Blur a License Plate in Any Photo — Free, Private, In Your Browser

Selling a car online means handing a photograph of your vehicle to every stranger who scrolls past it. On Craigslist, Facebook Marketplace, Autotrader and eBay Motors those photos sit in public, indexable listings for weeks — and the sharpest one is almost always the three-quarter front shot with the license plate dead centre and perfectly legible. That plate is not a neutral detail. In many jurisdictions a registration number can be pushed through paid lookup services, insurance and vehicle-history databases, or simply leaked datasets, and come back attached to a name, a rough address, an accident record or a lien. It is also the single most useful string for anyone cloning plates onto a matching vehicle.

Blurring it takes ten seconds and costs a genuine buyer nothing — nobody has ever declined to view a car because they could not read the number plate in the advert. This page gives you both halves of the job: an AI pass that automatically detects and pixelates faces in the shot, and a manual redaction step for the plate, the VIN in the windscreen, the parking permit and the house number behind the car.

And it does it without the irony that runs through most of this category: uploading a photo to somebody else's server in order to anonymize it. Every "free online plate blur" service that asks you to hit Upload has, by definition, already received the unblurred original — plate, faces, background and all — and stored it at least long enough to process it. Here the file is read straight into a canvas element in your own browser. It never leaves your device, and closing the tab is the whole of the deletion process.

• Plates are identity keys. Registration numbers can be looked up — legally through commercial data brokers, and illegally through scraped databases — to reach an owner name, address history or insurance details.
• Plate cloning. A clear photo of your number plate is everything a cloner needs to fit a duplicate to a same-model car, after which their speeding tickets, tolls and congestion charges land on your doormat.
• Listing scrapers. Marketplace photos are harvested wholesale and re-posted in fake adverts. A blurred plate makes your images far less useful to scammers pretending to sell your car.
• Location leakage. The plate plus a recognisable driveway, street sign or house number narrows your home address to a single building. Blur the plate, and check the background too.
• It survives the sale. Listings get archived, cached and screenshotted. Redacting once, before you post, is the only version of this that works.

They are not equivalent. A Gaussian blur is a reversible mathematical operation in principle: the original pixels are averaged, not destroyed, and for a small, high-contrast, tightly constrained alphabet — which is exactly what a number plate is — de-blurring and brute-force reconstruction attacks are realistic. Researchers have repeatedly recovered blurred and pixelated text by rendering every candidate string, applying the same blur, and matching the result. Plates are the textbook worst case: fixed fonts, fixed character counts, known formats, high contrast.

For a license plate, use a solid fill. A hard black or white box discards the underlying pixels entirely — there is no signal left to recover, whatever anyone throws at it. Heavy pixelation with a very large block size is an acceptable second choice; a light artistic blur is not. Save blur for things where the shape still needs to read, like a face in the background of a group shot, and reserve the box for text: plates, VINs, addresses, document numbers.

Whichever you pick, do the redaction before you export, never by drawing a shape in an editor that keeps layers. And always download and re-check the final file — the version you upload to the listing is the only one that matters.