diff --git a/bukuserver/static/bukuserver/js/filters_fix.js b/bukuserver/static/bukuserver/js/filters_fix.js
new file mode 100644
index 00000000..b53e3bec
--- /dev/null
+++ b/bukuserver/static/bukuserver/js/filters_fix.js
@@ -0,0 +1,7 @@
+$(document).ready(function () {
+  const IDX = [[36, 'a'], [10, 'A'], [0, '0']];
+  let idxChar = (i, [x, c]=IDX.find(([x]) => i >= x)) => String.fromCharCode(c.charCodeAt(0) + (i-x));
+  filter_form.onsubmit = function () {
+    $(`.filter-val[name]`, this).each((i, e) => {e.name = e.name.replace(/(?<=^flt)[^_]+(?=_)/, idxChar(i))});
+  };
+});
diff --git a/bukuserver/views.py b/bukuserver/views.py
index b0b31cac..76b5d441 100644
--- a/bukuserver/views.py
+++ b/bukuserver/views.py
@@ -180,7 +180,7 @@ def get_detail_value(self, context, model, name):
     edit_template = "bukuserver/bookmark_edit.html"
     named_filter_urls = True
     extra_css = ['/static/bukuserver/css/' + it for it in ('bookmark.css', 'modal.css')]
-    extra_js = ['/static/bukuserver/js/' + it for it in ('page_size.js', 'last_page.js')]
+    extra_js = ['/static/bukuserver/js/' + it for it in ('page_size.js', 'last_page.js', 'filters_fix.js')]
     last_page = expose('/last-page')(last_page)
 
     def __init__(self, bukudb: buku.BukuDb, *args, **kwargs):
@@ -432,7 +432,7 @@ def _name_formatter(self, _, model, name):
     }
     list_template = 'bukuserver/tags_list.html'
     edit_template = "bukuserver/tag_edit.html"
-    extra_js = ['/static/bukuserver/js/' + it for it in ('page_size.js', 'last_page.js')]
+    extra_js = ['/static/bukuserver/js/' + it for it in ('page_size.js', 'last_page.js', 'filters_fix.js')]
     last_page = expose('/last-page')(last_page)
 
     def __init__(self, bukudb, *args, **kwargs):
@@ -620,6 +620,8 @@ def page_of(items, size, idx):
         return []
 
 def filter_key(flt, idx=''):
+    if isinstance(idx, int) and idx > 9:
+        idx = (chr(ord('A') + idx-10) if idx < 36 else chr(ord('a') + idx-36))
     return 'flt' + str(idx) + '_' + BookmarkModelView._filter_arg(flt)
 
 def format_value(field, bookmark, spacing=''):
diff --git a/tests/test_views.py b/tests/test_views.py
index 9e843656..440f538b 100644
--- a/tests/test_views.py
+++ b/tests/test_views.py
@@ -3,6 +3,7 @@
 resources: https://flask.palletsprojects.com/en/2.2.x/testing/
 """
 from argparse import Namespace
+from unittest import mock
 
 import pytest
 from flask import request
@@ -11,7 +12,7 @@
 
 from buku import BukuDb
 from bukuserver import server
-from bukuserver.views import BookmarkModelView, TagModelView
+from bukuserver.views import BookmarkModelView, TagModelView, filter_key
 from tests.util import mock_fetch, _add_rec
 
 
@@ -61,6 +62,12 @@ def bmv_instance(bukudb):
     return BookmarkModelView(bukudb)
 
 
+@pytest.mark.parametrize('idx, char', [('', ''), (0, '0'), (9, '9'), (10, 'A'), (35, 'Z'), (36, 'a'), (61, 'z')])
+def test_filter_key(idx, char):
+    with mock.patch('bukuserver.views.BookmarkModelView._filter_arg', return_value='filter_name'):
+        assert filter_key(None, idx) == f'flt{char}_filter_name'
+
+
 @pytest.mark.parametrize('disable_favicon', [False, True])
 def test_bookmark_model_view(bukudb, disable_favicon, app):
     inst = BookmarkModelView(bukudb)