Wave two: the decoder works

A VIN decoder that never sends the VIN

Type a VIN and it is decoded here, in this tab, against a carried copy of the government database every other free VIN lookup queries over the network. Nothing about the vehicle leaves your browser, and after the first decode nothing needs to.

Decode a VIN

No account, no email step, no advertising on any page of this site.

Decoded here, in this tab

Decode a VIN without sending it anywhere

Type the seventeen characters from the doorframe, the registration document or the windscreen. The government database is downloaded once, and the VIN itself is never transmitted — there is no address on this site that would accept one.

Seventeen characters. I, O and Q never appear in a VIN, so if you are reading a 1 or a 0 you have read it right.

The answer

Type a VIN and press Decode. The first decode downloads NHTSA's vehicle database — about four megabytes — and every decode after that works with the network switched off.

How to check that claim in about thirty seconds

Every VIN decoder on the web says it respects your privacy. This one is the only one whose claim you can verify from your own machine, because the architecture is the promise:

  1. Open your browser's developer tools and go to the network panel.
  2. Decode a VIN. You will see one request — /data/vpic-2026-08.bin.gz, the vehicle database — and it is fetched before the VIN is read. It is byte-for-byte the same file every visitor gets.
  3. Now switch your network off, or go into aeroplane mode, and decode a different VIN. It still answers.

A decoder that works with the network off is a decoder that was never sending anything. The database is NHTSA's public vPIC dataset, August 2026 release, carried at about four megabytes compressed and unpacked by your browser's own gzip support. The whole mechanism is written out here.

Three calculators for what comes after the decode

Each one runs entirely in this browser as well, and none of them loads the vehicle database — a visitor who came for a tire calculator should not pay four megabytes for a decoder they did not ask for. None of them stores what you type, and none of them ends in a product listing or a lead form.

There is also a VIN check digit calculator, which shows the ISO 3780 arithmetic step by step — the page the decoder links to when the ninth character disagrees with the other sixteen.

Questions people ask first

Is the VIN really not sent anywhere?

Yes, and you can check it rather than believe it. Open your browser's network panel before you press Decode: the only request is the vehicle database, it happens before the VIN is read, and it is the same file for every visitor. There is no address on this site that accepts a VIN, so there is nothing for one to be sent to. Turn the network off after the first decode and the second one still works.

Why does decoding in the browser matter?

A VIN identifies one specific vehicle, and a seventeen-character string that names your car is worth something to whoever collects it. Every other free VIN lookup sends it to a server, because querying a database over a network is the only architecture available to them. The database here is public and small enough to carry, so the transmission is not a trade-off we accept. It does not happen.

What does a VIN number lookup here tell me?

Make, model, model year, body class, engine cylinders and displacement, transmission, drive type, the plant that built it and everything else NHTSA's pattern database records for that VIN — typically twenty to thirty fields. It is the same data every free decoder returns, because it is the same government source.

What does it not tell me?

Nothing about this particular car's life: no mileage, no owners, no accident, title or salvage history, and no window sticker. Those are not in the pattern database and never will be. Accident and title history reaches consumers only through commercial providers approved under NMVTIS, which publishes no public interface, so every free offer of one is a route to a paid report.

Why does the first decode take a moment?

It downloads about four megabytes: NHTSA's vehicle pattern database, compressed. That happens once. Your browser keeps it, so every later decode — on this visit or any other — is arithmetic against a file already on your device, and needs no network at all.

Do you spell it tire or tyre?

Tire, throughout. The data behind this site is United States federal data, the audience is a US-market car buyer, and the calculator is the one they will search for by that spelling. If you arrived looking for a tyre size calculator, it is the same page.