The encyclopedia
Dark Pattern

The Pre-Checked Box

The effect

"You bought something you never agreed to buy."

The method

Pre-check upsells, insurance, donations, marketing consent, or recurring shipments at checkout, betting users won't notice.

Black hat
8/10
Most common usage on the angel→devil scale
The ethics spectrum

Same hack. Three very different choices.

White hat

All optional add-ons start unchecked.

Grey hat

Inexpensive, easy-to-remove add-ons (a 50¢ donation) pre-checked transparently.

Black hat

Pricey, hard-to-cancel add-ons (insurance, shipping protection, magazine subs) pre-checked.

The template

A formula you can steal

Audit [CHECKOUT CHECKBOXES] → uncheck everything not explicitly chosen.
Spotted in the wild

Where you've already seen this

  • Airline checkouts pre-selecting 'travel insurance' for $35.
  • Domain registrars pre-checking 'WHOIS privacy' as a paid add-on.
  • Donation forms with the 'cover processing fee' box pre-ticked.
When to use it

When the default is genuinely better for the user 90%+ of the time.

When NOT to use it

When the default extracts money or consent the user wouldn't actively give.

The 5-minute practice

Try the trick today

Take your checkout. Uncheck every pre-checked box. Re-check only those you'd defend to a journalist.

Don't get hacked
Want to avoid this trick being run on you? Take the AI Marketing Course →

Free Marketing Hacked module included. See more cautionary tales and learn the playbook from the inside.

See it in action

5 teardowns use this trick

The Concert Ticket That Doubled at Checkout
Checkout
Black
The Concert Ticket That Doubled at Checkout

A $89 ticket becomes $164 across four screens — anchoring, sunk-cost, and drip pricing weaponized in sequence.

9/10
Live eventsReveal the trick →
The 'Free' Trial That Charges $99 in Silence
Onboarding
Black
The 'Free' Trial That Charges $99 in Silence

A B2C app's onboarding stacks small-yes commitments with forced continuity to convert curiosity into an annual charge — without the user noticing.

9/10
Mobile appsReveal the trick →
Wells Fargo — When 'Eight Is Great' Became Two Million Fake Accounts
Outbound
Black
Wells Fargo — When 'Eight Is Great' Became Two Million Fake Accounts

A sales-quota slogan, weaponized down through every branch, turned a marketing target into 3.5M unauthorized accounts and $7B in fines. Marketing didn't open the accounts — but marketing made the goal that did.

9/10
BankingReveal the trick →
DraftKings & FanDuel — How '$1,000 Risk-Free' Wasn't Risk-Free
Ad
Black
DraftKings & FanDuel — How '$1,000 Risk-Free' Wasn't Risk-Free

Sportsbook ads promised 'risk-free' bets that returned site credit, not cash, with rollover requirements buried in 8-point type. NY AG forced rewording; multiple states now ban the phrase outright.

9/10
Sports bettingReveal the trick →
Epic Games / Fortnite — The $245M FTC Fine for One-Click Charges
Dark pattern
Black
Epic Games / Fortnite — The $245M FTC Fine for One-Click Charges

Fortnite's UI made it one tap to spend V-Bucks, near-impossible to refund, and trapped kids in 'unwanted purchases' confirm screens with no cancel. Largest FTC consumer refund in history.

10/10
GamingReveal the trick →