diff --git a/components/Posting/Posting.php b/components/Posting/Posting.php
index db51381096..b5c96ff0b2 100644
--- a/components/Posting/Posting.php
+++ b/components/Posting/Posting.php
@@ -34,9 +34,6 @@ use App\Core\Router\Router;
 use App\Core\Security;
 use App\Entity\Activity;
 use App\Entity\Actor;
-use Component\Attachment\Entity\ActorToAttachment;
-use Component\Attachment\Entity\Attachment;
-use Component\Attachment\Entity\AttachmentToNote;
 use App\Entity\Language;
 use App\Entity\Note;
 use App\Util\Common;
@@ -46,6 +43,9 @@ use App\Util\Exception\RedirectException;
 use App\Util\Exception\ServerException;
 use App\Util\Form\FormFields;
 use App\Util\Formatting;
+use Component\Attachment\Entity\ActorToAttachment;
+use Component\Attachment\Entity\Attachment;
+use Component\Attachment\Entity\AttachmentToNote;
 use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
 use Symfony\Component\Form\Extension\Core\Type\FileType;
 use Symfony\Component\Form\Extension\Core\Type\SubmitType;
@@ -113,6 +113,9 @@ class Posting extends Component
                 ],
             ];
         }
+
+        Event::handle('PostingAddFormEntries', [$request, $actor, &$form_params]);
+
         $form_params[] = ['post_note', SubmitType::class, ['label' => _m('Post')]];
         $form          = Form::create($form_params);
 
@@ -122,7 +125,16 @@ class Posting extends Component
                 if ($form->isValid()) {
                     $data         = $form->getData();
                     $content_type = $data['content_type'] ?? $available_content_types[array_key_first($available_content_types)];
-                    self::storeLocalNote($user->getActor(), $data['content'], $content_type, $data['language'], $data['attachments']);
+                    $extra_args   = [];
+                    Event::handle('PostingHandleForm', [$request, $actor, $data, &$extra_args, $form_params, $form]);
+                    self::storeLocalNote(
+                        $user->getActor(),
+                        $data['content'],
+                        $content_type,
+                        $data['language'],
+                        $data['attachments'],
+                        process_note_content_extra_args: $extra_args,
+                    );
                     throw new RedirectException();
                 }
             } catch (FormSizeFileException $sizeFileException) {
@@ -142,8 +154,9 @@ class Posting extends Component
      * $actor_id, possibly as a reply to note $reply_to and with flag
      * $is_local. Sanitizes $content and $attachments
      *
-     * @param array $attachments           Array of UploadedFile to be stored as GSFiles associated to this note
-     * @param array $processed_attachments Array of [Attachment, Attachment's name] to be associated to this $actor and Note
+     * @param array $attachments                     Array of UploadedFile to be stored as GSFiles associated to this note
+     * @param array $processed_attachments           Array of [Attachment, Attachment's name] to be associated to this $actor and Note
+     * @param array $process_note_content_extra_args Extra arguments for the event ProcessNoteContent
      *
      * @throws \App\Util\Exception\DuplicateFoundException
      * @throws ClientException
@@ -151,8 +164,15 @@ class Posting extends Component
      *
      * @return \App\Core\Entity|mixed
      */
-    public static function storeLocalNote(Actor $actor, string $content, string $content_type, string $language, array $attachments = [], $processed_attachments = [])
-    {
+    public static function storeLocalNote(
+        Actor $actor,
+        string $content,
+        string $content_type,
+        string $language,
+        array $attachments = [],
+        array $processed_attachments = [],
+        array $process_note_content_extra_args = [],
+    ) {
         $rendered = null;
         $mentions = [];
         Event::handle('RenderNoteContent', [$content, $content_type, &$rendered, $actor, $language, &$mentions]);
@@ -181,7 +201,7 @@ class Posting extends Component
 
