Add Video Watermark
Overlay a local image on a video at a selected corner with configurable scale.
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浏览器内运行这个工具能做什么
Add a PNG, JPEG, or WebP overlay to a local video. Choose the corner and watermark width before re-encoding to MP4.
Processing starts only after you choose files and press the action button. The media engine is not preloaded on the homepage or ordinary tool pages.
这个工具可以完成什么
Place a transparent PNG at the bottom-right of a presentation recording.
依赖结果前需要检查什么
- The image is burned into every output frame and cannot be removed losslessly later.
- Large overlays or source videos increase encoding time and browser memory use.
如何使用
- 1
Choose the video files from your device.
- 2
Review the detected media facts and task-specific controls.
- 3
Start the local job, watch progress, or cancel to terminate the worker.
- 4
Play or inspect the downloaded result before replacing the source.
使用场景
Place a transparent PNG at the bottom-right of a presentation recording.
Choose the video and overlay image, set scale and corner, encode, then inspect contrast and safe margins.
使用技巧
Confirm codec and browser support before committing device time to a long source.
Every output is a new file. Retain the original until you have completed a full playback check.
常见问题
Is my media uploaded to TOOLGRID?
No. The selected files are written into an in-browser worker file system. The self-hosted encoder assets are downloaded separately, but TOOLGRID does not receive the selected media for processing.
Why can a local media job be slow?
The compatibility encoder runs single-threaded in WebAssembly and is limited by device CPU, available memory, source duration, resolution, codecs, and browser behavior.
What should I verify in the result?
Check playback, duration, seeking, video and audio synchronization, expected tracks, visual quality, and actual file size in the browser or player used by your audience.
下一步常用工具
如果还需要校验、转换或复用结果，可以继续打开相近的浏览器本地工具。