UploadThing is a file-upload infrastructure product built specifically for the modern TypeScript/Next.js ecosystem, giving developers a hosted upload API and CDN without wiring up S3 or a custom upload server themselves — popular in the indie-hacker and small-SaaS community building on Next.js. Our engine detects it through 1 script pattern, 2 HTML patterns, and 1 CDN domain tied to its client SDK and asset-delivery infrastructure. Documented at uploadthing.com.
Detect Uploadthing Websites — Free Tool
Enter any URL to check if it was built with Uploadthing. Instant results, no account required.
How we detect Uploadthing — see our methodology: AI Influence Score calculation, evidence tiers, and fingerprint signal types.
How to Detect Uploadthing Websites
Script Patterns
1 patterns
CDN Domains
1 patterns
HTML Patterns
2 patterns
1. Check the Page Source
Open the website in your browser, right-click, and select "View Page Source". Search for uploadthing-specific patterns in the HTML.
2. Look for Script Files
Check the Network tab in DevTools for JavaScript files loaded from Uploadthing domains.
3. Check CDN Domains
Network requests to these CDN domains indicate a Uploadthing site:
utfs\.io4. Use AI Website Detector (Easiest)
Our automated scanner checks all these signals at once and gives you an instant confidence score. Just enter any URL above.
Frequently Asked Questions
Is this website built with Uploadthing?
You can detect if any website was built with Uploadthing by using our free scanner above. Just enter the URL and we'll analyze HTML patterns, JavaScript files, CDN domains, and HTTP headers to determine if Uploadthing was used — with a confidence score.
How to detect if a website was built with Uploadthing?
There are several ways to detect Uploadthing: (1) View the page source and look for Uploadthing-specific class names or script URLs, (2) Check the Network tab in DevTools for requests to Uploadthing CDN domains, (3) Use our free tool — we check 4 detection signals automatically.
What websites are built with Uploadthing?
Uploadthing is used by thousands of websites worldwide. Our scanner has detected many Uploadthing-built sites across different industries. You can scan any URL to check if it uses Uploadthing.
How accurate is the Uploadthing detection?
Our Uploadthing detection engine checks 4 unique fingerprint signals, achieving high confidence results. We score each match and return a confidence percentage so you know how certain the detection is.
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Detection Info
- Category
- Storage
- Signals Used
- 4 patterns
- Accuracy
- High
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