Skip to content
GigAI Tools

Add a Watermark to Video Online, Free, In Your Browser

Drop an MP4, MOV, WebM or MKV, type a caption or upload your logo, pin it to a corner or the centre and dial in the opacity, then burn it into a clean download. Powered by FFmpeg compiled to WebAssembly, it runs 100% on your device: your footage is never uploaded, and the tool never adds a watermark of its own.

100% browser processingFree · no sign-up
Loading tool…

What is the add watermark to video?

The Video Watermarker overlays a text caption (name, handle, URL or copyright line) or a logo image onto an MP4, MOV, WebM, MKV or AVI. Position it in any corner or the centre, set opacity, and control text font, size and color. Free, in the browser, with no uploads and no second watermark.

The GigAI Video Watermark tool brands and protects your footage the honest way, on your own machine, with nothing uploaded and no logo of ours stamped over your work. Drop a video and it probes and previews the file locally, then lets you overlay one of two kinds of mark. Choose text and you get a caption (your name, handle, URL or a © line) with control over the font size, color and how see-through it sits. Or upload a logo (PNG with transparency works best, plus JPG, WebP and SVG) and it's composited straight onto the picture. Either way you pin the mark to a corner or dead centre, drag the opacity from a faint ghost to a solid stamp, and see roughly where it lands on a live preview before you commit. When you export, a self-hosted FFmpeg WebAssembly core draws the overlay into every frame and re-encodes the clip, handing it back as a download with the new size shown next to the original. Because the whole pipeline runs in your browser tab, client footage, unreleased cuts and anything under NDA never leave your device, there's no upload bar reaching for the cloud, no queue behind other people's jobs, and, unlike most free watermarkers, no tool-branded stamp smuggled onto your result. It's honest about the trade-offs, too: WASM FFmpeg is single-threaded and memory-bound, so it's slower than a desktop app and happiest with files up to roughly a few hundred megabytes, and a text overlay uses the engine's bundled font rather than your system typefaces. A live progress bar shows exactly where the burn stands the whole way through, and closing the tab wipes every trace.

Difficulty:
Medium
Typical time:
~1–2m
Processing:
100% browser processing

Last updated

How to use the add watermark to video

  1. 1

    Drop your video

    Drag an MP4, MOV, WebM or MKV onto the workspace, or click to browse. It's read and previewed locally: nothing is uploaded.

  2. 2

    Choose text or a logo

    Type your caption and set its size and color, or switch to logo mode and upload a PNG, JPG, WebP or SVG. A transparent PNG gives the cleanest badge.

  3. 3

    Position & set opacity

    Pin the mark to a corner or the centre and drag the opacity slider from a faint ghost to a solid stamp. The live preview shows roughly where it lands.

  4. 4

    Burn & preview

    Hit Add watermark and watch the progress bar. When it finishes, the branded clip plays back so you can confirm the mark before you save.

  5. 5

    Download

    Download the watermarked video, carrying only your mark, and check the new size against the original right there on the result card.

What Add Watermark to Video includes

  • Text or logo overlay

    Stamp a caption (your name, handle, URL or a copyright line) or upload a logo image. Text mode adds font size, color and opacity control. Image mode composites a PNG, JPG, WebP or SVG straight onto the picture.

  • Corner or centre placement

    Pin the mark to any of the four corners or dead centre with a single click, and a live preview shows roughly where it will land before you burn it in. No guessing at coordinates.

  • Opacity you control

    Slide the watermark from a barely-there ghost that protects without distracting to a bold, unmistakable stamp. You choose how loudly the mark sits over your footage.

  • Honest live progress

    A determinate progress bar tracks the burn from start to finish, and a one-time note covers the first-run engine download. No endless spinner that leaves you wondering whether it stalled.

  • Preview, size delta & clean download

    Play the watermarked result before you save it and see the new file size next to the original, then download. No sign-up, no email, and no second watermark from us.

  • 100% in your browser

    A self-hosted FFmpeg WebAssembly core draws the overlay on your device. Your video and your logo are never uploaded, queued or stored, which makes it safe for personal, client and NDA footage alike.

Why use our add watermark to video

Brand without leaking

The usual way to watermark a clip online is to hand both the footage and your logo to a random server. Here the burn runs on your machine, so unreleased cuts, client work and confidential material never leave the tab.

No watermark of ours, no account, no cap

Free watermarkers love the irony of stamping their own logo onto your export or gating the download behind a sign-up. This one adds only the mark you asked for, cleanly, as often as you like.

Protect and attribute in one pass

A subtle overlay discourages re-uploads and casual theft while a corner logo or © line keeps your name on the work wherever the clip travels, deterrence and attribution from a single burn.

Nothing to install

No desktop editor, no plugin, no FFmpeg command line to memorise. Open the page in any modern browser and you're watermarking in seconds. It even keeps working offline once the engine has loaded.

Built for the way you work

From quick one-off fixes to daily workflows, see how people put this tool to use.

  • Content creator

    Stamp your handle on shorts

    Burn your @handle or channel name into the corner of a clip before you post it, so re-uploads still point back to you, without sending the raw file to a stranger's server first.

  • Freelancer / Agency

    Watermark client review cuts

    Overlay a semi-transparent 'DRAFT' or your studio logo on a work-in-progress edit before sharing it for approval, keeping unpaid or unreleased footage protected while it's out for review.

