How to Tell if a Website Uses Klarna
Identifying whether a website was built with Klarna used to require technical expertise — inspecting source code, tracing network requests in DevTools, and knowing which patterns to look for. Our free scanner automates all of that: it fetches the page, analyzes 2 Klarna-specific signals, and returns a verdict with a confidence score.
You might want to detect Klarna for competitive research, due diligence before acquiring a site, or simple curiosity. Whatever the reason, this page covers every method — automated and manual.
What is Klarna?
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.
It is primarily used for business websites, portfolios, landing pages, and personal sites without coding knowledge.
Visit Klarna official websiteSigns a Website Is Built With Klarna
Our detection engine checks 2 unique Klarna fingerprints. Here are the most reliable signals:
JavaScript / Script Files
Klarna loads specific JavaScript runtime files or loads scripts from identifiable URLs. Checking script src attributes reveals the platform.
x.klarnacdn.netjs.klarna.comHow to Manually Detect Klarna Websites
Method 1 — View Page Source
- Open the website in your browser
- Press
Ctrl+U(Windows) orCmd+Option+U(Mac) - Search (
Ctrl+F) forklarnaorklarna - If found in script src, class names, or meta tags — it's likely Klarna
Method 2 — Browser DevTools Network Tab
- Press
F12to open DevTools - Click the Network tab and reload the page
- Filter by
klarnain the search box - If you see requests to Klarna-specific domains, it's confirmed
How Our Klarna Detector Works
When you submit a URL, our engine fetches the page from its server — just like a browser would — then analyzes the response across 2 Klarna-specific fingerprints:
Script analysis
We scan all loaded JavaScript files for known CDN paths and runtime names
CDN domain matching
We cross-reference every asset request against known platform CDNs
HTML pattern scanning
We search the DOM for platform-specific class names and data attributes
Header inspection
We read HTTP response headers that identify the server or platform
Meta tag extraction
We check generator and other meta tags in the document head
Confidence scoring
We weight each matched signal and normalize to a 0–99% score
How to Build a Similar Website With Klarna
Sign up at https://www.klarna.com, pick a template, customize it with the drag-and-drop editor, add your content, and publish. Most website builders offer free plans to get started.
Other popular website builders include Wix, Squarespace, Webflow, Carrd, and Showit.
Get started with KlarnaFrequently Asked Questions
How can I tell if a website was built with Klarna?
The most reliable ways to detect Klarna are: (1) open DevTools → Network tab and look for requests to Klarna-specific CDN domains, (2) view page source and search for Klarna-specific class names or data attributes, (3) use our free scanner — we check 2 detection signals automatically and return a confidence score.
Is your Klarna detector free?
Yes, completely free. Paste any URL into our scanner and we'll analyze it for Klarna fingerprints immediately. No account required, no limits on scans.
How accurate is the Klarna detection?
We check 2 unique Klarna fingerprint signals across HTML, JavaScript, CDN domains, meta tags, and HTTP headers. Our confidence score reflects how many signals matched — a score above 70% is a strong indicator. We cap accuracy at 99% to reflect that all fingerprint-based detection is probabilistic.
Can Klarna sites be detected if they use a custom domain?
Yes. Custom domains don't hide the underlying platform. The JavaScript files, CDN requests, HTML attributes, and server headers all remain identifiable regardless of the domain name used. Our scanner fetches the page directly and analyzes its technical composition.
What should I do after detecting a Klarna website?
If you want to build something similar, visit https://www.klarna.com to learn more or sign up. If you're doing competitive research, our scan result also shows the full technology stack — including hosting platform, domain age, and other detected technologies. You can share the result link with your team.