Extract & translate subtitles from video
Translate video audio to text online and extract subtitles from MP4, MOV, MKV. Dịch video sang phụ đề tiếng Việt trực tuyến. Extract and translate subtitles free — multi-language TXT/SRT, 100% browser AI.
Drop a video file here to extract text
MP4, MOV, MKV, WEBM — extract & translate subtitles 100% in your browser
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How to extract and translate video subtitles
Drop or select a video — MP4, MOV, MKV, or WEBM. Pick your target output language: Tiếng Việt, English, Español, 日本語, Français, 中文, or Auto-detect.
FFmpeg WASM extracts the audio track, the Web Audio API decodes it to an AudioBuffer, and Whisper-Tiny auto-detects the spoken language. When the target differs from the source, Whisper uses task translate (to English) and Opus-MT ONNX translates each segment to your chosen language — timestamps stay locked to the original video.
The progress bar shows Decoding file, then AI translating & transcribing. Export translated .srt subtitles for YouTube, Premiere, or CapCut, or download plain .txt.
Translate video audio to text online with zero server upload. Extract and translate subtitles free — 100% local AI for absolute privacy.
Why choose SnapKit? Our tools are 100% Private, No Server Upload, Instant Browser-Based, with No File Size Limit — plus free ringtone and video makers. Whether you merge PDFs, convert HEIC photos, or trim MP4 clips, your files stay on your device with zero cloud storage.
Why choose SnapKit?
Every tool is built around four promises: privacy, speed, freedom, and accessibility. No cloud pipeline — just your browser and your files.
100% Private — No Server Upload
Files are processed on your device with client-side WebAssembly and Canvas. No bytes are sent to our servers.
Instant Browser-Based speed
Skip slow uploads and downloads. Your CPU and GPU do the work locally for near-instant results.
No File Size Limit — Free forever
No registration walls, no watermarks, and no arbitrary caps. Use ringtone, video, PDF, and image tools freely.
Works on every device
iPhone, Android, Windows, and Mac browsers are all supported with the same private, instant experience.
Frequently asked questions
Can I translate an English video into Vietnamese subtitles?
Yes. Choose Tiếng Việt as the target language and upload your MP4 or MOV. Whisper auto-detects English, transcribes speech locally, then Opus-MT AI translates each line to Vietnamese with precise SRT timestamps — secure, accurate, and never uploaded to a server.
How do I dịch video sang phụ đề tiếng Việt trực tuyến?
Upload video, select Tiếng Việt in the target language menu, and click Extract text from video. Wait for decoding and AI translation to finish, then download SRT. The entire pipeline runs in your browser with Whisper and ONNX WebAssembly.
Which video formats support translation and extraction?
MP4, MOV, MKV, and WEBM. Audio is extracted client-side, then transcribed and translated with Whisper AI. Output languages include English, Vietnamese, Spanish, Japanese, French, and Chinese.
Do translated SRT subtitles keep original timestamps?
Yes. Each translated caption keeps the same start and end time as the source speech, so subtitles stay perfectly synced with your video in any editor or player.
Does this tool upload my video to a server?
No. Processed 100% locally inside your browser for absolute privacy. FFmpeg WASM, Whisper, and Opus-MT all run on your device — extract and translate subtitles free without cloud storage.
Is my data safe with this tool?
Yes. All processing runs 100% on your device using client-side WebAssembly, Canvas API, and browser APIs. No bytes from your files are transmitted to our servers — zero server upload, absolute privacy.
Why is the processing speed so fast?
Because your file never leaves your browser. SnapKit uses WebAssembly and Canvas to harness your device CPU and GPU directly, skipping slow network upload and download steps.