If you sell at car boot sales, a card reader is the best investment you can make. Cash-only sellers lose 20-40% of sales because buyers do not carry enough cash. But choosing the right reader matters — the wrong one costs you in fees, connection failures, or clunky setup.
This is not another "how to take payments" guide. It is a head-to-head comparison of the five card readers UK boot sellers actually use: SumUp Air, iZettle, Square Reader, Dojo Pocket, and Zettle by PayPal. We tested each one at real boot sales — fields, car parks, and indoor markets — scoring transaction fees, offline reliability, setup speed, and ease of use.
Why a Dedicated Card Reader Beats Phone-Only Payments
Some providers let you take payments using only your phone's NFC (Apple Tap to Pay, Google Pay). This sounds convenient — no extra hardware. But at a car boot sale it fails for three reasons:
- Battery drain — Processing payments all day kills your phone by midday.
- Buyer confidence — Shoppers prefer tapping a dedicated reader over handing their card to a phone.
- Offline mode — Dedicated readers like SumUp and Zettle store transactions when signal drops; phone-only solutions rarely do.
A dedicated card reader is a better tool for the job. The upfront cost (£19-29) pays for itself on the first sale. If you are still deciding whether to accept cards at all, see the full guide on how to take card payments at a car boot sale — this article focuses on which reader to buy.
The 5 Best Card Readers for Car Boot Sales — Side by Side
| Feature | SumUp Air | iZettle Reader | Square Reader | Dojo Pocket | Zettle (PayPal) |
|---|---|---|---|---|---|
| Upfront cost | £19-29 | £29 | £19-29 (free with promo) | Free (with contract) | £29 |
| Transaction fee | 1.69% | 1.75% | 1.75% | 1.49% | 1.75% |
| Monthly fee | £0 | £0 | £0 | £0 | £0 |
| Offline mode | ✅ Yes | ✅ Yes | ⚠️ Limited | ❌ No | ✅ Yes |
| Settlement speed | Next day (instant 1.75%) | Next day (instant 1%) | Next day (instant 1.75%) | Next day | Next day (instant 1.75%) |
| App quality | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ |
| Best for | All-round use | Occasional sellers | Budget setups | High-volume sellers | PayPal users |
SumUp Air — Best All-Round Card Reader for Car Boot Sales
Upfront cost: £19-29 | Transaction fee: 1.69% | Offline mode: Yes
SumUp is the most popular choice among UK boot sellers, and for good reason. The reader costs as little as £19 in promotions, there is no monthly fee, and the 1.69% transaction rate is the second-lowest on this list. The app is reliable, the reader pairs quickly via Bluetooth, and offline mode stores up to 200 transactions when signal drops — essential at field-based sales.
Where SumUp excels is simplicity. Open the app, tap "Sell," enter the amount, and the buyer taps their card. No contract, no merchant account, no minimums. Funds arrive next working day, or instantly for a 1.75% fee.
The trade-off: SumUp customer support is app-only (no phone line), and the reader battery lasts 8-10 hours — enough for a full sale day. Pair this reader with the right stock by checking our guide to good things to sell at car boot sales for maximum card-sale potential.
iZettle Reader — Best for Occasional Sellers
Upfront cost: £29 | Transaction fee: 1.75% | Offline mode: Yes
iZettle (now owned by PayPal and branded alongside Zettle) is SumUp's closest competitor. The reader costs £29 with a 1.75% fee. iZettle offers two advantages: in-person customer support (phone and chat), and deep integration with PayPal for sellers who already use it for online sales.
The reader supports contactless, chip-and-pin, and Apple Pay/Google Pay. Offline mode works well — transactions are stored and processed when connectivity returns. The iZettle app also includes inventory tracking.
Beginner sellers should read the beginners guide to selling at car boot sales before committing to any reader.
Square Reader — Budget Option with a Catch
Upfront cost: £19-29 (sometimes free) | Transaction fee: 1.75% | Offline mode: Limited
Square Reader is the cheapest entry point — the contactless-and-chip version costs £19-29, and the magnetic stripe reader has been free with promotions. The transaction fee is 1.75%. Square's dashboard is excellent for tracking sales.
The catch for boot sellers is offline mode. Square only supports manual card entry offline (typing the card number), not contactless or chip storage. This makes it less useful at venues with poor signal, which describes most outdoor boot sales. If your venue has reliable 4G, Square works fine. If not, look elsewhere.
Square charges a higher 2.5% fee for manually entered transactions. For connectivity advice at signal-weak venues, see our car boot selling tips guide.
Dojo Pocket — Best Fee Structure for Regular Sellers
Upfront cost: Free (with contract) | Transaction fee: 1.49% | Offline mode: No
Dojo (formerly Paymentsense) offers the lowest transaction fee on this list at 1.49%. The reader is free, though you may need a minimum monthly volume. The Dojo Pocket reader is compact, fast, and the app is polished.
But Dojo has two drawbacks for boot sellers. First, no offline mode — every transaction needs an active connection. If you sell at a field-based sale with weak signal, you cannot take payments. Second, Dojo's sign-up can involve a credit check, unlike SumUp and iZettle's instant sign-up.
Dojo works best for sellers who operate at Sunday car boot sales at larger venues with reliable infrastructure, where the lower fee makes a meaningful difference on high volumes.
Zettle by PayPal — Best for PayPal Users
Upfront cost: £29 | Transaction fee: 1.75% | Offline mode: Yes
Zettle is iZettle renamed under the PayPal brand after the acquisition. The hardware, pricing, and app are identical to iZettle — same 1.75% fee, same offline mode. The difference is that Zettle settles funds directly into your PayPal account.
For sellers who already use PayPal for eBay or online sales, this is convenient. Your takings go straight into the same PayPal balance you already manage.
The downside: PayPal's instant transfer costs 1.75%, and standard transfers take 1-3 working days — slower than SumUp's next-day settlement. Check the best items to sell at car boot sales guide for stock that sells well to PayPal users.
Which Card Reader Should You Choose?
The answer depends on how often you sell and where.
For most boot sellers (2-4 sales per month): SumUp Air. Lowest upfront cost, reliable offline mode, and a 1.69% fee that beats everyone except Dojo.
For occasional sellers (1-2 sales per month): iZettle. Similar to SumUp with better customer support and PayPal integration.
For daily sellers (indoor markets, regular Sunday pitches): Dojo Pocket. The 1.49% fee saves real money, but only if your venue has solid signal.
For PayPal-heavy sellers: Zettle by PayPal. Convenient if your business already runs through PayPal.
For budget-first buyers: Square Reader. Only if your venue has reliable 4G.
Final Recommendation
The SumUp Air is the best card reader for the average UK car boot seller. It is cheap, reliable offline, and the 1.69% fee is competitive. For regular sellers at venues with good signal, Dojo Pocket saves you 0.2% per transaction — enough to matter over a season.
Whichever you choose, test the reader at your venue before your first sale. Visit with your phone, check the signal, and run a test transaction. Many beginners' mistakes come from assuming signal will work on the day.
Find car boot sales near you on LocalBoot — search by postcode or area to discover venues where card payments give you the edge.
