Whenever you connect with a program to an Internet resource, a web browser to a website for instance, information are revealed to the server hosting the resource.
That’s automatic, and often not the only thing happening. If that site loads resources from other servers, they too gain information, and depending on what is running on the site and supported by the browser, additional information may be revealed.
Usually, information such as your computer’s IP address, a user agent that reveals browser, operating system and language, and a handful of other information are revealed automatically during connections.
While there are methods available to hide or block certain information from being made known to sites you connect to, there are also methods that sites can use to find out more about you.
Online Privacy Test Resource List
Online privacy tests help you find out what kind of information your browser (or other programs) reveal. The information itself is useful, but you can also act upon it, for instance by disabling certain features in the program you are using if you don’t require them.
You find two listings below. The basic tests listing contains resources that perform simple tests (usually one) only while the advanced tests listing resources that run a series of tests.
|Bad SSL||Tests how the browser handles certain SSL certificates and other SSL-types||https://badssl.com/|
|Battery Status API||Tests the status of the battery||https://pstadler.sh/battery.js/|
|BrowserRecon||Fingerprinting test based on user agent||https://www.computec.ch/projekte/browserrecon/?s=scan|
|Browser Referer Headers||Browser referer headers test suite.||https://www.darklaunch.com/tools/test-referer|
|Canvas Fingerprinting||Checks whether Canvas can be used to fingerprint the browser||https://www.browserleaks.com/canvas|
|Content Filters and Proxy Test||Tests network filters, TOR browser and local content filters||https://www.browserleaks.com/proxy|
|DNS Leak Test||Tests whether your IP address is leaked by DNS||https://www.dnsleaktest.com/|
|DNS Spoofability Test||Comprehensive analysis of DNS resolving nameservers||https://www.grc.com/dns/dns.htm|
|Do Not Track||Detects support for Do Not Track||https://www.browserleaks.com/donottrack|
|Email IP Leak||Finds out whether your email provider leaks your IP address||https://emailipleak.com/|
|Email Privacy Tester||Tests whether your email client leaks back information to the sender of an email||https://emailprivacytester.com/|
|Evercookie Test||Checks if persistent data can be saved to the local user system.||https://samy.pl/evercookie/|
|Firefox Addon Detector||Checks if certain Firefox add-ons are installed||https://thehackerblog.com/addon_scanner/|
|Flash Player System Test||Lists information about Flash Player||https://www.browserleaks.com/flash|
|Flash Player Test||Checks whether Adobe Flash Player is installed||https://www.adobe.com/software/flash/about/|
|How’s My SSL||Checks SSL support and provides a rating||https://www.howsmyssl.com/|
|HTML5 Features Detection||Checks HTML5 capabilities||https://www.browserleaks.com/modernizr|
|HTML5 Geolocation Test||Tries to look up your location in the world||https://www.browserleaks.com/geo|
|HTML5 Test||Tests the browsers HTML5 capabilities||https://html5test.com/|
|Java Test||Tests whether Java is installed||https://www.java.com/en/download/installed.jsp|
|Mozilla Plugin Check||Checks which plugins are installed in the Firefox web browser||https://www.mozilla.org/en-US/plugincheck/|
|Popup Blocking Tests||Tests how well your browser handles (blocks) popups||https://www.kephyr.com/popupkillertest/index.html|
|RC4 Fallback Test||Runs a Fallback Vulnerability test||https://rc4.io/|
|Redirect test page||Run a series of redirect tests to find out how your browser handles those||https://jigsaw.w3.org/HTTP/300/Overview.html|
|Silverlight Test||Reveals information about Silverlight||https://www.browserleaks.com/silverlight|
|SSL Check||Reveals the SSL cipher used to connect to the website||https://www.fortify.net/sslcheck.html|
|SSL Cipher Suite Details||Lists all cipher suites supported by the browser||https://cc.dcsec.uni-hannover.de/|
|System Fonts Detection||Uses CSS+JS, Flash, Silverlight or Java to detect fonts||https://www.browserleaks.com/fonts|
|The Joys of HTML||Tests whether sites can fill your hard drive with data||https://www.filldisk.com/|
|Universal Plug n’Play (UPnP) Internet Exposure Test||Tests whether your computer rejects UPnP probes||https://www.grc.com/x/ne.dll?rh1dkyd2|
|WebRTC Leak Test||Tests whether local or public IP addresses are leaked||https://www.perfect-privacy.com/webrtc-leaktest/|
|WebRTC Test||Tests WebRTC capabilities||https://test.webrtc.org/|
|Whois Test||Reveals IP address, host name, IP address location information and other IP related information||https://www.browserleaks.com/whois|
|Weak Diffie-Hellman and the Logjam Attack||Tests whether your browser is vulnerable to the Logjam attack||https://weakdh.org/|
|Am I Unique||Tests whether the browser is unique by checking the following information: User-agent, Accept, Content Encoding, Content Language, List of Plugins, Platform, Cookies, Do Not Track, Timezone, Screen Resolution, Use of local storage, Use of session storage, Canvas, WebGL, Fonts, Screen resolution, Language, Platform, Use of Adblock||https://amiunique.org/fp|
|Cross Browser Fingerprinting Test||Tests locality, operating system, screen resolution, time zone, User Agent string, HTTP Accept, Plugins, Fonts||https://fingerprint.pet-portal.eu/#|
|IP Lookup||Checks IP address, browser user agent, referer||https://www.ghacks.net/ip/|
|Jondonym Full Anonymity Test||Tests IP, location, net provider, Reverse DNS, Cookies, Authentication, Cache (E-Tags), HTTP Session, Referer, Signature, User-Agent, SSL Session ID, Language, Content Types, Encoding, Do Not Track, Upgrade-Insecure-Requests||https://ip-check.info/?lang=en|
|Panopticlick||Tests Supercookies, Canvas Fingerprinting, Screen size and color depth, browser plugins, time zone, DNT header, HTTP Accept headers, WebGL fingerprinting, language, system fonts, platform, user agent, touch support and cookies||https://panopticlick.eff.org/|
|Privacy Analyzer||A whole battery of tests including: Stealth Test, Browser Test, Trojans Test, Advanced Port Scanner, Exploits Test, PC Flank Leaktest||https://www.privacy.net|
|Onion Leak Test||For CORS and WebSocket Requests||https://cure53.de/leak/onion.php|