Klarna is a Swedish buy-now-pay-later (BNPL) and payments platform widely adopted by e-commerce merchants and retail brands seeking to offer flexible installment financing at checkout. Websites integrating Klarna typically embed its JavaScript SDK directly from Klarna's hosted infrastructure, and our detection engine identifies these integrations through two distinct script patterns associated with Klarna's client-side loader and on-site messaging components. These script signatures — commonly referencing domains such as `js.klarna.com` or similar Klarna-controlled CDN endpoints — provide reliable, low-ambiguity signals that distinguish genuine Klarna implementations from superficially similar payment widgets. Because Klarna is loaded dynamically at checkout rather than embedded in static HTML, its detection relies heavily on runtime script analysis rather than passive markup inspection, which makes pattern-based fingerprinting the most robust approach. Klarna operates as a third-party SaaS platform with no self-hosted option, meaning every detected instance reflects a live merchant integration billed through Klarna's commercial agreements — a characteristic that makes its presence a strong indicator of active transactional e-commerce functionality on the scanned site.
Paste any URL to instantly detect whether it was built with Klarna. Our engine checks 2 technical signals.
Klarna is used across many industries. These are the most common website types built on this platform:
Businesses of all sizes
Fast, reliable site building with professional results
Designers and developers
Powerful tools with minimal setup
Startups
Quick launch with scalable infrastructure
Content creators
Beautiful presentation for your work
Every Klarna website leaves distinctive technical fingerprints. Here's what to look for:
JavaScript Patterns
2 script patterns linked to Klarna
Explore how Klarna compares to similar payment tools: