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Add Captions to Video

Auto-transcribe and burn subtitles into a video with Whisper — in your browser, nothing uploaded.

選擇音訊或影片檔案

MP3、WAV、M4A、MP4、MOV、WebM —— 用 Whisper 在瀏覽器中轉錄

點擊選擇，或將檔案拖曳至此

如何 Add Captions to Video

  1. 1

    Add your video

    Drop in an MP4, MOV or WebM with an audio track — it's read in your browser, never uploaded.

  2. 2

    Transcribe and review

    Whisper transcribes the speech into timed caption lines. Fix any mistakes right in the list before you burn them in — corrections after that point mean starting over.

  3. 3

    Style and export

    Pick a position and size, then download SRT/VTT subtitle files, or burn the captions directly into the video as a new file.

Related PDF tools

Add Text to VideonewBurn custom titles or captions onto a video at a chosen time — in your browser.影片轉文字用 Whisper 將影片的語音轉錄為文字與字幕（SRT/VTT）—— 在瀏覽器中處理，不上傳。音訊轉文字用 Whisper 將 MP3、WAV 或語音備忘錄轉錄為文字與字幕 —— 在瀏覽器中處理，不上傳。影片裁剪在瀏覽器中把影片裁剪到你想要的部分。

Add Captions to Video — 常見問題

Is my video uploaded?+

No. Both the Whisper transcription and the caption burn-in run entirely in your browser. The video never leaves your device.

Which browsers work?+

Transcription works broadly. Burning captions into the video needs WebCodecs — Chrome, Edge or Safari 17+. You can still download SRT/VTT subtitle files anywhere transcription works.

Can I fix mistakes before burning them in?+

Yes — every caption line is editable after transcription. Fix anything Whisper got wrong before you burn it in, since that step is permanent.

Does burning in captions reduce video quality?+

Slightly — it's a full re-encode of the video, the same trade-off as Compress Video. Pick a lower resolution source if file size matters more than quality.

你們會把我的檔案上傳到伺服器嗎？+

不會——這裡的每個工具都完全在你的裝置上處理檔案，不會向伺服器上傳任何內容。唯一的例外是 AI 工具，它們會把擷取的文字（而非檔案本身）傳送給 Claude 來完成工作。

有檔案大小限制嗎？+

我們沒有人為設下限制，但由於處理過程在你的瀏覽器中進行，非常大的檔案（超過 500MB 或 1000 頁）會受你裝置記憶體的限制，而非我們的限制。