Security
Encrypt a file, hash it, or see what a public page exposes.

Page: /category/security
Text: /category/security.txt

What this category does
- Encrypt a file or a folder with a passcode you choose.
- Compute a SHA-256 checksum.
- Show your IP, compare two public DNS resolvers, and read a browser fingerprint.
- Look up a site’s Mozilla Observatory header grade.

Tools
- Encrypt a file: Choose files or a folder, set a password, and download the encrypted files plus a key that must stay in the same folder. (/tools/file-encrypt.txt)
- SHA-256 checksum: Hash a local file so you can compare it to a published checksum. (/tools/file-checksum.txt)
- Website security check: Look up a public site’s Mozilla Observatory grade for security headers. It is not a trust or scam score. (/tools/website-security-check.txt)
- What's my IP: Show the public IP address seen for this browser and a city-level location guess. (/tools/my-ip.txt)
- Is my DNS misconfigured?: Compare Cloudflare and Google public DNS for a name you type. Your computer's resolver is not visible to a web page. (/tools/dns-check.txt)
- What's my browser fingerprint?: List the screen size, fonts, browser, and device details this page can already see. Nothing is uploaded. (/tools/browser-fingerprint.txt)