         // Need file and note ids for the next step
         $note->setUrl(Router::url('note_view', ['id' => $note->getId()], Router::ABSOLUTE_URL));
-        Event::handle('ProcessNoteContent', [$note, $content, $content_type]);
+        Event::handle('ProcessNoteContent', [$note, $content, $content_type, $process_note_content_extra_args]);
 
         if ($processed_attachments !== []) {
             foreach ($processed_attachments as [$a, $fname]) {
diff --git a/components/Tag/Tag.php b/components/Tag/Tag.php
index 1e81042733..6771f2e095 100644
--- a/components/Tag/Tag.php
+++ b/components/Tag/Tag.php
@@ -26,8 +26,10 @@ namespace Component\Tag;
 use App\Core\Cache;
 use App\Core\DB\DB;
 use App\Core\Event;
+use function App\Core\I18n\_m;
 use App\Core\Modules\Component;
 use App\Core\Router\Router;
+use App\Entity\Actor;
 use App\Entity\Language;
 use App\Entity\Note;
 use App\Entity\NoteTag;
@@ -36,6 +38,8 @@ use App\Util\HTML;
 use Doctrine\Common\Collections\ExpressionBuilder;
 use Doctrine\ORM\Query\Expr;
 use Doctrine\ORM\QueryBuilder;
+use Symfony\Component\Form\Extension\Core\Type\CheckboxType;
+use Symfony\Component\HttpFoundation\Request;
 
 /**
  * Component responsible for extracting tags from posted notes, as well as normalizing them
@@ -62,15 +66,20 @@ class Tag extends Component
     /**
      * Process note by extracting any tags present
      */
-    public function onProcessNoteContent(Note $note, string $content): bool
+    public function onProcessNoteContent(Note $note, string $content, string $content_type, array $extra_args): bool
     {
         $matched_tags   = [];
         $processed_tags = false;
         preg_match_all(self::TAG_REGEX, $content, $matched_tags, \PREG_SET_ORDER);
         foreach ($matched_tags as $match) {
-            $tag           = str_replace('#', '', self::ensureLength($match[2]));
+            $tag           = self::ensureValid($match[2]);
             $canonical_tag = self::canonicalTag($tag, Language::getFromId($note->getLanguageId())->getLocale());
-            DB::persist(NoteTag::create(['tag' => $tag, 'canonical' => $canonical_tag, 'note_id' => $note->getId()]));
+            DB::persist(NoteTag::create([
+                'tag'           => $tag,
+                'canonical'     => $canonical_tag,
+                'note_id'       => $note->getId(),
+                'use_canonical' => $extra_args['tag_use_canonical'],
+            ]));
             Cache::pushList("tag-{$canonical_tag}", $note);
             $processed_tags = true;
         }
@@ -94,6 +103,11 @@ class Tag extends Component
         return HTML::html(['a' => ['attrs' => ['href' => $url, 'title' => $tag, 'rel' => 'tag'], $tag]], options: ['indent' => false]);
     }
 
+    public static function ensureValid(string $tag)
+    {
+        return self::ensureLength(str_replace('#', '', $tag));
+    }
+
     public static function ensureLength(string $tag): string
     {
         return mb_substr($tag, 0, self::MAX_TAG_LENGTH);
@@ -147,4 +161,19 @@ class Tag extends Component
         $actor_qb->join('App\Entity\ActorTag', 'actor_tag', Expr\Join::WITH, 'actor_tag.tagger = actor.id');
         return Event::next;
     }
+
+    public function onPostingAddFormEntries(Request $request, Actor $actor, array &$form_params)
+    {
+        $form_params[] = ['tag_use_canonical', CheckboxType::class, ['required' => false, 'data' => true, 'label' => _m('Make note tags canonical')]];
+        return Event::next;
+    }
+
+    public function onPostingHandleForm(Request $request, Actor $actor, array $data, array &$extra_args)
+    {
+        if (!isset($data['tag_use_canonical'])) {
+            throw new ClientException;
+        }
+        $extra_args['tag_use_canonical'] = $data['tag_use_canonical'];
+        return Event::next;
+    }
 }