Add Watermark to Video

Burn your logo or a watermark image onto a video — in your browser.

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 Watermark to Video

1
Add your video
Drop in an MP4, MOV or WebM — it's read in your browser, never uploaded.
2
Add your logo
Drop in a PNG, WebP or JPG — a PNG with a transparent background works best.
3
Position and download
Pick a corner, size and opacity, then click Add watermark.

Is my video uploaded?+

No. The logo is burned into the video entirely in your browser.

What image formats work for the logo?+

PNG, WebP or JPG. PNG with a transparent background looks best, since the logo is drawn exactly as-is over the video.

Can I make the watermark semi-transparent?+

Yes — the opacity slider goes from barely-there to fully solid.

Which browsers work?+

Chrome, Edge and Safari 17+ — burning it in needs WebCodecs.

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。