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diff --git a/sw/inc/ToxWhitespaceStripper.hxx b/sw/inc/ToxWhitespaceStripper.hxx
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+++ b/sw/inc/ToxWhitespaceStripper.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef TOXWHITESPACESTRIPPER_HXX_
+#define TOXWHITESPACESTRIPPER_HXX_
+
+#include <rtl/ustring.hxx>
+#include <vector>
+
+namespace sw
+{
+/** This class helps to remove unwanted whitespaces from a string to use in a Tox.
+ *
+ * The new string will have
+ * - Newlines changed to spaces
+ * - Consecutive spaces merged
+ * - Trailing spaces removed
+ *
+ * It also allows to find the corresponding new positions of the input string in the stripped string.
+ * This is important for attributes which might have to be imported, e.g., it helps to answer the question:
+ * The 3rd character of the input string is subscript, which character in the output string is that?
+ *
+ * @note One leading whitespace is preserved.
+ */
+class ToxWhitespaceStripper
+{
+public:
+    ToxWhitespaceStripper(std::u16string_view);
+
+    sal_Int32 GetPositionInStrippedString(sal_Int32 pos) const;
+
+    const OUString& GetStrippedString() const { return mStripped; }
+
+private:
+    OUString mStripped;
+    std::vector<sal_Int32> mNewPositions;
+};
+
+} // end namespace sw
+
+#endif /* TOXWHITESPACESTRIPPER_HXX_ */