How to use Erasio
A complete walkthrough from installation to your first clean image or video download.
Watch the Demo
See Erasio in action with our video walkthrough.
Install the Extension
Visit the Chrome Web Store and click "Add to Chrome". Installation takes about 5 seconds.
The extension requests only the permissions it needs: access to Gemini's download events and local storage for your preferences. No personal data is collected.
Erasio — Gemini Watermark Remover
Browser extension
Open Google Gemini
Navigate to gemini.google.com, Google AI Studio, or Google Flow (labs.google/fx/tools/flow). The Erasio icon in your Chrome toolbar turns active, confirming it's ready.
Erasio only activates on gemini.google.com, Google AI Studio, and Google Flow (labs.google/fx/tools/flow). It doesn't run on any other website and never monitors your general browsing.
Generate an Image or Video
Create any image or video with Gemini as you normally would. No changes to your workflow needed — Erasio listens in the background.
Erasio monitors download events. It doesn't intercept, slow down, or alter your image or video generation requests in any way.
Gemini prompt
Image"A fantasy landscape with glowing mushrooms..."
Download Watermark-Free
Click the download button on any Gemini image or video. The file saves to your computer instantly — clean and without any watermark.
For images, reverse alpha blending runs in microseconds; for video, Erasio re-renders each frame and keeps the original audio. The watermark is removed and the clean file hits your downloads folder.
Watermark-free
Extension or online tool — which should you use?
Erasio ships as two products sharing one engine. Most people want the extension; the online tool covers the cases where an extension is not an option.
| Chrome extension | Online tool | |
|---|---|---|
| Where it runs | Automatically on Gemini, AI Studio and Google Flow | erasio.io/tool — any file you drag in |
| Effort per file | None. Click download as you normally would | Drag in, wait for processing, download |
| Files already saved to disk | Not handled — it works at download time | Yes, this is the main use case |
| Batch processing | One file at a time, automatically | Up to 10 images at once when signed in |
| Browser support | Chrome, Edge, Brave, Opera | Any Chromium browser; images also work in Safari and Firefox |
| Account required | No | No — not for a single file |
Install the extension if you generate in Gemini regularly and want watermark removal to disappear into your normal workflow. Use the online tool if you already have watermarked files saved, if you are on a managed machine where extensions are blocked, or if you want to try Erasio before installing anything.
Where Erasio works, and what differs on each platform
Erasio activates on three Google surfaces. The engine is the same everywhere, but what you can expect differs.
Google Gemini — gemini.google.com
Both images and Gemini Omni video. The extension attaches on page load and intercepts the download click, so the file that reaches your downloads folder is already clean. Nothing about your prompt or generation is touched — Erasio only reacts once you ask for the file. If you use the in-page preview, you can inspect the result before saving and jump into the side panel to adjust settings first.
Google AI Studio — aistudio.google.com
Image outputs carry the same sparkle pattern as consumer Gemini, so the standard engine handles them without any change of setting. AI Studio exports at higher resolutions more often than the consumer app; that is fine — removal accuracy does not depend on resolution, since the mark is scaled with the image and detected relative to it.
Google Flow — labs.google/fx/tools/flow
Video only. Flow renders through more than one underlying model — Omni Flash for fast generations, Veo for higher-fidelity clips — and the alpha map differs slightly between them. Erasio identifies which model produced the clip on upload and selects the matching pattern. Flow is also the surface where Google iterates fastest, so it is the most likely place to meet a watermark variant that needs a settings tweak.
If the watermark isn't fully removed
Google revises the watermark periodically — position, size and opacity have all changed more than once. When a mark survives removal, it is almost always one of the following. Work through them in order.
1. Confirm the extension is current
Open chrome://extensions, enable Developer mode, and click "Update". Pattern calibration ships inside the extension, so a version from before Google's last watermark change will not recognise the current mark. This resolves the large majority of reports.
2. Try the dedicated Veo & Omni model
The default engine is tuned for the standard Gemini sparkle. Video from Veo or the Gemini Omni Sparkle variant is better served by the dedicated model at /veo-and-omni-watermark-remover, which runs a different pipeline and auto-tunes rather than relying on your saved settings.
3. Adjust the mask settings
If a faint outline survives, the mask is slightly misaligned for that variant. Mask scale, offset and strength are all adjustable in the side panel, and the settings guides walk through what each control does and which direction to move it.
4. Re-download the original from the source
A file that has already been screenshotted, compressed, re-encoded or passed through another editor no longer carries the clean alpha-composited mark Erasio inverts. Removal is mathematical, so it needs the original file — not a copy of a copy. Go back to Gemini or Flow and download the source again.
5. For video, check the resolution and length
The online tool accepts MP4 up to 100 MB. Longer or larger clips should go through the extension, which processes at download time without the upload-size ceiling. If processing stalls, a very long clip on a low-powered machine is the usual cause — every frame is decoded, patched and re-encoded locally, and that work is real.
Still seeing a faint outline or a ghost of the mark after removal? Each kind of residue has a different cause, and only some are fixable with a setting.
7 causes of leftover watermark residue, and the fix for each →Nothing happening at all — files still downloading watermarked? Eight checks in order, including the anti-fingerprinting conflict that breaks removal silently.
The extension isn't removing the watermark: a diagnostic checklist →What Erasio does not do
Erasio removes the visible sparkle logo Google composites into the corner of generated images and video. That is the whole of what it does, and it is worth being precise about the boundary.
Google also embeds SynthID — an invisible provenance signal distributed across the pixel grid, not a logo in a corner. SynthID is a different mechanism entirely, it survives re-encoding, and Erasio neither targets nor removes it. A file cleaned with Erasio still carries whatever invisible provenance Google embedded in it, and still identifies as AI-generated to any tool that reads for SynthID.
Erasio is built for media you generated yourself and have the right to use. It is not a way to strip attribution from someone else's work, and it does not remove watermarks belonging to stock libraries, photographers or other creators — the engine is calibrated to Google's specific alpha-composited patterns and does nothing at all with anything else.
Nothing you process is uploaded. Every operation described on this page runs on your own device, in your own browser, which is also why the tool works offline once loaded and why we never see the files you clean.
Common questions
Do I need an account to remove a watermark?
No. The extension works without signing in, and the online tool processes a single file for guests. An account raises your daily cap and unlocks batch processing for up to 10 images at once, but nothing about the removal quality changes.
Does removing the watermark reduce image or video quality?
Images come out as lossless PNG with the original pixels under the mark recovered by inverting the alpha blend — not repainted by an AI guess, so there is no halo or smudge. Video is re-encoded, which is unavoidable when every frame changes, but Erasio matches the encode to the source rather than using a fixed bitrate, and the original audio stream is copied across without re-encoding.
Is my image or video uploaded to a server?
No. Processing happens entirely in your browser using Canvas and WebCodecs. The only network request associated with processing is a credit charge when you are signed in, which carries your auth token and nothing else — no file, no frames, no filename.
Does it work on videos with audio?
Yes. The audio track is copied across byte-for-byte and is not re-encoded, so it comes through identical to the source.
Which browsers are supported?
The extension needs a Chromium browser — Chrome, Edge, Brave or Opera. The online tool runs image removal in any modern browser including Safari and Firefox; video removal needs WebCodecs, which currently means a Chromium browser.
Why did the watermark come back on a file I already cleaned?
It did not — you almost certainly re-downloaded the original. Erasio does not modify anything on Google's side, so the copy stored in your Gemini or Flow history still carries its watermark. The clean version is the file already saved on your device.
Prefer the Online Tool?
No extension needed. Upload your Gemini images or videos directly and download them clean — all in your browser.