Does this remove SynthID from Gemini videos?

No. SynthID is invisible and embedded across the whole frame. This tool only edits the visible sparkle logo in the corner.

Is the video uploaded anywhere?

No. Processing happens in your browser with WebAssembly. The file is read from your device and the result is saved back to it.

Does it reduce video quality?

The clip is re-encoded to H.264 MP4. At the High setting the difference is not visible. Only the pixels inside your box change.

Is it free and does it add a watermark?

It is free with no account and no limits, and nothing is added to the output. Use it only on videos you generated or are allowed to edit.

Free · No sign-up

Gemini Video Watermark Remover

Erase the sparkle watermark from videos you generated in Gemini, right in your browser – no upload, no sign-up, no new watermark added.

AI · Paid creditsAI Video Watermark Remover AI Video Eraser

No upload
No sign-up
No new watermark
MP4, MOV, WebM, MKV, AVI

Drop a video here or click to choose

MP4, MOV, WebM, MKV, AVI · best under 300 MB

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Project sample · Free processing

A Gemini sparkle, before and after

This test clip from an MIT-licensed open-source project shows a Gemini four-point logo over a mountain road. The result uses this site’s free delogo settings. It is not an official Google example.

Original · visible Gemini sparkle

The same video frame after local delogo processing — After · free delogo filter

Both frames are at 2.000 s. The magnified crops show the same 100 × 60 pixel corner. The full video frame has not been cropped.

Videos load only after you click. Nothing is uploaded and no paid task starts.

Source: 1iki/gemini-watermark-remover · Gemini-marked project test sample
Video: 8 s · 720 × 1280 · 24 fps
Method: FFmpeg delogo · H.264 CRF 23
Processed: 2026-10-22

Native FFmpeg ran this site’s free filter and encoding settings. This is not an AI result, the upstream reverse-alpha result, or a browser speed test. Filling can smooth details; the full video is re-encoded. Invisible provenance was not verified.

Videos generated with Veo 3 inside the Gemini app come with two marks. One is a small sparkle logo in a corner of the frame. The other is SynthID, an invisible watermark spread across every pixel. This tool removes the visible sparkle only.

People reach for it when a Gemini clip is going into a product video, a presentation or a social post where the corner logo looks out of place. Because the sparkle is small and never moves, one tight box is usually all it takes.

Everything runs on your device. The page loads FFmpeg as WebAssembly, fills the marked corner from the surrounding pixels and writes a fresh H.264 MP4. Your generation never leaves your computer or phone.

Draw a small box

Hug the sparkle with a few pixels of margin. A smaller box gives the fill less to reconstruct and blends better with the background.

Check a few frames

The sparkle stays put, but what is behind it changes. Scrub the result. If a busy scene shows a smear, switch to Blur for that time range.

Use the highest export

Download the 1080p version from Gemini before removing the mark. More surrounding pixels means a cleaner patch than 720p.

All tools

A place for every edit.

Remove a logo, refine your footage, change a format or take the sound with you. Find the tool for your next step.

15 tools

Watermark removal

Start with the part you want to remove.

10 tools

Edit video

Shape the frame, timing and movement.

7 tools

Convert

Get the format your next step needs.

3 tools

Audio

Keep the sound, without the video.