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Add Captions to Video

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

选择音频或视频文件

MP3、WAV、M4A、MP4、MOV、WebM —— 用 Whisper 在浏览器中转写

点击选择，或将文件拖到此处

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.视频转文字用 Whisper 将视频的语音转写为文字和字幕（SRT/VTT）—— 在浏览器中处理，不上传。音频转文字用 Whisper 将 MP3、WAV 或语音备忘录转写为文字和字幕 —— 在浏览器中处理，不上传。视频裁剪在浏览器中把视频裁剪到你想要的部分。

Add Captions to Video — 常见问题

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.

你们会把我的文件上传到服务器吗？+

不会——这里的每个工具都完全在你的设备上处理文件，不会向服务器上传任何内容。唯一的例外是 AI 工具，它们会把提取的文本（而非文件本身）发送给 Claude 来完成工作。

有文件大小限制吗？+

我们没有人为设置限制，但由于处理过程在你的浏览器中进行，非常大的文件（超过 500MB 或 1000 页）会受到你设备内存的限制，而非我们的限制。