Bleepster

Bleepster mutes swear words in YouTube videos while the video keeps playing. It reads YouTube's own captions, and an AI checks them in context, so it catches slang, disguised spellings and mixed languages that a word list would miss. Only the word goes silent, or you can pick a classic bleep. A 4-digit Parent PIN locks the settings, and the audio never leaves your browser tab. Works in Chrome, Edge, Firefox and Safari on Mac. The first 10 videos are free.