Password Generator

Create secure, random passwords with customizable options

Password Options

4 32 64 128

Include Characters:

Security Options:

Generated Passwords

Click "Generate Secure Passwords" to create passwords

Basic Secure

12 chars, letters + numbers

Strong

16 chars, all character types

Maximum

32 chars, ultra secure

PIN Code

4-8 digits only

Passphrase Generator

Click generate to create a passphrase

Password Strength Checker

Password Security Features

  • 🔐 Cryptographically secure random generation
  • 🎯 Customizable character sets and length
  • 📊 Real-time entropy and strength analysis
  • 🚫 Options to avoid ambiguous characters
  • 🔄 Bulk password generation (up to 50)
  • 📝 Memorable passphrase generation

Security Best Practices

  • ✅ Use unique passwords for each account
  • ✅ Minimum 12 characters for good security
  • ✅ Include uppercase, lowercase, numbers, symbols
  • ✅ Avoid personal information or dictionary words
  • ✅ Use a password manager to store securely
  • ✅ Enable two-factor authentication when possible

Example algorithm (days)

// Using date objects in most languages:
days = (date2 - date1).days
Example: Days between 2025-01-01 and 2025-03-01 = 59 days (non-leap year).

6. Days Until

What it does: "Days Until" calculates how many days remain until a target date (a birthday, holiday, event). It is essentially a date-difference from today to a future date but often presented with friendly copy and optional recurrence handling for yearly events.

Features

Example: Today is 2025-09-24 — Days until 2025-12-25 (Christmas) = 92 days.

Putting it all together — Building reliable web calculators

Here are practical tips for developers and product managers building these tools on websites and mobile apps:

Sample HTML form (simplified)

<form id="percentage-form">
<label>Base: <input name="base" type="number" step="any" /></label>
<label>Percentage: <input name="percent" type="number" step="any" /></label>
<button type="submit">Calculate</button>
</form>

Attach client-side JS to compute results instantly and show them inside an accessible result container.

Design & SEO considerations

These calculator pages are highly searchable. Follow these quick SEO tips:

Conclusion

Age, Percentage, Loan, BMI, Date Difference, and Days Until calculators are simple but powerful tools that deliver immediate value. When implemented carefully — with correct formulas, clear UX, accessibility, and privacy considerations — they can significantly improve user engagement and trust. Developers should prefer reliable libraries for date and numeric handling, clearly document assumptions, and provide helpful explanations so users can understand and act on their results.

If you’d like, I can also provide ready-to-use JavaScript snippets for any of the calculators above (for example, a full amortization table script for the Loan Calculator or a BMI widget with unit toggles). Tell me which one you want first and I’ll include a copy-pasteable implementation.

Written as a detailed guide for developers and product teams building small utility calculators for web and mobile. Updated: 2025-09-24.