Scrubb.iowatermark test · denoiser · metadata stripper
Hello, and welcome
These are the image tools I build and use on the channel. They are free, and they are
for subscribers, so the first step is a quick sign-in that checks your subscription and
nothing else.
What is in here
Watermark test. Upload an image and find out whether it carries SynthID, the
invisible watermark added by Google's image tools and others that license it. You also
get its signed content credential if it has one, whatever its metadata says about
itself, and a map of where in the picture the mark could be read.
Denoiser. Flattens the noise out of an image while leaving faces and fine
detail alone. Download the cleaned image.
Metadata stripper. Removes every hidden tag from your images. This one runs
entirely inside your browser, so those files never leave your computer.
The sign-in asks to read your YouTube subscriptions. That permission is used
for one question, asked once: are you subscribed to
the channel? Nothing is
stored about you and no list of subscribers is kept.
Not subscribed yet? Subscribing is free, and the tools will be here.
SynthID detect and remove — free invisible watermark tools
Upload an image and find out whether it carries SynthID, the invisible watermark
Google adds to pictures made with its AI tools and licenses to others. Then strip the noise
layer that watermark lives in, and clear the metadata, without either file leaving your
control.
Detect SynthID in any image
The watermark test measures your image against the statistical pattern SynthID leaves behind
and tells you whether the mark is there. You also get the image's signed content credential if
it has one, whatever its metadata claims about itself, and a map showing where in the picture
the mark could actually be read — a flat sky holds far less of it than a detailed face.
Remove the layer a watermark sits in
SynthID is not a metadata tag, so deleting EXIF does not touch it. It rides in the fine noise
of the picture, which is why it survives resizing, cropping and re-encoding. The denoiser
flattens that noise while leaving faces and fine detail alone. Removal is not guaranteed on
every image — run the watermark test afterwards and it will tell you what still reads.
Strip metadata in your browser
The metadata stripper removes every hidden tag from an image without uploading it anywhere. It
runs entirely inside your browser, so those files never leave your computer.
Questions
What is SynthID?
An invisible watermark applied to images after they are generated, designed to survive the
edits that destroy ordinary watermarks. You cannot see it and you cannot find it in the
file's tags.
How accurate is the SynthID detector?
It is calibrated against thousands of images that carry the mark and thousands known not to,
and the bar is set where false positives on clean pictures are rare. No detector is perfect;
the result page shows you the evidence rather than only a verdict.
Does it work on cropped or resized pictures?
Yes. That is the point of the mark's design, and the detector is tested on downscaled and
natively small images as well as full-size ones.
What does it cost?
Nothing. The tools are free for channel subscribers, and the sign-in checks a subscription
and nothing else.
SynthID is a trademark of Google LLC. scrubb.io is an independent project and is not
affiliated with, sponsored by or endorsed by Google.
Upload an image and this measures its pixel-level noise against SynthID,
which is far too faint to see.
Drop an image here or click to choose one PNG, JPEG or WebP, up to 16 MB and 4096 px. It is analyzed and then deleted.
The denoiser finds the areas of a picture that are meant to be a single
flat color and makes them one, so speckle and banding disappear, while photographs,
faces, text edges and fine detail are left as they are. It takes about a minute on a
large image.
Drop an image here or click to choose one PNG, JPEG or WebP, up to 16 MB and 4096 px.
Removes every embedded tag from an image: camera and phone EXIF, GPS
coordinates, XMP, color profiles, thumbnails and the provenance manifests that AI tools
attach. The pixels are untouched. A JPEG comes back as a JPEG, rewritten rather than
re-encoded, so it stays byte-for-byte the same picture and gets smaller — only the
rotation flag is kept, and only when the image would otherwise come out on its side.
Your files stay on your computer.This tool is JavaScript in this page. It never
uploads anything, and it works with the network switched off.
Drop images here or click to choose them Several at once is fine.
