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Free Security Tools: Encryption, Passwords & Protection

Discover our free professional security tools to protect your data and strengthen your cybersecurity. Cryptographically strong password generator, password strength tester, hashing tools (MD5, SHA-256), and more. 100% local browser processing, your sensitive data never leaves your device.

7 free tools

Password Generator

Create strong and secure passwords instantly

IP Address Checker

Find your public IP, geolocate any IP and get ISP, ASN, timezone and VPN/proxy detection.

Popular

Security Headers Analyzer

Analyze HTTP security headers of any website: CSP, HSTS, X-Frame-Options and 9 more. A+→F grade with OWASP recommendations.

Phishing Link Checker

Analyze suspicious links to detect phishing: typosquatting, trap domains, hidden redirects. Risk score 0-100.

Text Encryption

Encrypt and decrypt text with Caesar, ROT13, Vigenère, Atbash, Morse, Base64, Binary and Hexadecimal. Brute-force and frequency analysis included.

UUID Generator

Générez des identifiants uniques universels

Vérificateur de mot de passe

Testez la robustesse de vos mots de passe

Why Use Online Security Tools?

Online security tools allow you to strengthen protection of your accounts and data without installing complex software. Our collection of free 2026 security tools covers essential personal and professional cybersecurity needs.

Secure Password Generator

Our password generator creates ultra-secure cryptographically strong passwords: adjustable length (8-64 characters, 16+ recommended for maximum security), character options (uppercase A-Z, lowercase a-z, digits 0-9, symbols !@#$%^&*), ambiguous character exclusion (0/O, 1/l/I), batch generation (up to 100 passwords simultaneously), password strength estimation (weak/medium/strong/very strong), estimated brute force crack time. Uses browser Web Crypto API for cryptographic random generation (CSPRNG). Ideal for: online banking accounts, professional emails, VPN, password managers.

Password Strength Tester

Our robustness analyzer evaluates your existing password strength in real-time: security score 0-100, weakness detection (dictionary, logical sequences 123456, keyboard patterns qwerty), estimated crack time (seconds, minutes, years, centuries), concrete improvement suggestions. Algorithm based on zxcvbn (Dropbox library) which detects: dictionary words (French, English, top 10,000), common dates (1990, 2000), frequent proper names, repetitive patterns (aaaaaa, 121212). A good password must resist minimum 1000 years to brute force attacks with modern hardware (GPU RTX 4090).

Cryptographic Hashing Tools

Our hash generators calculate cryptographic fingerprints of your data: MD5 (128 bits, legacy, not secure for passwords but OK for file checksums), SHA-1 (160 bits, deprecated for crypto but still used Git), SHA-256 (256 bits, current secure standard), SHA-512 (512 bits, maximum security), HMAC (hash with secret key for signatures). Uses: download integrity verification (compare downloaded file hash vs official hash), checksum generation for modification detection, sensitive data anonymization for logs.

Text Encryption and Decryption

Our AES encryption tool protects your sensitive messages: AES-256 algorithm (NSA/military standard), CBC mode (Cipher Block Chaining) with random IV, symmetric encryption (same key for encrypt/decrypt), base64 export for email/chat transmission. WARNING: this tool is designed to protect personal notes, not ultra-sensitive communications. For critical professional exchanges, use dedicated solutions (Signal, PGP, ProtonMail). Encryption key must be transmitted via separate channel (phone, in person).

Absolute Security and Privacy

CRITICAL: all our security tools work with 100% local processing (client-side) via JavaScript and native browser Web Crypto API. YOUR PASSWORDS AND SENSITIVE DATA ARE NEVER transmitted to our servers. Complete processing (generation, hashing, encryption) happens on your computer/smartphone. You can verify in browser developer tools (F12 > Network): zero HTTP requests containing your data. You can even use tools offline once the page is loaded. Maximum GDPR compliance: zero security data collection.

Frequently Asked Questions

Yes, our generator uses the Web Crypto API native to the browser (window.crypto.getRandomValues) which provides cryptographically strong random numbers (CSPRNG - Cryptographically Secure Pseudo-Random Number Generator). This is the same technology used by professional password managers (Bitwarden, 1Password). A 16-character password with uppercase + lowercase + digits + symbols has about 10^30 possible combinations, meaning billions of years of brute force cracking even with modern supercomputers (calculation: 95^16 combinations / 100 billion tests/second GPU). CRITICAL: security also depends on storage - NEVER write generated passwords on paper or unencrypted text file. Use an encrypted password manager (free Bitwarden, 1Password, KeePass).

NO, absolutely NEVER. This is the fundamental difference with questionable online services. All our security tools work 100% locally in your browser via JavaScript and the HTML5 Web Crypto API. When you generate or test a password: everything runs in your device's RAM, no network request is made with your sensitive data, you can verify in F12 > Network: zero transmission, you can even use tools offline (airplane mode). As proof: our JavaScript source code is visible (right-click > Inspect > Sources) and you'll see total absence of server calls with your data. GOLDEN RULE: NEVER trust an online tool that asks you to enter your real password without being able to verify the source code.

The best password depends on usage. For critical accounts (bank, main email, master password manager): 20+ random characters with all character types (generated by our tool), stored ONLY in encrypted manager, 2FA/MFA authentication enabled (Google Authenticator, SMS, hardware key). For secondary accounts: 16+ random characters OK, always via manager. ALTERNATIVE: memorable passphrase Diceware type: 'horse-battery-staple-correct' (5-7 random words separated hyphens/spaces, ~50 characters, entropy equivalent 16 random characters). ABSOLUTELY AVOID: dictionary words alone, birth dates, family names, keyboard patterns (azerty123, qwerty), same password reuse across multiple sites (breach cascade risk).

Cryptographic hashing transforms any data into a unique fixed-size digital fingerprint, impossible to reverse (one-way function). Legitimate uses: (1) Downloaded file integrity verification: you download Ubuntu ISO 4 GB, official site displays 'SHA-256: abc123...', you hash your downloaded file with our tool, if identical hash = authentic uncorrupted/unmodified file. (2) Modification detection: hashing contractual/legal documents to prove they haven't been altered. (3) Log anonymization: hash email/IP addresses in server logs for statistical analyses without exposing personal data (GDPR compliance). WHAT NOT TO DO: hash passwords for storage (MD5/SHA are crackable by rainbow tables - use bcrypt/Argon2 with salt).

Recommended multi-layer protection: (1) Strong unique passwords: randomly generated 16+ characters, different one per account (avoids domino effect if breach), stored in encrypted manager (free Bitwarden). (2) 2FA/MFA authentication: enabled on ALL critical accounts (bank, email, social networks), prefer authenticator app (Authy, Google Authenticator) over SMS (SIM swapping risk). (3) Breach monitoring: sign up on haveibeenpwned.com for alerts if your emails/passwords leaked in breaches. (4) Updates: OS + browser + antivirus always up to date (critical security patches). (5) Phishing caution: verify URLs before clicking (real banking sites never by email), never give password by email/phone.

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Last updated: March 12, 2026
Created on: January 20, 2024