Password Generator
Strong, truly random passwords from crypto.getRandomValues. Live entropy and crack-time display. Runs entirely in your browser — the password exists only on your clipboard.
Strength
very strong
- Alphabet
- 88 chars
- Entropy
- 129.2 bits
- Crack time
- longer than the age of the universe
Crack-time assumes 10¹⁰ guesses/sec — modern offline attacker against a fast hash.
Pick at least one character set to generate passwords.
How to generate a strong random password
Pick a length (longer is always better — past ~14 characters the increment is essentially free), choose which character sets to include, and click ↻ Generate new. ToolChop produces each password using crypto.getRandomValues, the browser's cryptographically secure random source — the same primitive password managers and TLS implementations use. The strength panel shows the alphabet size, entropy in bits, and a conservative crack-time estimate.
Why a local generator matters more than for any other tool
Passwords are credentials. A password is only as secret as the channel it travelled through. An "online password generator" that produces values on its servers has, by construction, seen every password it generated. A site that keeps a "history" feature has logged them. A site whose CDN caches the response page has potentially disclosed them. ToolChop generates locally so the password exists in exactly one place: your clipboard, until you paste it into a password manager.
Length matters more than mix
A 30-character lowercase-only password (~141 bits of entropy) is mathematically stronger than a 10-character mixed-case-with-symbols password (~65 bits). Each extra character at the same alphabet size multiplies the keyspace by the alphabet size. If your target system allows long passwords, default to 20+ characters and the character mix barely matters.
What you can do
- Length 4–128, with sliders or numeric entry
- Toggle uppercase, lowercase, numbers, symbols independently
- Exclude visually-ambiguous characters (Il1O0 etc.)
- Live entropy in bits and crack-time estimate
- Generate 1, 5, 10, or 25 passwords at a time; copy any single or all at once
Frequently asked questions
How do I generate a strong random password online for free?
Pick the length (4 to 128), toggle which character sets to include (uppercase, lowercase, numbers, symbols), and ToolChop produces a cryptographically random password using crypto.getRandomValues. The strength panel shows entropy in bits and an estimated crack time. Generate 1, 5, 10, or 25 at a time. Copy with one click. No account, no upload, no daily limit.
Does ToolChop send the generated passwords to a server?
No. Passwords are produced entirely in your browser using the Web Crypto API (crypto.getRandomValues), which is the same primitive password managers use. They are never transmitted, never logged, and not persisted in localStorage. You can verify in DevTools → Network that no request fires.
Why is the privacy story for a password generator the most important one?
Because passwords ARE the credential. A password is only as secret as the channel it travels through. An 'online password generator' that POSTs your generated password back to its servers — even just for analytics or 'history' — has potentially logged your password in plaintext, given access to anyone with access to its logs, and turned its CDN cache into a possible disclosure vector. ToolChop runs the generator locally so the password exists in exactly one place: your clipboard.
What random source does ToolChop use?
Web Crypto's crypto.getRandomValues, which is a cryptographically secure pseudo-random number generator (CSPRNG) seeded from the operating system's entropy source. This is the same RNG password managers, JWT libraries, and TLS implementations use in browser code. We do NOT use Math.random — which is fast but not secure.
What does the 'entropy in bits' number mean?
Entropy measures the number of equally-likely possibilities for the password. A 20-character password from a 94-character alphabet has 94²⁰ ≈ 2¹³¹ possibilities, or about 131 bits of entropy. Each additional bit doubles the number of guesses needed to crack it. A password with 80+ bits is considered very strong against offline attacks; 100+ is over-built for most threat models but cheap to ask for.
How does ToolChop estimate crack time?
It assumes 10¹⁰ guesses per second — a reasonable upper bound for a determined offline attacker with modern GPUs against a fast hash (e.g. an unsalted SHA-1). Real-world services that use slow KDFs (bcrypt, scrypt, Argon2) are far harder to attack, but assuming the fast-hash case means the estimate is conservative — your password is at least this strong, usually much stronger.
Why does the strength badge not just check character types?
Because length matters more than character mix. A 30-character lowercase-only password (~141 bits) is mathematically stronger than a 10-character mixed-case-with-symbols password (~65 bits). ToolChop shows actual entropy bits, not a vague 'good/strong' badge based on rules. The badge is just a quick visual cue.
What does 'exclude ambiguous characters' do?
Removes characters that look alike in many fonts: capital-I, lowercase-l, 1, capital-O, 0, vertical bar, backtick, single quote, double quote. Useful if the password might be written down or read aloud. Excluding them reduces the alphabet by ~10 characters, so the entropy drops slightly — increase length by 1 or 2 to compensate.
Can I generate multiple passwords at once?
Yes. Pick 1, 5, 10, or 25 from the Generate dropdown. Useful when seeding a list of service accounts or generating a batch of test credentials. Each password is independently random — the entropy stated applies to each one separately.
What is the practical minimum length I should use?
At least 14 characters with a mixed alphabet (numbers + lowercase + uppercase + symbols, ~95 chars) gives ~92 bits, which is comfortably beyond any offline attack against a fast-hashed credential. For master passwords or anything not behind a slow KDF, prefer 20+. For typed passwords where ergonomics matters, a passphrase from a wordlist (Diceware) at 6+ words is also excellent.
Should I store the generated password anywhere?
In a password manager (1Password, Bitwarden, KeePass, your OS keychain). Do not store passwords in plain text files, browser autofill alone without a master password, or chat messages. ToolChop deliberately does not save generated passwords — once you regenerate or close the tab, they are gone from this page.
Why use ToolChop instead of an online password generator I have used before?
Many password generators run on a server (and therefore see the password they generate), persist a 'history' feature (and therefore log it), or rely on browser libraries that have not been audited. ToolChop uses the browser's native crypto.getRandomValues, shows the entropy math explicitly, and never transmits or persists anything. You can confirm in DevTools → Network that no request fires.