Four approaches, ranked by how well they actually work, and the two checks that stop you confusing a stranger for the person you're looking for.
Updated September 2026
You've got a username from somewhere, a gaming tag, a marketplace seller name, a handle in an old email, and you want to know where else that person is. Maybe you're vetting a buyer, reconnecting with someone, checking a date, or figuring out who's been impersonating you. The good news is that most of this is doable for free in a few minutes. The bad news is that most guides skip the part where you confirm you've found the right person.
Here are the methods in the order I'd actually use them.
Effort: 1 minute · Coverage: very high · Cost: free
This is the method that does most of the work. A bulk checker takes the handle and tests it against the profile URL of hundreds of platforms simultaneously, reporting which ones have an account under that exact name. Tools built on the open-source WhatsMyName dataset cover more than 600 sites, from the obvious (Instagram, TikTok, Reddit, X) to the ones people forget they joined (Letterboxd, Strava, Wattpad, Chess.com).
The one to start with is the WhatsMyName username search: no account, no install, results grouped by category in under a minute. Type the handle exactly as you have it, then try the obvious variants (no underscore, with a number, with a dot).
What you get back is a list of places where a profile with that name exists. Whether it's their profile is step 5.
Effort: 2 minutes · Coverage: medium · Cost: free
Put the handle in quotes and search it. Then try "handle" site:reddit.com, "handle" site:tiktok.com, and so on for the big platforms. This catches mentions of the username inside posts and comments, which a URL-based bulk search can't see. It misses anything the search engine hasn't indexed, which is a lot.
Effort: 3 minutes · Coverage: low but high-value · Cost: free
Once you have one confirmed profile with a photo, drop that image into Google Images, TinEye, or Yandex. This finds accounts that reuse the same picture under a different username, which is the most common way people slip past a name-based search. It's also the fastest way to spot a fake account using someone else's photo.
Effort: varies · Coverage: depends on the person · Cost: free
People link their own accounts together. A Linktree, a "find me on" line, a YouTube channel in a Twitch bio. Every confirmed profile is a starting point for two or three more. This is slow and manual but it's how you find the accounts under handles you didn't know about.
Paid people-search sites: they bundle a username lookup with data-broker records (address, age, relatives). For the username part they're usually less thorough than the free bulk tools, because their site lists are smaller. Pay only if you specifically need the public-records side, and expect it to be partly out of date.
If the reason you're searching is to decide whether to trust someone, a marketplace seller, a date, a prospective roommate, there's a separate guide on using a username search as a lightweight background check that focuses on reading the results fairly.
This is the step that separates a useful search from a wrong accusation. A common handle like alex_m exists on fifty sites and belongs to fifty people. Before you treat two profiles as the same person, look for at least two of these:
One match alone is a lead. Two is reasonable confidence. Three is solid.
For a step-by-step walkthrough with screenshots, the WhatsMyName blog has a guide on finding social media accounts by username. And if the reason you're searching is that someone's using your handle, the process for getting it back is different; start with the free username search guide and then the platform's impersonation form.