Introduction:
Password strength reflects how hard it is for an attacker to guess or brute-force a secret string that guards your accounts, devices, or documents; longer, unpredictable combinations raise difficulty exponentially, discouraging automated cracking attempts without increasing your workload.
This tool creates random passwords on demand, then evaluates each candidate with a client-side strength engine that estimates entropy, expected crack time, and visualises progress so you can balance security against memorability before adopting the result.
You might generate a new passphrase when onboarding to a service, rotating credentials at work, or hardening a personal vault—*always store the output in a safe place and never reuse old secrets across multiple accounts*
Technical Details:
The generator runs entirely in the browser, relying on the Web Crypto API for high-quality randomness, a lightweight strength estimation engine for instant feedback, and progressive enhancement to ensure accessibility without external dependencies or network calls.
Custom Length Control
Specify any value between 1 – 100 characters; the interface validates input and recalculates entropy dynamically.
Character Set Filters
Toggle uppercase, lowercase, numbers, symbols, and ambiguous exclusions to tailor complexity and readability.
Real-Time Strength Meter
A colour-coded progress bar maps entropy to a four-point score, giving clear visual guidance before adoption.
Entropy & Crack-Time Estimate
The engine converts symbol space into bits of entropy and projects offline cracking duration for transparent risk assessment.
Offline Operation
No data leaves your device; generation, analysis, history, and downloads occur locally to protect privacy.
Step-by-Step Guide:
- Enter the desired Length value.
- Click the Characters toggle to reveal options.
- Select Uppercase, Lowercase, Number, or Symbol checkboxes.
- Enable Exclude ambiguous optional or Unique characters for extra clarity.
- Press Regenerate to create a password and review strength indicators.
- Use Copy or Download TXT to save, and browse History or Stats tabs for reference.
FAQ:
Is my data stored?
No. Everything runs in your browser; nothing is transmitted or saved on our servers.
How is strength measured?
The estimator compares character diversity and length against common patterns to calculate entropy and assigns a score from 0–4.
Can I choose which characters appear?
Yes. Enable or disable specific sets in the Characters panel before regenerating the password.
What does entropy mean?
Entropy counts the randomness expressed in bits; higher values indicate more possible combinations and stronger protection.
Why avoid ambiguous symbols?
Characters like “O” and “0” can be misread; excluding them reduces transcription errors without severely weakening security.
Troubleshooting:
- Copy button does nothing—your browser may block clipboard access; refresh permissions or try manual selection.
- Progress bar stays grey—at least one character category must remain enabled to compute strength.
- Entropy shows “0 bits”—set length above one character and regenerate.
- Downloaded file is empty—ensure you regenerated the password after adjusting options.
- History list lost—clearing browser storage or using private mode resets previous entries automatically.
Advanced Tips:
- Set length above 16 characters for services that allow long passphrases.
- Combine unique characters with symbol inclusion to counter rainbow-table attacks.
- Use history to compare entropy trends across multiple generations.
- Download and store TXT files in an encrypted vault for long-term safekeeping.
- Rotate passwords every 90 days and avoid patterns across different accounts.
Glossary:
- Entropy
- Quantifies randomness in bits; higher numbers indicate stronger passwords.
- Strength Score
- Four-level rating that reflects how resistant a password is to cracking.
- Ambiguous Characters
- Visually similar symbols that can cause mistyped entries.
- Clipboard
- Temporary storage area used when copying data within the operating system.
- Crack Time
- Estimated duration an attacker needs to guess the password with modern hardware.