A virtual card is a temporary card number that connects to your real account but can be controlled separately — with spending limits, expiration dates, or merchant locks. For free trials, they're the most reliable way to ensure you never get charged when you forget to cancel.

Here's how every major option stacks up in 2026.

Privacy.com (Best Free Option)

Privacy.com is the gold standard for free trial protection, and it's free for personal use. You create a virtual card number in seconds, set a spending limit (even $1.00), and use it anywhere Visa or Mastercard is accepted.

How it works for free trials

Create a "Merchant-Locked" card and set the spending limit to $1. When the service tries to charge you full price after the trial ends, the charge is automatically declined. Your real card is never exposed, and you never see an unexpected charge.

Pros

  • Free for personal use (up to 12 cards/month)
  • Can set per-merchant locks — the card only works with one merchant
  • Custom spending limits and pausing
  • Works with any US bank account or debit card
  • Browser extension for one-click card creation at checkout

Cons

  • Some merchants detect and reject virtual card numbers (especially subscription services that specifically block them)
  • US only — you need a US bank account
  • Free plan limited to 12 virtual cards per month

Best for: Anyone who regularly signs up for free trials and wants a set-and-forget solution.

Capital One Eno

Capital One's virtual card system, called Eno, is built into their browser extension and mobile app. It generates a unique virtual card number for each merchant, linked to your Capital One credit card.

How it works for free trials

When you sign up for a trial, the Eno extension can generate a virtual card number automatically. After the trial, you can freeze or delete that specific virtual card from the Eno app — the merchant's card number stops working, even if they try to charge you.

Pros

  • Free for all Capital One credit card holders
  • Automatically generates unique numbers per merchant
  • Freeze or delete any virtual card instantly
  • Builds on your existing credit card (earns rewards)

Cons

  • Requires an existing Capital One credit card
  • Cannot set custom spending limits (uses your card's credit limit)
  • Some merchants may still charge the physical card if the virtual number is declined

Best for: Capital One cardholders who want per-merchant virtual numbers without leaving their existing card ecosystem.

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Citi Virtual Account Numbers

Citi offers virtual account numbers for Citi credit card holders through their online banking portal. These are one-time-use or reusable virtual card numbers tied to your Citi card.

Pros

  • Free for Citi card holders
  • Can set expiration dates and spending limits
  • Does not expose your real card number

Cons

  • Requires a Citi credit card
  • Less flexible than Privacy.com — no per-merchant locking
  • Not available through a browser extension (must generate on Citi's website)
  • One-time-use numbers cannot be reused, which means you'd need a new one for a recurring subscription

Best for: Citi cardholders making one-off purchases where you don't want to expose your real card.

Apple Card Virtual Numbers

If you have an Apple Card, you can generate a unique card number for online purchases directly from the Wallet app. Apple Card automatically generates a different card number for each purchase when you choose "Card Number" as your payment method in Safari or other apps.

Pros

  • Seamless integration with Apple Pay and Safari
  • Unique number per merchant
  • Free for Apple Card holders

Cons

  • Cannot set spending limits
  • Requires Apple Card (US only, requires credit approval)
  • Cannot freeze a specific merchant's number — must manage through Wallet app

Best for: Apple Card holders who want privacy without needing a separate service.

Quick Comparison

Service Cost Spending limits Merchant lock Requires existing card
Privacy.com Free (12/mo) or $10/mo Pro Yes — custom $ Yes No (bank account only)
Capital One Eno Free No Yes (per-merchant) Yes (Capital One card)
Citi Virtual Free Yes No Yes (Citi card)
Apple Card Free No No Yes (Apple Card)

When Virtual Cards Don't Work

Some subscription services specifically detect and reject virtual card numbers to prevent exactly this kind of trial abuse. Netflix, Hulu, and a handful of other major services are known to decline Privacy.com numbers or other virtual card types.

If a service rejects your virtual card, the best backup is a calendar reminder — set it for 2 days before the trial ends the moment you sign up. Our guide on how to cancel a free trial before you get charged covers the full strategy, including what to do if you've already been charged.

For finding subscriptions you've already accumulated over time, spotting recurring charges you didn't know about is the most effective audit approach.