Choose your videos
Drag in one or more clips. Files remain in your browser and can be removed at any time.
ビデオの透かし
Add a text, logo, timestamp, or filename watermark to your video. Preview the result live and export privately in your browser.
ローカルで処理されるライブプレビューアップロードなし · MediaBunny + WebCodecs
ローカルで処理される
アップロードなし
アップロードなし
ライブプレビュー
表示されているものがエクスポートされます
表示されているものがエクスポートされます
バッチキュー
複数のファイルを順番に処理する
複数のファイルを順番に処理する
How it works
Add a video watermark in three steps
Protect brand videos, label review copies, or add useful metadata without opening a desktop editor. Adjust the overlay once and apply the same style to every file in the queue.
Customize the overlay
Choose text or logo, then set the font, color, opacity, size, position, timestamp, filename, or scrolling behavior.
Preview and export
Check the live preview, start the local render, and download each MP4 when it is ready.
Supported formats and limits
Input containers are detected locally. The output is a widely compatible MP4 with H.264 video.
MP4 / M4VMOVWebM / MKVAVI
Each file ≤ 2 GBLogo ≤ 10 MBOutput MP4 / H.264
一般的な使用例
Branding social clips
Add a subtle logo or brand name before publishing to TikTok, YouTube Shorts, Instagram, or other channels.
Review and approval copies
Show a filename, timestamp, or “draft” label so clients and teammates can identify versions quickly.
Batch content delivery
Apply the same watermark settings to a folder of product demos, lessons, screen recordings, or event clips.
Ownership and attribution
Use a visible but restrained mark to make the source of a clip clear when it is reshared.
ビデオはこのデバイスに残ります
MediaBunny and WebCodecs decode, overlay, and encode each frame locally. Source files, logos, and fonts are not uploaded or stored on a server.
FAQ
よくある質問
私のビデオはアップロードされますか?
No. The selected files are read and processed locally with MediaBunny and WebCodecs. They never leave this device.
どのビデオ形式がサポートされていますか?
You can select MP4, M4V, MOV, WebM, MKV, and AVI files up to 2 GB each. Browser codec support can vary, so MP4 is the safest input when a file does not decode.
Can I process multiple videos?
Yes. Add multiple files and export them in order. Every finished result has its own download button.
Can I use my own logo and font?
Yes. Upload a logo image up to 10 MB and a TTF, OTF, WOFF, or WOFF2 font. Transparent PNG logos usually look best.
Does adding a watermark reduce quality?
The video is re-encoded to MP4/H.264 so the overlay can be burned into every frame. The renderer uses a high-quality 5 Mbps target and preserves audio when the browser can decode it.
関連ビデオツール
Trim video
Cut out unwanted sections before adding your watermark.
Compress video
Reduce file size for faster sharing and delivery.
Convert video
Change the container or codec for compatibility.
Resize video
Prepare the right dimensions for social platforms.