I used to be able to create a dictionary using qwebengine_convert_dict, following this process: https://forum.manjaro.org/t/qupzilla-spell-check-lost-after-upgrade-solution-also-works-for-falkon/6586/13 But after this change in upstream Arch: https://git.archlinux.org/svntogit/packages.git/commit/trunk?h=packages/hunspell-en&id=ddd1713c31e306620f8c0464b11e53593e23e788 Now I get: $ sudo qwebengine_convert_dict en_US.dic /usr/share/qt/qtwebengine_dictionaries/en_US.bdic[sudo] password for mparillo: Reading en_US.aff Reading en_US.dic en_US.dic_delta not found. Serializing... Verifying... Index doesn't match, word #étui ERROR converting, the dictionary does not check out OK.
That's utility that comes with QtWebEngine, so you should report the bug there.
Upstream Bug Report: https://bugreports.qt.io/browse/QTBUG-70034