Updated 28 December 2025.
Web Browsers
To understand if your current browser implements Post Quantum Cryptography (PQC) and is quantum safe, visit this Cloudflare page. You should hopefully see a message like “You are using X25519MLKEM768 which is post-quantum secure” or “You are using X25519Kyber768Draft00 which is post-quantum secure” (if the browser uses a pre-standards version of PQC). Note that you are secure only if the other end also implements PQC as well.
If you aren’t seeing that message, you may need to turn on the PQC feature in your browser. Evertrust has some instructions on how to do this.
All modern browsers support it right now. If you’re running an older version of a browser, you can check whether you need to update to one of the following minimum version with PQC support:
- Google Chrome – pre-standards support from v116, and standards-compliant support from v131.
- Apple Safari – v26 supports standards-compliant PQC, but only when running on at least v26 of an Apple device OS, such as iOS 26 or MacOS 26 Tahoe.
- Brave – pre-standards support from v1.57, and standards-compliant support from v1.73. (Based on Chromium versions aligned to Google Chrome above.)
- Microsoft Edge – pre-standards support from v124, standards-compliant support from v131.
- Mozilla Firefox – pre-standards support from v124, standards-compliant support from v132 for HTTPS connections, and standards-compliant support from v135 that also includes QUIC or HTTP/3 connections by default.
- Opera – pre-standards support from v102., and standards-compliant support from v116.0.5356.0. (Based on Chromium versions aligned to Google Chrome above.)
Applications
A number of applications have announced that they are quantum safe, these include:
- Apple iMessage – supported from iOS v17.4 and macOS v.14.4.
- Signal – supported from September 2023 versions.
- Zoom Meetings – supported in the app from v6.0.10 (or Zoom Rooms from v6.10).
Note that, for messaging applications, generally all parties to a conversation need to have the supported version of the application for any party to be quantum safe.
Many applications rely on using the cryptographic support provided by the underlying operating system rather than including their own cryptography libraries. Currently Apple operating systems (iOS, macOS, etc.) from v26 onwards support PQC, and Windows 11 updates from November 2025 onwards can support PQC. Android has not yet released native PQC support.
Please let me know if there are common applications that support PQC that I should add to this list.