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What Is Square? How It Works & Why Small Businesses Love It

Square is a mobile payment company that offers a suite of business software, point-of-sale (POS) systems, payment hardware products, and small business services like marketing tools and loyalty programs.

Unlike most payment processors, Square is available to businesses of all sizes and offers the most comprehensive free POS system on the market. The Square payment and POS app has been downloaded over 33 million times and has more than 4 million merchant clients.

Should You Use Square?

We’ll get into more detail on Square’s specific products below. But, generally, for any small business processing less than $120,000 per month, Square is the best POS and payment processing solution because it comes with no fixed monthly costs and offers incredible value with the free POS system. Visit Square to create your free account.

Visit Square

Square is the original mobile payment processing app and card reader. It had high adoption rates when it first launched because it allowed businesses to accept card payments anywhere instead of relying on cash or peer-to-peer payment apps. It also did away with the complex contracts and long-term commitments required by many merchant services.

Unlike most credit card processing companies, Square does not require an application or approval process and has no monthly fees or minimum requirements. Every free Square account has three main functions: payments, POS software, and online ordering.

Today in 2024, Square processes $210 billion every year.

How Does Square Work?

Square starts with simple, flat-rate payment processing that includes credit cards, contactless payments, and ACH transfers. Then, it offers various products within its ecosystem that all work together to form a complete small business management solution. However, some solutions, like Payroll, can stand alone.

Square continues to add to its offerings for small businesses, from improvements to the software to new systems. More on what’s new below, but first, let’s dive into Square’s core features.

Easy, Flat-rate Payment Processing

You can use Square to complete credit card transactions online, in your brick-and-mortar store, and on your mobile device when you’re on the go.

Square charges a flat rate price per credit card transaction. This means that the credit card company, customer’s bank, and merchant account processor fees are all wrapped up into one flat-rate fee. This is regardless of the type of card you are processing. The only difference in rates is whether you have to key in the numbers.

Square Payment Processing Fees

The advantage of this pricing model is its simplicity. You don’t have to worry about figuring out how much you are paying in credit card processing fees because you know in advance exactly how much you will pay. It’s the same flat rate, no matter what type of card your customer uses.

Top-rated Merchant Services

Square’s affordable and user-friendly payment processing is one of the best merchant services available for small businesses. In addition to mobile and in-store payments, every free Square account has a virtual terminal, invoicing, online payments, and tools to monitor and dispute chargebacks.

Free & Low-cost POS Software

In addition to excellent merchant services, Square offers free POS apps that can be downloaded onto iOS and Android smartphones and tablets or used with one of Square’s proprietary hardware products. The free, user-friendly app has an offline mode, making it suitable for both mobile and in-store sales.

On top of the standard free Square POS app, Square offers free and paid POS software subscriptions for retail, restaurant, and appointment-based businesses.

Each POS software product includes payment processing, inventory management, basic employee management, customer relationship management (CRM), reporting, analytics, and industry-specific functions.

Square POS: $0/mo

Square POS is a free, general-purpose POS system that allows you to process sales, track inventory, manage customers, and view reports. It works on any iPad, iPhone, Android device, and Square hardware. It’s best for individuals and small businesses on a budget.

Read our full Square POS review to learn more.

Square for Retail: $0–$89/mo

Square for Retail lets retailers scan barcodes to ring transactions, manage orders, and track inventory easily. You can assign and scan SKUs to each product, and Square’s inventory system will automatically track product levels, locations, and more. It also syncs seamlessly with Square Online for ecommerce and pickup orders.

There is a forever-free plan and a Plus plan with advanced inventory tracking, analytics, and team management.

Read our Square for Retail review to learn more.

Square for Restaurants: $0–$60/mo

Square for Restaurants allows businesses to manage front-of-house and back-of-house operations, including menus, floor plans, in-house customer orders, online orders, and kitchen displays. There is a forever-free plan and a Plus plan with better front-of-house tools and team management.

Read our Square for Restaurants review to learn more.

Square Appointments: $0–$69/mo

Square Appointments is similar to Square POS but with the added functionality of a full-fledged appointment management tool. Manage client booking for you or your employees, allow customers to book online, and automatically send email or text confirmations. Integrated payment processing means you can require a card on file for every client.

Read our Square Appointments review to learn more.

