Password Generator, Strength Checker & File Integrity Verifier (SHA-256)
Generate, check strength, and compute SHA-256 in your browser for each purpose.
Generation conditions
Generated result
Auto-erases in 5 minutes.
Check existing string
Do not enter important passwords you actually use on a shared PC. We do not perform online checks against breached-password databases.
Strength guide
Choose file
Files are not uploaded; they are read locally on your device.
Calculation result
Secrets and files are processed only within your browser.
What you can do with the Password Generator, Strength Checker & File Integrity Verifier
Generates random passwords and passphrases using cryptographic randomness, checks existing strings for length, character variety, repetition, and sequences, and computes file SHA-256 hashes for comparison against publisher values.
Input and files are processed only in your browser and are not sent to WiseChecker or external servers. Generated results and input values are not auto-saved and can be cleared from the screen after a set time.
Unbiased random numbers
Uses crypto.getRandomValues with rejection sampling to generate unbiased selections from the chosen character set.
Memorable passphrase
Pick several unrelated English words and combine them with separators and numbers.
Flag dangerous traits
Flags short length, repeated characters, sequences, keyboard patterns, and common words individually.
Verify file identity
Computes SHA-256 and compares it to the publisher’s 64-character value, ignoring case.
Steps to create a secure password
- Check the rules for your use caseFirst check the service’s requirements: allowed characters, maximum length, symbol requirements, etc.
- Choose generation methodFor a password manager, a long random string is convenient; for manual entry, a sufficiently long passphrase works well.
- Set length and character typesPrioritize length where possible and use a different value for each site.
- Store in a secure locationSave it to a trusted password manager and clear the on-screen result.
- Set up multi-factor authenticationWhere supported, enable an authenticator app or security key.
Choosing between random passwords and passphrases
| Method | Recommended use | Notes |
|---|---|---|
| Random password | Accounts auto-filled from your password manager | Check length limits and allowed symbols |
| Passphrase | For human entry like device login | Don’t use famous quotes, lyrics, or texts verbatim |
| PIN | Device lock with limited attempts | Avoid birthdays, phone numbers, sequences |
The strength estimate assumes fully random selection. Words or patterned strings are weaker in practice even at the same length.
Why check for repeated characters, sequences, common words
aaaaaa, 123456, qwerty Patterns like these are prime candidates attackers try first. Capitalizing or appending a single digit to a word is easily guessed; use independently generated values instead.
Reusing a password across services means a leak from one can be tried on others. This tool does not query online breach databases, so it cannot confirm past breaches.
How to verify file integrity using SHA-256
- Get value from trusted sourceVerify the SHA-256 published on the official site, including via a route separate from the download link.
- Select downloaded fileThe hash is computed from the entire content, not just the filename.
- Paste a 64-character valueComparison ignores case and whitespace.
- Do not run if mismatchRe-download and verify the source, intended version, and hash algorithm.
A matching SHA-256 confirms the content is almost certainly identical. However, it cannot prevent tampering with the published hash itself. If a digital signature is provided, verify that as well.
Handling large files and sensitive data
SHA-256 calculation loads the entire file into device memory. For large files, this can slow down your browser, so if the file exceeds 1 GB, use your operating system’s built-in commands or the verification method recommended by the distributor. On smartphones, memory may run out even with smaller files.
Auto-erase clears on-screen input. It cannot delete clipboard contents, browser history, OS screenshots, or anything pasted into other apps. On shared devices, close the tab after use.
Processed without external transmission
Random generation, strength evaluation, warning checks, SHA-256 computation, comparison, and report creation run in your browser. Passwords, passphrases, files, and hash values are not sent to servers or AI. Reloading the page clears all input and results.
FAQ for password and file safety checks
Is the generated password saved?
Not saved. Move only the needed value to a secure password manager.
Is it truly random?
Uses crypto.getRandomValues in supported browsers to avoid bias in character selection.
Is the strength in bits guaranteed?
No. It’s an upper-bound estimate based on character set and length; actual security is lower with patterns or breach history.
Does a matching SHA-256 hash mean the file is safe?
This confirms content integrity but does not guarantee the absence of malware or the safety of the source itself.
Does it support MD5 or SHA-1?
SHA-256 is used for integrity verification. Older algorithms are excluded due to collision-resistance issues.
Is the file uploaded?
No upload. Read and calculated in your browser on this device.
Related free tools
Practical examples
Generate a new password without reusing an example
Choose the length and character rules required by the account, then generate a fresh result. Use a unique password for each account and keep it in a trusted password manager. Do not use a password printed in a tutorial or screenshot.
The strength estimate is not a breach-database lookup or a guarantee against guessing. A generated password is not applied to an account automatically; change it through the service’s official settings and enable multifactor authentication when available.
Compare a download with the publisher’s SHA-256
Select the downloaded file and paste the expected SHA-256 from the publisher’s trusted channel. Calculate the hash and compare all 64 hexadecimal characters. A mismatch means the files differ; it does not tell you why.
A matching checksum proves agreement with the reference value, not that the file is malware-free. A checksum from the same untrusted download page is not independent verification. Files are hashed on this device, not uploaded.