Check a website for data-protection measures with Webbkoll, a privacy analysis tool run by the 5th of July Foundation.
Blacklight
Inspect a website’s privacy practices in real time with Blacklight, a website privacy inspector.
About Blacklight
Blacklight is a web-based privacy inspector from The Markup. It is described as a real-time website privacy inspector that shows who may observe activity during work, video watching, learning, and shopping online.
To use it, you enter the address of any website. Blacklight scans the site and reports the specific user-tracking technologies found and which parties receive the data. A scan normally takes between 30 seconds and one minute to finish all tests.
The reports cover ad trackers, third-party cookies, browser identification that evades cookie blockers, session-monitoring scripts, keystroke capturing before submit, and data sent to Facebook, TikTok, Twitter/X, and Google for advertising. The site also links to related reporting on findings from Blacklight scans. It suits general readers, researchers, and site operators who want to check tracking on a specific site.
Key features
- Enter any website address to start a privacy scan
- Detect ad trackers sending user data to advertisers
- Check for third-party tracking cookies across the web
- Detect browser identification that evades cookie blockers
- Find session-monitoring and keystroke-capturing scripts
- Show data sharing with Facebook, TikTok, Twitter/X, Google
Best for: People who want to check what tracking technologies a specific website uses.
Good for
- Scans any website address entered by the user
- Reports specific trackers and data recipients
- Covers multiple tracking types in one test
- Results normally ready in 30 seconds to one minute
Blacklight at a glance
- Website
- themarkup.org/blacklight
- Category
- Privacy & Security › Website & URL Scanners
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Blacklight FAQ
What is Blacklight?
Blacklight is a real-time website privacy inspector from The Markup that scans a website address and lists tracking technologies and data recipients.
How do I use Blacklight?
Enter a website address on the page to start a scan, which normally takes between 30 seconds and one minute to finish.
What types of tracking does Blacklight check?
It checks ad trackers, third-party cookies, browser identification, session-monitoring scripts, keystroke capturing, and data sent to Facebook, TikTok, Twitter/X, and Google.
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