Affordable Card Readers & Registers

Square offers a range of POS hardware and equipment designed to facilitate point-of-sale (POS) transactions for businesses of all sizes. For smaller businesses, there are card reader options to securely accommodate magstripe, chip cards, and contactless payments anywhere.

On the other hand, Square’s advanced registers provide a complete point-of-sale solution, combining sleek hardware with easy-to-use software for streamlined operations. These registers come equipped with features such as touch-screen interfaces, integrated receipt printers, customer displays, and compatibility with peripherals like barcode scanners and cash drawers.

All of Square’s hardware and equipment come with data encryption and comply with industry security standards.

Square Reader for Magstripe: Free

Square offers the first Square Reader for magstripe for free to users. It connects to a mobile phone via the headset jack or the lightning connector to accept swipe payments using the free Square POS app.

Shop Square Magstripe Reader

Square Reader for Contactless and Chip: $49–$59

Square offers two versions of its reader for contactless payments and chip cards. The first generation is $49 and the second generation is $59. The main difference between the two is the charging port—the first generation has a micro USB charging port while the second generation has a USB-C charging port. Both card readers can come with an optional dock for $15.

The Square Reader for contactless and chip payments connects to a mobile phone via Bluetooth and accepts payments using the Square POS app.

Shop Square Contactless & Chip Reader

Square Terminal: $299

The Square Terminal is a standalone all-in-one credit card terminal with a built-in Square POS app. It accepts swipe, dip, and tap payments, and prints receipts. It can wirelessly connect with a smartphone or tablet running the Square POS app, and has an offline mode that lets users process payments while offline. Read our full Square Terminal review, or try it for yourself.

Shop Square Terminal

Square Register: $799

For businesses that require a complete fully integrated point-of-sale system, Square offers the Square Register. It has two displays—the bigger display serves as the display for the merchant, while the small display faces the customer and functions as the card reader.

The Square Register may be connected with other hardware that Square offers such as a cash drawer, receipt printer, kitchen printer, or barcode scanner. See our full Square Register review, or try it for yourself.

Shop Square Register

What’s New With Square

Square posts all of its product updates publicly in its community forum. Here are some of our favorite recent developments:

Square’s restaurant POS redesign is deployed across its mobile, tablet, kitchen display system (KDS), Square Terminal, and Square Register hardware as of March 5th, 2024. (Source: Square)

The redesigned Restaurant POS allows for greater customization with item pictures and tile colors. Plus, businesses have more granular control over item modifiers and can more easily access features and actions from more screens.


Square now offers Waitlist, which is available for users with a Square Appointments Plus or Premium subscription. This feature allows merchants to offer waitlists for appointment slots and services. (Source: Square)

Square has steadily made improvements to its appointments software, including recently adding waitlisting capabilities, and the ability to drag-and-drop appointments to reschedule them within the iOS and Android apps.


Square has launched Square Subscriptions for Square Online users. This feature allows merchants to create subscription plans for their products or services. (Source: Square)

Square’s newer subscription tool includes customizable billing, free trial options for your customers, multiple kinds of checkout and payment links, and the ability to adjust, pause, or resume billing cycles easily. Square’s subscription tools come with no monthly fee—just regular payment processing costs.


Square launched Tap to Pay on iPhone in September 2022 and Tap to Pay on Android in April 2023, which allows merchants to accept contactless payments using a compatible mobile device as a card reader. (Source: Square)

While Square’s tap-to-pay functionality has been available for some time now, the feature is finally gaining some traction and hitting the mainstream. It is an easy way to accept payments for the lower in-person rates without needing any specific hardware or card reader.


Square has launched Square Go, its new booking app, that connects seamlessly with Square Appointments, allowing consumers access to beauty and personal care businesses. (Source: Square)

Square Go sends customers push notification reminders and makes it easy for them to manage accounts, re-book or reschedule, and discover other local businesses. This customer-facing app currently has a 4.9 out of 5 rating on the App Store with over 56,700 reviews.


Free Online Ordering Website Builder

Square Online is the third free solution with every Square account. It’s a user-friendly site builder that can be used to create a business website or a basic ecommerce site or to add online ordering or order-ahead functionality to your business. You can also use Square Online for online appointment booking.