  • Photographer / Videographer

    Protect a portfolio reel

    Composite your logo onto a demo reel so screen-recorded copies still carry your brand, then swap the same overlay onto the delivered file at full opacity or remove it entirely.

  • Business / Marketer

    Brand a product demo

    Drop a corner logo onto a product walkthrough or webinar snippet so every clip that gets shared, embedded or re-cut keeps your name on screen. No editor licence required.

Supported formats

Accepts MP4, MOV, WebM, MKV and AVI, and produces MP4, WebM and MKV, all processed locally in your browser.

Input formats
  • MP4
  • MOV
  • WebM
  • MKV
  • AVI
Output formats
  • MP4
  • WebM
  • MKV

Frequently asked questions

Recommended tools

Video Trimmer

Cut and trim video online in your browser, drag a visual timeline to set exact start and end points, preview the selection, and download the clip. No uploads, no account, no watermark.

Video Studio

Video Compressor

Compress video in your browser with FFmpeg, shrink MP4, MOV, WebM and MKV files with a simple quality slider, see the exact bytes and percentage saved next to a live preview, then download. Nothing is uploaded.

Video Studio

Video Cropper

Crop video online in your browser, drag a box over a live preview or pick an aspect preset (1:1, 9:16, 4:5, 16:9) to reframe the picture, then download the cropped clip. No uploads, no account, no watermark.

Video Studio

Video Converter

Convert video between MP4, WebM, MOV, AVI, MKV and GIF in your browser with FFmpeg. Pick a target format, tune MP4 quality, preview the result and download. Nothing is uploaded.

Video Studio

Mute Video

Mute a video online in your browser, remove the audio track, preview the silent result, and download it. MP4, MOV, WebM and MKV, no uploads, no account, no watermark, and the picture stays untouched.

Video Studio

Reverse Video

Reverse a video online in your browser, play the footage and its audio backwards, preview the result, and download it. MP4, MOV, WebM and MKV, no uploads, no account, no watermark.

Video Studio

Comparisons & guides

Go deeper on the concepts behind the add watermark to video.

How to Add a Watermark to a PDF (Text or Image)

Guide

Stamp DRAFT, CONFIDENTIAL or your logo across every page of a PDF, control the opacity, angle and position. A quick, private, browser-based guide.

Read the guide

Guides & articles

Common problems, solved

Hit a snag? Here are quick fixes for the issues people run into most.

  • The first watermark is taking a while before the progress bar moves.

    The very first run downloads the FFmpeg WebAssembly engine (a one-time fetch that's then cached). You'll see a 'loading engine' note during that step. Subsequent burns skip it and start immediately.

  • My logo's transparency turned into a solid box.

    Use a PNG (or SVG) that actually carries an alpha channel: a JPG has no transparency, so its background shows as a rectangle. Export the logo as a transparent PNG and re-upload it. The tool preserves the alpha when it composites.

  • The text looks different from the font I use elsewhere.

    Text overlays are drawn with the font bundled into the WebAssembly engine, not your system typefaces, so the exact letterforms may differ. If you need a specific brand font, render your wordmark as a transparent PNG and add it as a logo instead.

  • It slowed to a crawl or ran out of memory on a big file.

    In-browser FFmpeg is single-threaded and works in your tab's memory, so long high-bitrate clips are demanding. Keep inputs loosely under a few hundred megabytes. On a huge file, trim or compress it first, then watermark the smaller result.

Get the most out of it

  • For attribution that survives cropping, place the mark near the centre or across a busy area rather than a corner a re-uploader can trim off.

  • A transparent PNG at 60–80% opacity reads as a professional badge. Push it to full opacity only when you want the mark to be the point.

  • Rendering your brand wordmark as a PNG and adding it as a logo gives you your exact font and colors, text mode uses the engine's built-in font.

  • Watermark last in your pipeline: trim and compress first, then burn the mark onto the final, smallest version so the encode is faster.

  • Keep inputs under a few hundred megabytes for the snappiest burn. The first run also downloads the engine once, so give watermark #1 a moment.

What's new

Recent updates and improvements to the add watermark to video.

  1. Initial release, drag-and-drop input, live preview, text and logo watermark modes, corner/centre placement, opacity control, font size and color for text, in-browser FFmpeg WebAssembly burn, live progress, before/after size and a download that carries only your mark.

  2. Added a live placement preview that shows roughly where the mark lands, plus transparent-PNG alpha handling for logo overlays and clearer guidance on the bundled text font.

  3. Tightened large-file guidance so heavy clips warn before they start, and improved logo compositing so semi-transparent PNGs keep their edges cleanly.

Keep exploring

Related tools

Problems we solve

Definitions

From the blog

Explore categories

Compare formats

By file type

Common tasks

Next steps

Your privacy is built in

Your video and your logo are read, previewed and watermarked entirely in your browser using a self-hosted FFmpeg WebAssembly core. Neither is ever uploaded to any server, queued, logged or stored. That makes the tool safe for personal recordings, client footage and anything under NDA. There's no account, and the only mark on your export is the one you added. We never stamp our own. Once the engine has loaded the tool keeps working offline, and closing the tab wipes every trace.

  • Runs in your browser
  • No uploads
  • Nothing stored

Ready to try the add watermark to video?

Free, private and instant. Add Watermark to Video runs right in your browser.

Add watermarkMore video studio