AnyTool
Your files never leave your device. All processing happens locally in your browser.

How do I add a watermark to a video without uploading it?

Open AnyTool's Video Watermark, drop in a clip, then add a text watermark (any font, color and outline) or upload a logo/image. Position it with 9 presets or drag it anywhere, tune opacity, size %, rotation, optional tiling and a time-window, and watch a live canvas preview. It burns the watermark in with ffmpeg's overlay filter using a self-hosted engine right in your browser — the video is never uploaded, the engine is bundled (no CDN), and there is no forced branding, no 720p or length cap and no account.

  • Text (font/color/outline) or uploaded logo/image watermark
  • 9 position presets + drag, opacity, size %, rotation, tiling, time-window
  • Live canvas preview, then burned in via ffmpeg overlay → MP4
  • Self-hosted engine — no CDN, no upload, no forced watermark

What is

Video watermarking

Video watermarking overlays text or a logo/image onto every frame of a video to mark ownership or branding. The mark is rendered to a transparent layer and composited onto the picture (here via ffmpeg's overlay filter), with controls for position, opacity, size, rotation, tiling and the time range it appears. Client-side watermarking burns it in within the browser, so the video is never uploaded.

Video Tools

Related terms

overlaylogobrandingopacityffmpeg

How to Add a Watermark to a Video

Burn a text or logo watermark onto a video in your browser.

40 secWeb browser
  1. 1

    Add a video

    Drop in a clip — it stays on your device.

  2. 2

    Add the mark

    Type text or upload a logo, then set position, opacity, size, rotation and time-window.

  3. 3

    Export

    Preview on the canvas, then burn it in and download an MP4 — nothing is uploaded.

Result: A watermarked video

Frequently Asked Questions

Yes — type a text watermark with any font, color and outline, or upload a logo/image.

Either is rendered to a transparent layer and burned onto the video via ffmpeg's overlay filter.

No — there is no forced watermark, no 720p or length cap and no account, unlike online video editors, VEED or popular design apps.

The video is also never uploaded and there is no size cap beyond your device memory.

Yes — 9 position presets or free drag, plus opacity, size %, rotation, tiling and a time-window.

Tiling repeats the mark across the frame to defeat cropping, and a live canvas preview shows it before you encode.

Detailed Explanation

Methodology

How the Video Watermark Tool Works

AnyTool watermarks video entirely in the browser using a self-hosted single-threaded ffmpeg.wasm engine — the core (ffmpeg-core.js + the 32 MB wasm) is bundled from npm and served as a same-origin asset, so nothing is fetched from a CDN. The watermark is composited first on a transparent HTML canvas: either text rendered with your chosen font, color and outline, or an uploaded logo, then positioned (corner/center), tiled or scaled and set to a chosen opacity. A live canvas preview lets you place it without re-encoding. When you export, that canvas is saved to a PNG, written to ffmpeg's virtual filesystem (MEMFS) alongside the video, and burned in with the overlay filter; the original audio is passed through and the result is re-encoded to H.264/AAC and read back as an MP4 blob. Single-threaded is deliberate: the multi-threaded core needs SharedArrayBuffer + cross-origin isolation (COOP/COEP), which would block cross-origin ad iframes.

  • Runs client-side — the video is never uploaded
  • Self-hosted ffmpeg core (bundled) — no CDN
  • Watermark drawn on a transparent canvas, exported to PNG
  • Text (font/color/outline) or uploaded logo; position/tile/opacity
  • Burned in with the ffmpeg overlay filter; audio passed through
  • Live canvas preview avoids re-encoding to check placement
  • H.264/AAC MP4; no backend, no signup, no size cap
Privacy & Security

Privacy & No Forced Watermark vs Upload-based Editors

Most online watermarking tools upload your video to a server, and editors like online video editors or VEED stamp their own watermark on free exports. AnyTool composites your watermark locally with a bundled engine and adds nothing of its own — there is no forced output watermark, no size cap and no signup, the file never leaves your browser, and it works offline after the first load.

Video watermarking: AnyTool vs typical tools
CapabilityAnyToolTypical tools
Data handlingIn your browserOften uploaded
Output watermarkNoneForced on free
Watermark sourceText or logo (canvas PNG)Varies
PlacementPosition / tile / opacityLimited
CostFree, no signupFree/limited

AnyTool is a privacy-first client-side watermarker — compositing runs locally and nothing is uploaded.