--- title: "Add Watermark to Video Online Free | CanDoYa" description: "Add a text or logo watermark to video online. Preview size, opacity, and position, then export a private MP4 locally with no account or upload." url: https://candoya.com/tools/add-video-watermark/ locale: en type: browser-tool --- # Add Watermark to Video Category: Social & Creator ## How can you add a watermark to a video online? Choose a video, enter watermark text or select a logo, then adjust its size, opacity, and position over the live preview. Export creates a new MP4 with the mark on every frame. The source video, logo, and finished file remain in your browser instead of entering an upload queue. This video watermark tool supports two practical marks: a short text label such as a creator handle, or a JPG, PNG, or WebP logo. Nine position presets keep placement consistent from frame to frame. Size is relative to the video width, while opacity is baked into the overlay so the exported result matches the preview closely. The browser first turns either watermark type into a transparent PNG. FFmpeg WebAssembly then overlays that image across the full video, writes H.264 picture data, and keeps the first readable audio track as AAC. Subtitles, extra tracks, chapters, and source metadata are not copied. The engine downloads only when export starts; your media files are not sent with that request. ## How to use it 1. **Choose a video** - Drop in an MP4, WebM, MOV, MKV, AVI, MPEG, or another common video file. 2. **Create the watermark** - Type a short label and choose its color, or switch to Logo and select a JPG, PNG, or WebP image. 3. **Set placement** - Pick one of nine positions, then adjust size and opacity while watching the live preview. 4. **Export the MP4** - Apply the watermark to every frame, preview the finished file, and download it to your device. ## Who it's for - **Creators** can keep a handle or channel name visible when short clips are reposted. - **Small businesses** can add a transparent logo to product demos and social videos. - **Review teams** can mark an internal cut as DRAFT before sharing it with stakeholders. - **Teachers and presenters** can identify the source of reusable lesson recordings. ## Expert note A corner logo is least distracting but easiest to crop away. For attribution that survives square and vertical crops, move a semi-transparent mark toward the center and keep it clear of faces, captions, and important interface details. ## Frequently asked questions ### Is my video uploaded when I add a watermark? No. The selected video and logo remain in this browser tab. A WebAssembly build of FFmpeg processes the frames locally and creates the downloadable MP4 on your device. The engine code downloads when export begins, but your source, logo, and result are not uploaded to CanDoYa. ### Is this video watermark tool free? Yes. You can add text or a logo, preview the placement, render the result, and download it without an account, subscription, credit limit, or extra CanDoYa branding. Your device supplies the processing power, so practical limits depend on available memory and the video's length, resolution, and codec. ### How large a video can I watermark in the browser? The conservative limit is 100 MB on mobile or lower-memory devices, 250 MB on a typical desktop, and 500 MB on a high-memory desktop. Files near those limits can take time because the browser holds the source, video engine, decoded frames, watermark, and exported file at once. ### Can I add a transparent logo to a video? Yes. Choose Logo, then select a PNG, JPG, or WebP image up to 20 MB. A transparent PNG usually gives the cleanest result because its background stays transparent. You can change the logo's relative size, opacity, and position before creating the final MP4. ### Can I add text to a video as a watermark? Yes. Text mode turns a short label into a high-resolution transparent overlay with your chosen color, opacity, and position. A subtle dark edge keeps light text readable over mixed footage. The text is rasterized before export, so the result does not depend on fonts installed on the viewing device. ### Does the exported video keep its audio? Yes, when the source contains a readable audio stream. The tool writes the first audio track as AAC alongside the H.264 picture in an MP4. Silent clips stay silent. Extra audio tracks, subtitles, chapters, attachments, and original metadata are intentionally omitted from the new file. ### Will adding a watermark reduce video quality? The picture must be re-encoded so the watermark appears in every player. The export uses a high-quality H.264 setting, but any lossy re-encode can alter fine detail. Keep the original video as your master and add the watermark from that original instead of repeatedly editing an already compressed copy. ### Can a visible watermark stop video theft? A visible watermark can preserve attribution and discourage casual reuse, but it is not digital rights management. Someone may crop, cover, or retouch it. Place the mark over meaningful picture content when deterrence matters, keep original project files, and use licensing or platform reporting when stronger enforcement is needed. ## Related tools - [Video Compressor](https://candoya.com/tools/video-compressor/) - [Video Converter](https://candoya.com/tools/video-converter/) - [Video Filters](https://candoya.com/tools/video-filters/) - [Video Resizer](https://candoya.com/tools/video-resizer/) - [Video Thumbnail Generator](https://candoya.com/tools/video-thumbnail-generator/) --- *Markdown edition of , published for AI agents and other automated readers. Index of key pages: .*