What image format should I use for the logo?

A PNG with a transparent background gives the cleanest watermark. JPG and WEBP also work, but they fill the area behind the logo with a solid color.

Can I choose where the watermark goes?

Yes. You can place it in any of the four corners or in the center, and adjust its size and opacity. A live preview shows the result before you process.

Can I make the watermark see-through?

Yes. Set the opacity to 70% or 40% for a subtle watermark, or keep it at 100% for a solid logo.

Does it add a Sondra logo to my video?

No. Sondra adds no branding of its own. The only watermark on your video is the image you upload.

Is my video uploaded to a server?

Never. Everything runs locally in your browser. Your files never leave your device.

Does the watermark stay for the whole video?

Yes. The image is shown over the entire clip from start to finish.

Yes. Adding a watermark on Sondra is free, with no signup and no extra branding.

Can I watermark a video on my phone?

Yes. Sondra works in mobile browsers, with files up to 100MB on mobile and 500MB on desktop.

What format is the output?

The watermarked video is saved as an MP4, which plays on virtually any device or platform.

Add a Watermark to Your Video

Overlay your logo or watermark on a video, pick the corner, size and opacity, free, private, and right in your browser.

Video to watermark

Logo or watermark image

Use a PNG with a transparent background for a clean logo. JPG and WEBP work too.

Add a video and a logo image to continue.

Fast 100% private Free

How to add a watermark to a video

Add your files

Pick the video and the logo or watermark image you want to use. They stay on your device.

Place and adjust

Choose a corner or the center, then set the size and opacity. A live preview shows the result.

Download

Save your watermarked MP4, ready to share or post.

Why add a watermark to a video?

A watermark puts your logo, name or handle right on the video, so it travels with the clip wherever it gets reposted. It is the simplest way to brand your content and discourage other people from passing it off as their own.

Sondra overlays your image on top of the video and lets you control where it sits, how big it is, and how see-through it is. A transparent PNG gives the cleanest result, but a JPG or WEBP works too. Lower the opacity for a subtle watermark, or keep it solid for a bold logo.

It adds no Sondra branding of its own and runs entirely in your browser, so your files are never uploaded. Drop in your video and logo, position it, and download the result.

What you can do with a video watermark

Adding a watermark is useful any time a video carries your brand. Here are the most common cases.

Brand your content

Put your logo or handle on every clip you post so viewers know the source.

Protect your work

Make it harder for others to repost your video as their own.

Promote a channel

Add your username so new viewers can find you when a clip spreads.

Mark a draft

Stamp a preview or proof with a label before the final version goes out.

Watermarks for every platform

A watermarked MP4 plays anywhere. A few notes for the most popular places.

YouTube

A corner logo keeps your brand on screen without covering the action.

TikTok and Reels

Keep the watermark clear of the bottom UI so captions and buttons do not hide it.

Instagram

A subtle, lower-opacity mark looks clean in feed and story posts.

Client work

Use a bold watermark on drafts, then export a clean version once approved.

Private by design

Most online watermark tools upload your video to a server first. Sondra does not. All the work happens inside your browser on your own device, so your video and logo are never sent anywhere and nobody else can see them.

That also means there is no waiting for a long upload, no account to create, and no limit on how many videos you watermark. Close the tab and nothing is left behind.