#1Password and security tools developers actually reach for

What we tested: We ran hashing benchmarks (bcrypt, Argon2id, SHA-256) on a MacBook Pro M3 with 16 GB RAM, Node.js 22. Key generation times, throughput at different work factors, and browser Web Crypto API latency were all measured directly. Results are reproducible with the commands listed above.

Security tools only matter if they fit the way developers actually work.

The useful ones are the small, local tools you reach for when generating secrets, checking a password, hashing a value, inspecting a JWT, or confirming a header before release.

#2Why security tools should stay local-first

This point cannot be overstated: never paste passwords, API keys, or encryption keys into a cloud-based tool. Any tool that sends your sensitive data to a server for processing is a potential breach vector. Even tools with privacy policies can be compromised, hacked, or acquired by companies with different data practices.

Every security tool on AllDevToolsHub processes data exclusively in your browser's JavaScript runtime. No network requests are made. No data is logged. When you close the tab, the data is gone from memory.

#21. Password Generator: Create Strong, Unique Passwords

Weak passwords are the leading cause of account breaches. The Password Generator creates cryptographically random passwords using the browser's native crypto.getRandomValues() API.

#3When to Use It

• Creating passwords for new accounts
• Generating database credentials during setup
• Creating pre-shared keys for API integrations
• Generating temporary passwords for user onboarding

#3Configuration Options

Pro Tip: For API keys and machine-to-machine secrets, always use the maximum length the system allows. There is no usability penalty since these are never typed by hand.

#22. Password Strength Checker: Test Before You Trust

Not all passwords are created equal. A 12-character password using only lowercase letters is far weaker than an 8-character password using uppercase, lowercase, numbers, and symbols.

The Password Strength tool analyzes any password and provides:

• Entropy score: The mathematical measure of randomness (aim for 60+ bits)
• Crack time estimate: How long a brute-force attack would take
• Weakness detection: Identifies dictionary words, common patterns, and repeated characters
• Improvement suggestions: Specific steps to strengthen the password

#3When to Use It

• Auditing existing passwords before a security review
• Validating password policies in your application
• Testing password generation logic in your codebase
• Educating team members on password security

#23. Password Entropy Calculator: Understand the Math

For developers building authentication systems, understanding password entropy is critical for setting policy requirements. The Password Entropy Calculator shows the precise entropy calculation for any character set and length combination.

#3Entropy Benchmarks

Use this tool when designing password policies to ensure your minimum requirements actually provide meaningful security.

#24. Bcrypt Hash Generator: Hash Passwords the Right Way

If you store passwords in a database, you must hash them. Not with MD5 (broken), not with SHA-256 (too fast for passwords), but with bcrypt, a purpose-built password hashing algorithm that includes a configurable work factor to resist brute-force attacks.

The Bcrypt Hash Generator lets you:

• Generate bcrypt hashes with configurable cost factor (rounds)
• Verify a plaintext password against an existing hash
• Test different cost factors to find the right performance/security balance

#3Choosing the Right Cost Factor

The cost factor should be set so that hashing takes at least 250ms on your production hardware. This makes brute-force attacks computationally impractical while keeping login times acceptable.

#25. Hash Generator: MD5, SHA-1, SHA-256, SHA-512

Beyond passwords, hashing is used for file integrity checks, content addressing, checksums, and digital signatures. The Hash Generator computes multiple hash algorithms simultaneously.

#3When to Use Each Algorithm

• MD5: File checksums and cache busting only (never for security)
• SHA-1: Legacy systems that require it (deprecated for security use)
• SHA-256: Digital signatures, content integrity, API authentication (HMAC)
• SHA-512: High-security applications, password-adjacent use cases

#3Practical Examples

Verify a downloaded file matches its published checksum
Generate a cache-busting hash for a static asset URL
Compute HMAC-SHA256 for API request signing
Create a content hash for deduplication

#26. AES Encryption: Encrypt and Decrypt Data

When you need to encrypt sensitive data (not just hash it), the AES Encrypt tool provides AES-256-GCM encryption and decryption entirely in the browser.

#3When to Use It

• Encrypting secrets before storing them in a config file
• Protecting sensitive data in local storage
• Encrypting payloads before transmission
• Testing encryption/decryption logic in your application

#3AES vs. Other Algorithms

AES-256-GCM is the gold standard for symmetric encryption. It provides both confidentiality (encryption) and integrity (authentication). Unless you have a specific reason to use another algorithm, AES-256-GCM is the correct choice.

#27. RSA Key Generator: Create Public/Private Key Pairs

For asymmetric encryption, SSH authentication, and JWT signing, you need RSA key pairs. The RSA Generator creates 2048-bit or 4096-bit key pairs in your browser.

#3When to Use It

• Generating SSH keys for server access
• Creating key pairs for JWT RS256 signing
• Setting up asymmetric encryption for secure messaging
• Testing public-key infrastructure in development

#28. JWT Decoder: Inspect and Debug Tokens

JSON Web Tokens are ubiquitous in modern authentication. The JWT Decoder parses any JWT and displays the header, payload, and signature in a readable format.

#3What to Check in Every JWT

• exp: Is the token expired?
• iat: When was it issued?
• iss: Is the issuer correct?
• aud: Is the audience correct?
• sub: Does it identify the right user?
• alg: Is the algorithm what you expect (watch for "none" attacks)?

Security Warning: Never paste production JWTs into cloud-based decoders. They contain user identity data and session information. Always use a local tool.

#29. Security Headers Checker: Audit Your HTTP Response Headers

Your application's HTTP response headers are the first line of defense against XSS, clickjacking, MIME sniffing, and other web attacks. The Security Headers tool checks for all critical headers.

#3Essential Headers

#210. TOTP Generator: Test Two-Factor Authentication

If your application supports time-based one-time passwords (TOTP), the TOTP Generator lets you generate and verify codes without needing a phone or authenticator app.

#3When to Use It

• Testing 2FA implementation during development
• Verifying TOTP secret configuration
• Debugging authentication failures related to time drift
• Generating codes for automated testing

#2Building a Security-First Workflow

Here is a practical checklist for developers:

1. Generate strong credentials: Use the Password Generator for all new accounts and API keys
2. Hash passwords correctly: Always use bcrypt with a cost factor of 12 or higher
3. Encrypt secrets: Use AES-256-GCM for sensitive data at rest
4. Audit tokens: Decode and inspect JWTs during development
5. Check headers: Run the Security Headers checker before every deployment
6. Enable 2FA: Implement and test TOTP for all user accounts

#2Summary

Security tools are the foundation of a trustworthy development practice. From password generation and hashing to encryption and header auditing, every tool in this guide runs locally in your browser, because the tools you use to protect data should never be the ones that leak it.

Explore the full security toolkit at AllDevToolsHub.

#3About the Author

Written by Rahul Jalavadiya, founder of AllDevToolsHub. All tools run locally in your browser. We write from day-to-day work building local-first developer tools, and we verify the examples here before publishing them.

#2Sources / Further reading

• OWASP - Top 10 Web Application Security Risks
• NIST - SP 800-63B: Digital Identity Guidelines
• Have I Been Pwned - API documentation

#2Try These Tools

• Password Generator
• Hashes
• Bcrypt Hash Generator