Enter their display name, pick Epic Games, PlayStation or Xbox depending on the name you have, and select Check stats. You can switch between lifetime and this season at any time.
The player has turned off public stats. In Fortnite this is under Account and Privacy; once they allow their stats to show, the lookup works.
Solo, duo and squad, plus limited-time modes, as Epic reports them for Battle Royale.
Epic updates them as matches are recorded, so a match you just finished can take a little while to appear. A lookup can also show numbers up to two minutes old, because recent results are cached briefly.
Yes. It is free and needs no account. Visitors who are not logged in complete a quick bot check first.
From the public Battle Royale stats Epic keeps for every account, read through fortnite-api.com. Lifetime covers everything since the account was created; This season covers the current season only.
K/D is kills divided by deaths, and win rate is the share of matches won. Both come straight from Epic, split by mode and by input: keyboard and mouse, controller or touch.
Usually the name is spelled differently or belongs to another account type. Enter the exact display name and pick Epic Games, PlayStation or Xbox to match it. If the player has hidden their stats, the tool says so instead.