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If you never capture an email address, the invoice you already send and the card your technician already carries are your only review channels. Here is how to make each one actually work.
Related research
Every review guide covers email and SMS, and rightly so, since those are the highest-converting channels for most businesses. But a meaningful share of local businesses either do not collect customer contact details at all, or serve customers whose phones stay in their pockets throughout the transaction.
If you run a busy counter, a trade where the customer is elderly, or a service where you leave a paper invoice behind, the offline channels are not a fallback. They are the only channels you have.
This guide covers the physical routes to a review request: invoices, receipts, leave-behind cards, packaging inserts and direct mail. For the digital side, review request email and SMS templates covers that ground properly.
A closely related question is answered in Google review attribution.
Offline review requests outperform email and SMS when you do not capture contact details, when your customers skew older, or when the transaction ends in person with something physical changing hands.
Digital wins on volume and convenience. Offline wins on the specific situations digital cannot reach at all.
Offline is the better channel when:
Digital remains better when you already hold contact details and the customer expects follow-up. Use both where you can, and offline alone where you must.
🛠️ Action Step: Ask whether you currently capture an email or mobile number for every customer. If the answer is no for more than a third of them, offline is not optional for you.
Print a review request with a QR code directly on your invoices, because the invoice is the one document a customer reliably reads and keeps.
Every trade and service business sends invoices. Almost none of them use the space.
How to do it properly:
On a paid invoice rather than an unpaid one is the better placement if your system allows the distinction. Asking for a review on a bill someone has not yet paid reads badly.
💡 Pro Tip: If your invoicing software supports a footer or terms field, that is usually the fastest place to add it, and it applies to every invoice you send from then on with no ongoing effort.
Give field staff a small card with a QR code to leave at the end of every job, because the moment work is completed is when satisfaction peaks and the technician is standing right there.
This is the highest-converting offline method for home services, and it depends entirely on whether your team actually hands them over.
What works on the card:
What makes or breaks it is the handover. A card left on the counter does very little. A technician saying "if we did a good job, this takes about a minute and it really helps us" converts substantially better.
⚠️ Common Mistake: Printing five thousand cards and not training the team on the sentence to say when handing one over. The card is not the mechanism. The ask is.
Place a QR stand at the point of payment, because that is where the customer is already stationary, already holding their phone, and already thinking about the transaction.
For retail, salons, cafes and any counter business, this is the equivalent of the leave-behind card.
Placement that works:
In waiting areas specifically, the customer is bored and receptive. A salon or clinic waiting room is one of the few places people will voluntarily scan a code for something that does not benefit them.
Never place it in a way that pressures. A stand a customer chooses to scan is fine. Staff watching them do it is not, and it produces stilted reviews.
Use packaging inserts for anything you ship or deliver, and reserve direct mail for high-value customers where the cost per request is justified.
Packaging inserts are cheap and reach customers who never appear in person. A florist, a bakery delivering cakes, or a business shipping products can include a small card at effectively no marginal cost.
Direct mail is expensive per request and only makes sense where the customer relationship is worth it. A home remodeller who completed a major project, a jeweller, a car dealership.
When mailing:
📊 Flento Data: Across local profiles, the strongest predictor of review volume is not the channel used but whether the request happens at a fixed, repeatable moment in the process. Channel matters less than consistency.
Point every QR code directly at your Google review form rather than at your homepage or profile, because each extra step loses a meaningful share of people.
This is where most offline attempts quietly fail. The code scans, the customer lands somewhere vague, and they give up.
Get this right:
🔥 Quick Win: Scan your own QR code right now with a phone you do not normally use. A surprising number of businesses discover theirs leads to a dead page or an old listing.
Flento generates the codes and links behind offline requests and tracks whether the reviews actually arrive.
Smart QR Code Generator produces review QR codes pointing directly at your review form, which is the step most businesses get wrong.
Google Review Management Software shows whether review volume responds after you introduce an offline channel, so you can tell if the cards are being handed over.
Google Business Profile Optimizer keeps the profile those reviews land on healthy and complete.
✅ Done? Generate a code that points to the right place. Get started free
Q: Do offline review requests actually work? A: Yes, particularly where digital cannot reach: cash businesses, older customer bases, and trades that leave paperwork behind. For businesses that capture contact details, digital generally converts better, so use both.
Q: Where should a review QR code point? A: Directly at your Google review form, never at your homepage or profile page. Each additional step loses people, and this is where most printed attempts fail.
Q: Is it against Google policy to ask for reviews on an invoice? A: No. Asking is permitted. What is not permitted is offering anything of value in exchange, or screening customers by expected sentiment before asking. Keep the request neutral and unconditional.
Q: How large should a printed QR code be? A: At least an inch square for something held in the hand, larger for anything read at a distance such as a counter stand. Ensure strong contrast and never print it over a photograph.
Q: Is direct mail worth the cost for review requests? A: Only for high-value customers where the relationship justifies the expense. For most businesses, invoice footers and leave-behind cards deliver far more requests per pound spent.
Q: What makes leave-behind cards succeed or fail? A: The handover, not the card. A card left on a counter does very little. A technician who says one sentence while giving it over converts substantially better, so train the sentence.
If you have your customers' email addresses, use them. If you do not, the invoice you are already sending and the card your technician is already carrying are the two channels sitting unused in your business right now.
Add the QR code to your invoice footer this week. It applies to every invoice from then on and takes about ten minutes to set up.
Then scan it yourself, from a phone you do not usually use, and make sure it goes where you think it does. Try Flento free.
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