Does my video get uploaded anywhere?

No. The video is read entirely in your browser using a local object URL. No data is sent to any server.

Why can't I download the watermarked video directly?

Re-encoding video in real time requires heavy libraries (e.g., FFmpeg.wasm) that are too large for a lightweight browser tool. Use the generated FFmpeg command to produce the actual output file on your computer.

How do I install FFmpeg?

Visit ffmpeg.org and download a build for your OS, or install via Homebrew (macOS: brew install ffmpeg), apt (Ubuntu: sudo apt install ffmpeg), or Chocolatey (Windows: choco install ffmpeg).

What video formats are supported for preview?

Any format your browser can decode — typically MP4 (H.264), WebM, and OGG. MOV files may work on Safari/Chrome on macOS.

Video Watermark Tool

Name: Video Watermark Tool
Availability: InStock
Author: Nham Vu

Preview your video with a custom text watermark overlaid in real time via Canvas. Export instructions for FFmpeg included.

1. Load Video Click or drag a video file here

2. Watermark Text

Position

Font Size: 32px

Opacity: 70%

Text Color

Shadow Add shadow

Margin: 20px

Live Watermark Preview

No video loaded

Load a video to see the watermark preview

Preview only. Browsers cannot re-encode video without large libraries. Use the FFmpeg command below to permanently embed the watermark in your file.

FFmpeg Command (Permanent Watermark)

Replace input.mp4 with your actual filename. Download FFmpeg

How to permanently watermark with FFmpeg

Install FFmpeg: brew install ffmpeg (Mac), sudo apt install ffmpeg (Linux), or download from ffmpeg.org (Windows).
Copy the generated command above, paste it into your terminal.
Run it — FFmpeg will render each frame with the watermark and produce output_watermarked.mp4.
Optional: add -c:a copy to keep original audio without re-encoding.

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Summary

Preview your video with a custom text watermark overlaid in real time via Canvas. Export instructions for FFmpeg included.

How it works

Your video never leaves your device. The browser reads it as a local object URL, draws each decoded frame onto a Canvas element, and composites your watermark text on top using the Canvas 2D API. Because the browser cannot re-encode video in real time without heavy libraries, this is a preview-only tool. The FFmpeg command shown is generated from your settings and can be run locally to produce a watermarked output file.

Use cases

Preview how a watermark will look before running FFmpeg.
Design watermark style, size, and placement interactively.
Generate a ready-to-run FFmpeg command for permanent embedding.
Quickly check branding placement on multiple videos.

Frequently Asked Questions

Last updated: 2026-06-11 · Reviewed by Nham Vu