Security & QA
Random String Generator (Alphanumeric, Passwords & Secrets)
Generate cryptographically strong random strings, API secrets, and QA stress testing tokens with custom character sets and entropy calculations.
Open ToolRandom Password Generator – Strong & Secure Password Creator
Generate strong, uncrackable random passwords with custom symbols, numbers, and NIST-compliant entropy ratings. 100% secure client-side Web Crypto PRNG.
.3RPthB)&7>-INc*Password Strength: Strong
Secure against modern brute-force crackingTime to Crack (Brute-Force GPU RTX 4090): ~3.4 million years (NIST 800-63B)
~103.6 bits entropyQuick Security Presets:
16 chars
⚡ Automated Credential Pipeline
Automate Password Generation to Secure Account Provisioning
Generate thousands of secure passwords, store credentials encrypted in variables, and automate user provisioning.
How to Generate Uncrackable Passwords
1
Set Password Length
Use the slider to select a length between 8 and 64 characters (16+ characters recommended for high security).
2
Configure Character Rules
Toggle uppercase, lowercase, numbers, symbols, and optionally avoid ambiguous characters (l, 1, I, o, 0, O).
3
Check Strength & Copy
Review the visual strength meter and click Copy to immediately copy the generated password to your clipboard.
Key Features of Random Password Generator
Web Crypto PRNG
Harnesses window.crypto.getRandomValues for unbiased, hardware-seeded cryptographic randomness.
Live Strength Meter
Instant visual feedback on password complexity rating from Weak to Military-Grade Very Strong.
Avoid Ambiguous Chars
Prevents eye strain and transcription errors by excluding confusing characters like 0, O, 1, and l.
Bulk Password Lists
Generate single master passwords or bulk batches of 10 to 50 passwords for test credential seeding.
Password Complexity vs. GPU Brute-Force Cracking Time (RTX 4090 Array)
Empirical brute-force resistance benchmarks based on NIST 800-63B entropy calculations and modern hashcat multi-GPU rigs.
| Password Type & Length | Character Pool Space | Entropy (Bits) | Time to Crack (8x RTX 4090 Hashcat) | Security Rating (NIST 800-63B) |
|---|---|---|---|---|
| 8 Chars (Numbers only - PIN) | 10⁸ (100 Million) | ~26.6 bits | Instant (< 1 ms) | Very Weak (Insecure) |
| 12 Chars (Letters + Numbers) | 62¹² (3.22 × 10²¹) | ~71.5 bits | ~3.2 Hours | Medium (Basic Defense) |
| 16 Chars (Full Upper, Lower, Numbers, Symbols) | 94¹⁶ (3.71 × 10³¹) | ~104.9 bits | ~3.4 Million Years | Strong (Enterprise Grade) |
| 32 Chars (Military-Grade / Air-gapped) | 94³² (1.38 × 10⁶³) | ~209.8 bits | Trillions of Millennia | Ultra Secure (Air-gapped Systems) |
Frequently Asked Questions
Clear answers about using this tool and automating workflows with RunMacro.
How long does it take an RTX 4090 GPU array to crack a 16-character password?
A 16-character password using uppercase, lowercase, numbers, and symbols contains ~104.9 bits of entropy and 94¹⁶ (3.71 × 10³¹) possible combinations. Modern multi-GPU arrays (such as 8x RTX 4090 rigs) testing billions of hashes per second would still require approximately 3.4 million years of continuous brute-force computing to crack it.
What makes a password strong according to NIST Special Publication 800-63B?
NIST 800-63B guidelines emphasize length over complex arbitrary rules. Passwords with 16+ characters offer exponential resistance against brute-force attacks compared to short 8-character passwords, even if the short ones contain complex symbols.
Is it safe to generate sensitive passwords in an online web browser?
Yes, on RunMacro it is 100% secure. Our generator runs entirely client-side using your browser's native window.crypto.getRandomValues PRNG engine. Zero network requests are sent, zero passwords are saved, and nothing is transmitted to any cloud or database.
How can RunMacro automate password entry and credential workflows?
RunMacro allows enterprise and individual users to securely automate application logins, credential rotations, and form authentications across desktop and web software without exposing plaintext passwords to clipboard eavesdroppers.
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