Free ad blocker test for browsers, extensions, VPNs and DNS filters. Check uBlock Origin, AdGuard, Pi-hole or NextDNS against 128 ad and tracker hosts in one click.

Check server: website monitoring with useful tools, Check IP, Check website

DNSleaktest.com offers a simple test to determine if you DNS requests are being leaked which may represent a critical privacy threat. The test takes only a few seconds and we show you how you can simply fix the problem.

Free, privacy-first developer tools running in your browser. JSON formatter, image optimizer, SVG studio and more. Your data stays local.

Convert bookmarklet to Chrome extension

Run a free ad blocker test to check whether your browser extension, VPN, DNS filter, or built-in blocker stops ads, trackers, analytics scripts, social tracking, and known ad domains.

A comprehensive free SSL test for your public web servers.