Password Generator
Generate strong, random passwords instantly. Customize length, character types, and check strength.
What Is a Password Generator?
A password generator is an online tool that creates strong, random passwords that are hard to guess. It's useful for account registrations, periodic password changes, and setting up Wi-Fi or server credentials — anywhere security matters.
sakutto.ai's password generator uses a cryptographically secure random number generator in your browser. All processing stays local — generated passwords are never sent to or recorded on any server.
Customize length, uppercase/lowercase, numbers, and symbols, with real-time password strength display. Batch generation is supported for setting up multiple accounts at once. Free, no sign-up required.
How to Use the Password Generator
- Adjust the password length with the slider (4–128 characters)
- Select which character types to include (uppercase, lowercase, numbers, symbols)
- Optionally set how many passwords to generate (up to 10)
- Click "Generate Password"
- Copy the generated password(s) using the copy button
Features of sakutto's Password Generator
- 100% Browser-Based
- Passwords are never sent to a server
- Cryptographic Security
- Uses the Web Crypto API's secure random number generator
- Strength Visualization
- Strength meter based on entropy (in bits)
- Flexible Customization
- Fine-tune character types, length, and symbol selection
- Bulk Generation
- Generate up to 10 passwords at once
- Ambiguous Character Exclusion
- Avoid look-alikes such as 0/O and 1/l/I
Use Cases for the Password Generator
Account Registration
Instantly create a strong password when signing up for a new web service or app.
Password Changes
Useful for routine password changes or emergency resets after a suspected breach.
IT Administration
Bulk-generate passwords for multiple accounts. Streamlines IT admin workflows.
Wi-Fi & Shared Passwords
Generate secure, easy-to-type passwords by excluding ambiguous characters.
Related Tools
Want to turn a generated password into a QR code? Try our
Why Password Generator on sakutto is safe
Many online tools upload your files to external servers for processing. This tool never sends your password data to any server — everything is processed entirely in your browser.
* Some AI-powered tools require server-side processing. Tools that send data to a server will always notify you beforehand.
| Comparison | Typical online tools | sakutto |
|---|---|---|
| Where data is sent | Uploaded to external servers | Nowhere — processed in your browser |
| Data leak risk | Risk during transfer and server storage | No risk — no network transfer occurs |
| External traffic | File data travels over the internet | No file data appears in network logs |
| Offline use | Not possible (server required) | Works offline after initial load |
How browser-based processing works
- WebAssembly (WASM): Processes password data in your browser at near-native speed. No server communication occurs.
- Web Workers: Runs on a background thread separate from the main thread, so your browser stays responsive during processing.
- After processing, your browser automatically frees the data from memory. No password data remains outside your device.
For IT security teams: How to verify
You can verify that sakutto never sends your password data externally by checking the Network tab in your browser's DevTools while using the tool. You'll see that no requests involving your password data are made. This can also serve as documentation for your IT security team.
Frequently Asked Questions
Are generated passwords sent to a server?
No. All processing is done entirely in your browser — generated passwords are never sent to any external server. You can use this tool with complete confidence.
How is password strength determined?
Strength is calculated based on the password's entropy (information content) in bits. More character types and longer length increase entropy and strength. A password is rated "Very Strong" at 128 bits or above.
What's the recommended password length?
For general web services, 12 characters or more is recommended. For critical accounts (banking, email, etc.), use 16 characters or more. Including uppercase, lowercase, numbers, and symbols makes your password significantly stronger.
What does "exclude ambiguous characters" mean?
This removes characters that look similar to each other — such as the digit 0 and the letter O, or the digit 1, lowercase L, and uppercase I. This is especially helpful when passwords need to be typed manually.
Could the same password be generated twice?
The tool uses a cryptographically secure random number generator (crypto.getRandomValues), so the probability of generating the same password twice is astronomically low — effectively zero.
Related Articles
All articlesRelated Tools
Text Tool List →Character Counter
Count characters, words, lines, and bytes in real time. Great for social media posts and reports.
TextFullwidth / Halfwidth Converter
Convert between fullwidth and halfwidth characters. Also supports katakana-hiragana conversion for data cleanup.
TextJSON Formatter & Validator
Pretty-print or minify JSON data. Catch syntax errors instantly with line numbers and tree view.
TextText Diff Checker
Compare two texts side by side and highlight every difference. Character-level detection with merge support.
TextJapanese Era Converter
Convert between Western calendar years and Japanese era names (Reiwa, Heisei, Showa). Includes age calculator.