Brilliant. Thank you! I didn't actually find the answer in the documentation, but knowing that it's called "Imperavi Redactor", I searched a bit and found someone with the same problem. I just went to js/redactor.min.js and replaced this:else{if(f===49){this.shortcutsLoadFormat(g,"h1");}else{if(f===50){this.shortcutsLoadFormat(g,"h2");}else{if(f===51){this.shortcutsLoadFormat(g,"h3");}else{if(f===52){this.shortcutsLoadFormat(g,"h4");}else{if(f===53){this.shortcutsLoadFormat(g,"h5");}else{if(f===54){this.shortcutsLoadFormat(g,"h6");with this:else{if(f===49){/*this.shortcutsLoadFormat(g,"h1")*/return ;}else{if(f===50){/*this.shortcutsLoadFormat(g,"h2")*/ return;}else{if(f===51){/*this.shortcutsLoadFormat(g,"h3")*/ return;}else{if(f===52){/*this.shortcutsLoadFormat(g,"h4")*/ return;}else{if(f===53){/*this.shortcutsLoadFormat(g,"h5")*/return;}else{if(f===54){/*this.shortcutsLoadFormat(g,"h6")*/ return;Make a backup of the file before trying it ;)