Quick answer

• Want zero risk and don't mind the price? Buy directly from the Microsoft Store ($199.99).
• Want a lower price with a safety net? Buy a retail key from a reseller that offers a replacement or refund if the key doesn't activate, and pay with PayPal or a credit card.
• Avoid keys sold for a few dollars with no stated license type, and anything that asks you to run a "KMS activator".

Disclosure: KRBKeys publishes this page, and our own store is one of the options below. We have tried to describe every option fairly, including when buying directly from Microsoft is the better choice.

Cheap Windows 11 Pro key prices compared (October 2026)

We checked the Microsoft, KRBKeys and SftKey prices on their own websites on October 28, 2026; prices can change. Marketplace prices change daily, so we don't list one. Risk levels are our own assessment based on license type and refund options.

The 6 options in detail

1. Microsoft Store: $199.99

Buying from Microsoft's own store is the safest choice. You get a digital license linked to your Microsoft account, and Microsoft support handles any problem. The only downside is the price: about seven times what resellers charge. If your employer reimburses software, or you simply want no questions at all, this is the one to choose.

2. Upgrade Windows 11 Home to Pro from inside Windows

If your PC already runs Windows 11 Home, you can buy the Pro upgrade from Settings → System → Activation → Upgrade your edition of Windows. It's fast and keeps your files and apps. You buy the upgrade from Microsoft, so it's as safe as option 1, and the Microsoft Store app shows the price before you pay. Not sure you need Pro at all? Read Windows 11 Home vs Pro first.

3. KRBKeys (our store): $29.99

We sell Windows 11 Pro retail keys for one PC. The key arrives by email within minutes, activates online with Microsoft, and you can move it to a new PC later (see how to transfer a Windows 11 license). If a key doesn't activate, we send a replacement, or give a full refund if we can't, usually issued within 2–3 days (refund policy). You can pay with PayPal or a card, and we're rated 4.7 on Trustpilot from more than 450 reviews. You can read where our licenses come from on About our licenses.

4. SftKey: $28.99

SftKey is another small store selling Windows 11 Pro keys it describes as retail licenses for one PC, with digital delivery and a replacement-or-refund policy. It's priced about the same as us and has a 4.9 Trustpilot score from a smaller number of reviews (around 70 at the time of writing).

5. Marketplaces: Kinguin, G2A, eBay

Marketplaces list keys from many independent sellers, so prices can be lower, but quality depends entirely on which seller you pick. Some sell retail keys; others sell OEM or volume keys that may not be meant for resale. Check the seller's rating and how many sales they have, read the listing for the license type, and use the marketplace's buyer protection. Pay with PayPal or a credit card so you can dispute the charge if the key fails.

6. Keys that cost only a few dollars

Very cheap keys are usually OEM keys (tied to the first PC they're used on) or volume keys (MAK) meant for companies. They may activate at first and then stop working weeks later when Microsoft blocks the key, and the seller often has no refund policy. Never use a "KMS activator" or a script downloaded from a forum: these aren't licenses, they can carry malware, and Windows can deactivate at any time.

Retail, OEM or volume: which key should you buy?

• Retail: for one PC, activates online, and you can move it to a new computer. This is the one to buy.
• OEM: locked to the first motherboard it's activated on. Fine only if you'll never change PC.
• Volume (MAK/KMS): made for companies. Not meant for home users, and Microsoft is most likely to block them.

Our full guide explains the difference in plain language: Retail vs OEM vs volume keys.

Checklist before you buy a cheap Windows 11 Pro key

1. The seller states the license type (retail, OEM or volume). If the seller won't say, don't buy.
2. There's a written replacement or refund policy with a clear time limit.
3. You can pay with PayPal or a credit card, so you're protected if something goes wrong.
4. Reviews are on an independent site such as Trustpilot, not only on the seller's own pages.
5. The edition matches your PC: a Pro key upgrades Home to Pro; Pro N is a different edition.
6. There's a way to reach a person (email or chat) if activation fails.

How to check what kind of key you have

After activating, open Command Prompt as administrator and type:

slmgr /dlv

The window that opens shows the Description line, which tells you whether the license is RETAIL, OEM or VOLUME, and the License Status, which should say "Licensed". Our guide to activating Windows with CMD covers the other useful commands.