server
 
     Arguments:
 
     - FOLDER: input folder.
     """
-    upload_report(path)
+    upload_report(path, tag)
diff --git a/src/qibocal/cli/upload.py b/src/qibocal/cli/upload.py
index 06bdbe99f..0d53ed6db 100644
--- a/src/qibocal/cli/upload.py
+++ b/src/qibocal/cli/upload.py
@@ -1,5 +1,6 @@
 """Upload report to server."""
 import base64
+import json
 import pathlib
 import shutil
 import socket
@@ -7,8 +8,11 @@
 import uuid
 from urllib.parse import urljoin
 
+import yaml
 from qibo.config import log, raise_error
 
+from .utils import META
+
 # options for report upload
 UPLOAD_HOST = (
     "qibocal@localhost"
@@ -19,7 +23,13 @@
 ROOT_URL = "http://login.qrccluster.com:9000/"
 
 
-def upload_report(path: pathlib.Path):
+def upload_report(path: pathlib.Path, tag: str):
+    # load meta and update tag
+    if tag is not None:
+        meta = yaml.safe_load((path / META).read_text())
+        meta["tag"] = tag
+        (path / META).write_text(json.dumps(meta, indent=4))
+
     # check the rsync command exists.
     if not shutil.which("rsync"):
         raise_error(