Compared to Shopify, Square’s advantage is that its system is compatible for all business types. Square Online includes a range of templates for retail, restaurant, event, appointment, and other business types. It automatically syncs orders, inventory, and customers with your POS and can be used to process curbside pickup, shipping, or local delivery orders.

Square’s Additional Tools

In addition to Square’s three free business tools: payments, POS, and online store, Square offers an array of business management solutions that can be used as a standalone tool or in conjunction with any of Square’s other products. One of the advantages of using Square is that businesses can mix and match the solutions they need to create the best setup for their needs.

Some popular solutions include:

  • Square Marketing: Square offers email and SMS text message marketing including automations, segmentations, and personalization options.
  • Square Loyalty: Customizable loyalty program that customers can enroll in right from the checkout screen or POS with automated rewards and messaging.
  • Square Payroll: Track time, pay employees, manage benefits, and automatically file tax forms.
  • Square Capital: Square offers small business loans of up to $100,000. This is only available for Square sellers but has fast approval and fast funding without a hard credit check.
  • Square Banking: Business checking and savings accounts plus small business loans available right from Square Dashboard. No opening, minimum, overdraft, or account fees.

Square also has paid add-ons for team management, invoicing, gift cards, and advanced online sales.

Square as the Best All-in-One Solution

As you can see from its merchant services, POS software, card readers, and add-ons, Square offers a full suite of tools to power most business types. Because of its price point, ease of use, and breadth of offerings, we highly recommend Square, and it has consistently performed well in our evaluations for many of our guides:

Square Alternatives

That said, the payments, point-of-sale, and ecommerce software space is full of competition and there are several other products we also highly recommend.

See our additional head-to-head comparisons:

Or, check out our full list of the top Square competitors.

Square Drawbacks

While Square has a lot to offer, it is not perfect. Here are the biggest drawbacks of using Square, and the most common reasons businesses choose to use an alternative:

  • Limited support hours: For certain plans, Square only offers phone support from 6 a.m.–6 p.m. Pacific time, Monday–Friday. If you operate outside of these hours, you may need to wait to get support.
  • Inconsistent support quality: The level of support you receive and general product knowledge highly depends on the representative you come into contact with, which we have experienced first-hand in our calls to Square support.
  • Payment processing fees: While Square’s fees are transparent and average, they aren’t the lowest on the market. As you can see in our alternatives above, PayPal and Clover offer lower rates, as do some other payment processors.

Frequently Asked Questions (FAQs)

These are some of the most common questions we get about Square.

For most small merchants, Square is free to use. There are no monthly fees for setting up your store, opening a website, and taking payments. The only cost for doing business with Square is if you need advanced tools and the credit card processing fees, which are impossible to avoid.


Square is used by small businesses—even startups that want to set up their store for free or with minimal cost. It supports retail, restaurants, and appointment setting for service-type businesses. Small, mobile businesses will also find Square an ideal solution for selling and accepting payments on the go with their mobile devices.


Yes, Square has no monthly fees and offers a month-to-month contract, so you can use Square even if you only sell occasionally, are a solopreneur, or a member of an organization. The application process will allow you to specify that you are an individual using Square, and you can also choose a business type to specify the type of product or service you offer.


Individuals need to be at least 18 years of age to sign up with Square. At the time of application, you must provide your full name, SSN or Tax Identification Number, date of birth, and home mailing address. You must also connect a traditional bank account to accept payments through Square.


Both Square and PayPal offer POS software. However, Square is considered one of the top POS systems in the industry. Both also provide payment processing services, but Square supports more features for in-person and mobile payments. PayPal, on the other hand, offers stronger online payments and is better for international transactions.


Cash App is a peer-to-peer (PSP) payment app owned by Square’s parent company, Block. This free mobile payment service allows individuals to send, receive, request, spend, save, and invest money. Because Square and Cash App are both owned by Block, Cash App can be accepted as a payment option on both Square Online and Square POS.


Bottom Line

Square has become the go-to solution for pay-as-you-go flat-rate payment processing. Every year, Square continues to enhance the features of its free POS software, including solutions specifically designed for retail, restaurants, and appointment-based businesses like salons, in addition to its generic small business POS. Even more, it offers business tools from payroll and marketing to banking. Overall, we highly recommend Square for small businesses. Visit Square to create a free account.

Visit Square

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