Is it legal to have multiple accounts?

Two different questions hide in this search. One is whether the law forbids having more than one account, and in general it does not: no law we know of makes a second email address or a second shop a crime. The other is whether the platform allows it, and that is set by its terms of service, which differ a lot from one site to the next. Most trouble people get into over multiple accounts is the second kind. We are not lawyers, and this is not legal advice for your country.

The platform's terms are a contract

When you sign up, you agree to the platform's terms. Breaking them is breaking an agreement with that company, and the company enforces it itself: it limits, suspends or closes accounts. That is why the rules below matter more in practice than any statute. On 2 November 2026 the platforms' own pages said:

Platform	What its own page says
Reddit	"Yes! You're more than welcome to create multiple Reddit accounts", but not to vote on the same posts from several (Reddit Help)
X	Up to ten accounts "for different, non-duplicative purposes" (Authenticity policy)
Gmail	Several accounts are fine; multiple accounts used to repeat behaviour that was already prohibited are not (Gmail Program Policies)
Facebook	Each person should "create only one account (your own)" for personal use (Facebook Terms, 3.1)
Etsy	A second shop needs its own account with a different email, and every shop must be listed in each account's public profile (Etsy Help)
Walmart Marketplace	Sellers "are prohibited from making multiple seller accounts", with exceptions at Walmart's sole discretion (Walmart policy)
Upwork	One account and profile unless Upwork gives express written permission (User Agreement)
Fiverr	One active account per user (Terms of Service)

So "is it legal to have multiple accounts" has a different answer on each row, and none of them is a legal answer. On Reddit and X, several accounts are expected. On Facebook, a business uses Pages and a business portfolio instead of a second personal profile. On Upwork and Fiverr, a freelancer has one account, and an agency profile inside it is the way to grow.

The common thread is purpose. X allows ten accounts and forbids using them to inflate the same content. Reddit allows several and forbids voting with them. Gmail allows several and forbids opening a new one to carry on what got the old one disabled.

How it works: Bulk actions

When having multiple accounts can be illegal

The law cares about what the accounts are for. Using accounts to defraud people, to pass yourself off as a real person or company, to harass someone, or to dodge a court order is unlawful in most places whether it takes one account or fifty. The number is incidental.

In the United States there was a long argument about whether breaking a website's terms could itself be a computer crime under the Computer Fraud and Abuse Act. In Van Buren v. United States, decided on 3 June 2021, the Supreme Court read the law's "exceeds authorized access" clause narrowly, as a question of which parts of a computer system you may enter rather than why you use them. The Court noted that the government's broader reading would, as briefs put it, "criminalize everything from embellishing an online-dating profile to using a pseudonym on Facebook" (opinion, PDF, read 2 November 2026). It also said, in a footnote, that it was not deciding whether limits written in contracts or policies count. So the ruling narrowed the risk for ordinary terms breaches without settling every case. Other countries have their own laws, and a local lawyer is the person to ask about yours.

Legitimate reasons to run several accounts

Most people with many accounts are doing something ordinary:

• an agency or social media manager running clients' accounts
• a seller with a store on each marketplace that allows it
• a media buyer with ad accounts inside a platform's business tools
• a tester checking an app as several users, or an advertiser checking ads from other countries
• one person keeping work, personal and research browsing apart

The platforms have tools for most of these. Meta's business portfolios, Google Ads manager accounts and Etsy's second-shop rules exist so that a business can hold many accounts openly. Where a platform allows one account per person, the honest route is that platform's business or agency feature, not a second personal account. For agencies, the arrangements are in managing social media accounts for clients.

Where Mosaic stands

Mosaic gives each account its own browser profile, with its own cookies, fingerprint and proxy, so accounts you are entitled to run stay apart. It does not change what a platform allows, and we do not write guides for running more accounts than a platform permits. Whether the browser itself is legal to use is a separate question, answered in are anti-detect browsers legal. How sites tell accounts apart, whatever the rules, is in how websites detect multiple accounts, and running them tidily on one machine is in how to manage multiple accounts on one computer.