Security
Client-side privacy tools, device hardening checklists, and small-business security readiness assessments that never send your input anywhere.
No sign-up. No data leaves your browser. Updated 2026.
Each tool includes a worked methodology, assumptions, and common pitfalls below the numbers.
Select your web application requirements to generate copy-paste HTTP response security headers with explanations of CSP directives and HSTS preloading.
Open calculator → Password securityMeasure the entropy of a password or passphrase, compare crack times across realistic attacker guess rates, and generate a random multi-word passphrase locally.
Open calculator → SMB complianceScore your organization across MFA enforcement, immutable backups, endpoint detection, and staff phishing defense to identify security gaps and estimate breach financial risk.
Open calculator →Practical walkthroughs with the math shown, not just conclusions.
How SMBs can implement modern Zero Trust Network Access (ZTNA) to grant least-privilege access without cumbersome legacy VPNs.
Read the guide →How SIM swapping works, how attackers bypass SMS two-factor authentication, and step-by-step instructions to set carrier account lock PINs.
Read the guide →How to segment smart home IoT gadgets from corporate work computers using VLANs and guest Wi-Fi networks.
Read the guide →How passkeys work under the hood with public-key cryptography, why they are immune to phishing, and how to migrate your organization.
Read the guide →A practical guide to deploying a strict Content Security Policy using nonces or hashes to eliminate Cross-Site Scripting (XSS).
Read the guide →How botnets execute credential stuffing attacks using breached password dumps, and defensive steps to detect and mitigate automated login fraud.
Read the guide →Step-by-step defensive checklists for operating systems, browsers, and workplace tools, with the settings that matter most.
Every calculator on LockdownGuide is deterministic: the same inputs always produce the same output, and the formula is documented in plain language on the tool page. Where a figure depends on an external benchmark — a published rate, a statutory limit, or an industry cost range — the page cites the publisher and links to it.
We separate inputs you control (balances, rates, dimensions, weights) from assumptions we supply (default rates, waste factors, contingency percentages). Assumption defaults are deliberately conservative and every one of them is editable on the tool page, so you can substitute your own quote or local figure.
Nothing you type is transmitted. The calculations execute in JavaScript in your browser, which means the tools work offline and no personal data is collected.