What is Slack's security headers grade?

We scan slack.com live for HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy, then assign an A+ to F grade with fix recommendations.

How can I check my own site's security headers?

Use the free Webalert Security Headers Checker to scan any URL and get the same A+ to F grade with per-header recommendations.

Slack Security Headers Report

Live security headers grade for Slack (slack.com). We check HSTS, CSP, X-Frame-Options, and more.

Scanning Slack...

Scan another website → Is Slack down?

Why Slack security headers matter

Security headers tell browsers how to protect visitors on slack.com against clickjacking, MIME sniffing, XSS, and protocol downgrade. A strong grade (A/A+) means the service ships a modern security posture; a weak grade means important protections are missing.

Want the same scan for your own site? Use our free security headers checker, or check whether Slack is currently up on the outage tracker.

Monitor your own site's uptime

Headers protect browsers. Uptime monitoring protects your business. Webalert checks your site every few minutes and alerts you the moment it goes down — free forever.

Start Free Monitoring See the Free Plan

Frequently asked questions

What is Slack's security headers grade?: We scan slack.com live for HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy, then assign an A+ to F grade with fix recommendations.
How can I check my own site's security headers?: Use the free Webalert Security Headers Checker to scan any URL and get the same A+ to F grade with per-header recommendations.