Password Analyser with Entropy Meter
Analyse password strength with entropy calculation, character-set detection, estimated crack time, and pattern warnings — all computed locally, never transmitted.
You don't control software you don't possess
The Security Knife is the answer
Terms change. Features disappear. Accounts get suspended. Servers go down. When you depend on someone else's infrastructure, you depend on their decisions. Sovereign tools. Single HTML files you own. No accounts, no terms, no kill switch.
The Security Knife is a single-file knife with 5 tools that runs entirely in your browser. The Security Knife packages five essential information security utilities into a single HTML file. Analyse password strength with entropy calculations, build CORS headers interactively, decode and inspect JWT tokens, generate Content Security Policy headers, and convert between encoding formats — all running locally in your browser. No data ever leaves your machine.
WHAT'S INSIDE
5 tools in a single HTML file
CORS Header Builder
Build Access-Control headers interactively — select origins, methods, headers, and credentials, then copy the complete header set for your server config.
JWT Decoder & Inspector
Paste a JWT and see the decoded header, payload, and signature. Validates structure, checks expiration, and highlights common security issues.
CSP Generator
Build Content Security Policy headers directive by directive. Preview violations, test against common CDNs, and export as HTTP header or meta tag.
HOW IT WORKS
Three steps. No setup.
1
Download the file
Purchase The Security Knife and download a single HTML file. No installer, no account, no setup.
2
Open in any browser
Double-click to open in Chrome, Firefox, Safari, or Edge. Works on any operating system.
3
Start working
Your data stays in your browser's local storage. Nothing is uploaded. Ever.
COMPLIANCE & GEOGRAPHY
Global
Works in any country. No server dependency, no regional restrictions.
FAQ
Frequently Asked Questions
How does The Security Knife solve the digital sovereignty problem?
The Security Knife runs entirely in your browser. Terms change. Features disappear. Accounts get suspended. Servers go down. When you depend on someone else's infrastructure, you depend on their decisions. Sovereign tools. Single HTML files you own. No accounts, no terms, no kill switch. Password analyser, CORS header builder, JWT decoder, CSP generator, and encoding converter. Security tools that don't phone home — because that would be ironic.
Is my data safe with The Security Knife?
Yes. The Security Knife is a single HTML file. It never connects to any server. Your data stays in your browser's local storage on your device.
What makes The Security Knife different from cloud tools?
Cloud tools require internet, charge subscriptions, and store your data externally. The Security Knife is a one-time purchase ($39), works offline, and never transmits data.
Is The Security Knife really just one file?
Yes. The Security Knife is a single HTML file containing 5 tools. Download it, open it in any browser, and start working. No installation, no dependencies, no accounts.
No cloud One fileOne-time purchase
Get The Security Knife — $39Sovereignty as a Service