BentoSub - Fast, private AI subtitles — your video stays on your device

Hey PH! I built BentoSub after running into two problems that kept annoying me as a content creator: 1. Privacy. Most subtitle tools require you to upload your entire video file to their servers. A 2GB recording shouldn't need to travel to someone's cloud just to generate subtitles. 2. Mixed-language audio. I work with content that mixes Japanese and English — code-switching, loanwords, tech terms that shouldn't be translated. Standard ASR tools handle this poorly and usually just pick one language. How BentoSub works differently: Your video file never leaves your device. Audio is extracted locally in your browser using WebAssembly — only ~30MB of audio goes to our servers instead of your full video. It's deleted from our servers the moment your job is done. For mixed-language content, BentoSub uses a multilingual transcription model that handles code-switching naturally. Japanese-English, Korean-English, Chinese-English — loanwords and technical terms come out accurately. The workflow is simple: 1. Drop your video in (stays on your device) 2. Choose source + target language 3. Get bilingual subtitles in a few minutes 4. Edit in the browser, export SRT You get 30 free minutes to try it — no credit card needed. For the PH community — use code PRODUCT-HUNT for 100 free premium minutes. That's enough to subtitle 6–8 videos with our best-accuracy engine, including mixed-language support. No credit card required. Would love to hear your feedback, especially from creators who work with multilingual content. What features would make this a must-have for you?