Free VPN Compatibility Tester
Bring together browser connection signals, observed addresses, available DNS evidence and measured transfer performance.
Run connection checks
Check browser WebRTC support, observed addresses, DNS resolver observations where available, and actual HTTP transfer performance.
How to use this tool
Follow these steps to get observations you can interpret and act on.
Record a baseline if useful
Save a baseline before connecting your VPN if you want to compare addresses and transfer performance.
Connect and run the checks
Let your VPN finish connecting, then run the combined connection checks in the browser you want to troubleshoot.
Follow the relevant evidence
Compare public addresses and transfer results. Verify application-specific settings, such as a kill switch, directly in the VPN client.
How the VPN compatibility tester works
This combined connection check helps you investigate browser behavior while a VPN is connected. It collects available WebRTC and address observations, then measures actual HTTP transfers instead of guessing whether individual services will work.
These measurements help diagnose a connection. They do not automatically identify your VPN, kill switch, port-forwarding support, or subscription-service compatibility.
Understanding your results
- Browser WebRTC support indicates a browser capability, not a VPN security certification.
- Observed public addresses apply to the tested requests. A VPN can route browsers and other applications differently.
- Kill switch behavior, P2P support, port forwarding and subscription-service access cannot be inferred from these browser signals.
Privacy & important limitations
- The WebRTC observation uses the configured STUN server, Google’s public service by default, without requesting camera or microphone access.
- Performance checks use about 3 MB per run. DNS observation requires an available authoritative probe; missing coverage stays inconclusive.
Measured findings include their source and scope. An unavailable check is never counted as a pass, a threat or a score.
Frequently asked questions
Can this tell me which VPN I am using?
The observations may describe an exit network, but they do not reliably identify your VPN provider, account or subscription features.
How do I check a particular application?
Open that application while connected to your VPN and verify its actual behavior. Use this combined check to narrow down browser and connection issues first.