Watch anything. In any language. In the original voice.
Blitsum uses AI to generate subtitles, translate in real time with full context, and preserve the original speaker's voice — no dubbing studios, no subtitle files.
Free during beta · Mac & Windows · No spam
"I never thought I'd see you again."
Three steps. Zero friction.
Drop any video file
MKV, MP4, AVI — any format works. Blitsum handles the heavy lifting instantly.
Pick your language
100+ languages. Context-aware translation that understands slang and nuance, not just word-by-word dictionary matching.
Watch
Subtitles appear in seconds. Voice cloning coming soon for a truly localized audio experience.
Built different.
Context-aware translation
Understands scenes, emotional tone, and cultural references, not just sentences.
Original voice preserved
The actor still sounds like themselves. Our voice engine matches pitch and timbre. (Coming in v2)
Fully local processing
Privacy first. Your files never leave your device. All AI processing happens on your GPU.
100+ languages
From Japanese to Swahili. Break down any language barrier with state-of-the-art LLMs.
Every format
FFmpeg-powered playback. Optimized for HEVC, ProRES, and high-bitrate raw video.
Developer API
Build real-time translation into your own video apps. (Coming soon)
Be first to try Blitsum.
We're in private beta. Drop your email and we'll reach out when your spot is ready.