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diff --git a/nikola/plugins/shortcode/thumbnail.py b/nikola/plugins/shortcode/thumbnail.py
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+++ b/nikola/plugins/shortcode/thumbnail.py
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+# -*- coding: utf-8 -*-
+
+# Copyright © 2017-2020 Roberto Alsina, Chris Warrick and others.
+
+# Permission is hereby granted, free of charge, to any
+# person obtaining a copy of this software and associated
+# documentation files (the "Software"), to deal in the
+# Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the
+# Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice
+# shall be included in all copies or substantial portions of
+# the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+# PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+# OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+"""Thumbnail shortcode (equivalent to reST’s thumbnail directive)."""
+
+import os.path
+
+from nikola.plugin_categories import ShortcodePlugin
+
+
+class ThumbnailShortcode(ShortcodePlugin):
+    """Plugin for thumbnail directive."""
+
+    name = "thumbnail"
+
+    def handler(self, uri, alt=None, align=None, linktitle=None, title=None, imgclass=None, figclass=None, site=None, data=None, lang=None, post=None):
+        """Create HTML for thumbnail."""
+        if uri.endswith('.svg'):
+            # the ? at the end makes docutil output an <img> instead of an object for the svg, which lightboxes may require
+            src = '.thumbnail'.join(os.path.splitext(uri)) + '?'
+        else:
+            src = '.thumbnail'.join(os.path.splitext(uri))
+
+        if imgclass is None:
+            imgclass = ''
+        if figclass is None:
+            figclass = ''
+
+        if align and data:
+            figclass += ' align-{0}'.format(align)
+        elif align:
+            imgclass += ' align-{0}'.format(align)
+
+        output = '<a href="{0}" class="image-reference"'.format(uri)
+        if linktitle:
+            output += ' title="{0}"'.format(linktitle)
+        output += '><img src="{0}"'.format(src)
+        for item, name in ((alt, 'alt'), (title, 'title'), (imgclass, 'class')):
+            if item:
+                output += ' {0}="{1}"'.format(name, item)
+        output += '></a>'
+
+        if data:
+            output = '<div class="figure {0}">{1}{2}</div>'.format(figclass, output, data)
+
+        return output, []