Is this password generator safe?

Yes. PDFFlare's password generator runs entirely in your browser — every random byte comes from your machine's crypto.getRandomValues() (the Web Crypto API's CSPRNG). Nothing uploads, nothing logs, nothing is sent to a server. Your generated passwords never leave your device.

What's the difference between a password and a passphrase?

A password is a short string of random characters (e.g., aB3$xK9mPq2v). A passphrase is a longer string of random words separated by hyphens or spaces (e.g., correct-horse-battery-staple). For the same security level, passphrases are dramatically easier to remember and type. PDFFlare's passphrase generator uses a 1900+ word curated wordlist — about 11 bits of entropy per word.

How many bits of entropy do I need?

60 bits is the minimum for personal accounts (resists targeted brute-force for several years at 10 billion guesses/sec). 80 bits is comfortably strong for high-value accounts. 100+ bits is overkill for everything except cryptographic keys. PDFFlare's strength meter labels entropy as Very Weak (<28 bits), Weak (<50), Fair (<50–70), Strong (70–100), and Very Strong (100+).

Are these passwords actually random?

Yes — cryptographically random. PDFFlare uses crypto.getRandomValues() with rejection sampling for unbiased uniform integer selection. We never use Math.random() (which is predictable). Every password, passphrase, and PIN is independently generated — knowing one tells you nothing about any other.

Can I trust diceware-style passphrases for production accounts?

Yes — diceware is the most-recommended passphrase technique among security researchers (EFF, NIST, Bruce Schneier). PDFFlare's passphrase generator is functionally equivalent: random word selection from a curated wordlist using a CSPRNG. A 6-word passphrase from our wordlist gives ~65 bits of entropy; an 8-word passphrase gives ~87 bits.

Do my passwords leave my browser?

No. PDFFlare's password generator is 100% client-side. The wordlist, the random number generation, the strength estimation — all of it runs in your browser. There's no API call, no analytics on the generated values, no logs. Safe for production credentials, root passwords, recovery seeds, anything.

Why exclude similar characters like l, 1, I, O, 0?

When you have to read or transcribe a password (writing it on paper, dictating to someone, typing from a screenshot), the lowercase L, the digit 1, the uppercase I, the uppercase O, and the digit 0 are easily confused depending on the font. Toggling Exclude similar in the random mode produces passwords that are harder to mistype. The trade-off: a slightly smaller character pool means slightly less entropy per character, so you may want a 1-2 character longer password to compensate.

What is a strong passphrase?

A passphrase of 4+ random words from a large wordlist, joined by separators. “correct-horse-battery-staple” (the famous XKCD example) is ~44 bits — fine for low-stakes accounts. PDFFlare's default 6-word passphrase from a 1944-word list is ~65 bits — strong for everything except cryptographic seeds. The key is randomness: a memorable phrase you invented yourself (“MyDogIsCool2024!”) is much weaker than it looks because attackers know human patterns.

Password Generator Online — Strong & Free

Password generator online — create cryptographically secure random passwords, passphrases, pronounceable, or PINs. Free, browser-based, no signup.

PDFFlare's password generator online produces cryptographically secure passwords in four modes: Random (configurable length and character sets), Passphrase (memorable diceware-style word combinations from a 1944-word curated wordlist), Pronounceable (CVCV-pattern that's easier to type), and PIN (numeric only). Generate one or one hundred at a time, with a live strength meter showing entropy in bits and brute-force resistance.

Building out a dev workflow? Pair this with UUID Generator for unique identifiers, Hash Generator to compute MD5/SHA-256 of arbitrary text, or JWT Decoder to inspect auth tokens.

Every byte of randomness comes from your browser's crypto.getRandomValues() with rejection sampling for unbiased uniform selection. No Math.random(), no server round-trip, no analytics on the generated values. Production-safe for personal accounts, server credentials, password manager bulk seeds, and recovery codes.

Generation mode

Length (20)

Character sets

UppercaseLowercaseNumbersSymbols

Exclude similar characters (l, 1, I, O, 0)Exclude ambiguous symbols ({} [] () /\ etc.)

How many? (5)

StrengthVery Strong

130 bits of entropy~2158056614.2T years to crack at 10B guesses/sec

Generated (0)

Adjust options on the left — passwords appear here.

How to Generate Passwords

Pick a generation mode
Choose Random Password (default), Passphrase (memorable, diceware-style), Pronounceable (CVCV pattern), or PIN (numeric only). Each mode has its own configuration panel.
Configure options
Set length, character sets, separators, word count, and bulk count. The strength meter updates live as you change settings, showing entropy in bits and an estimated brute-force time.
Generate, reveal, copy
Passwords regenerate automatically as you change settings. Click Show to reveal, Copy on any row, or Copy all to grab the entire batch as newline-separated text.

When Do You Need a Password Generator Online?

Personal accounts: Every modern account (banking, email, work tools) deserves a unique password. Password reuse is the #1 way credentials get compromised — one breached site exposes every account that shares the same password. A random 16-20 character password per account, stored in a password manager, eliminates the risk.

Server admin: Root credentials, database superuser passwords, API keys, service account secrets — these need to be strong and unique. The Random mode at 32 characters with all four character sets gives ~210 bits of entropy: completely brute-force-resistant.

Password manager bulk seed: Migrating to a password manager? Set count to 50 or 100, generate a batch of unique 20-character passwords, and use them to replace every reused or weak password across your account list in one sitting.

Memorable but strong passphrases: For accounts you log into without a password manager (your master password, your laptop login, your password manager vault itself), a 6-8 word passphrase is dramatically easier to remember and type than a random 20-character string — with comparable or better security.

Why Choose PDFFlare's Password Generator Online?

4 Generation Modes

Random, Passphrase, Pronounceable, PIN — every common password pattern in one tool. Switch modes without losing your other settings.

Live Strength Meter

Bits of entropy + qualitative label + brute-force time estimate, updating live as you change settings. See exactly how strong your choices are.

Crypto-Secure Randomness

crypto.getRandomValues() with rejection sampling for unbiased uniform selection. Zero Math.random(). Production-grade for any credential.

100% Browser-Based

Every byte is generated locally. Nothing uploads, nothing logs. Safe for production credentials and root passwords.

Frequently Asked Questions About Password Generator

UUID Generator

v1, v4, v5, v7 + bulk

Hash Generator

MD5, SHA-1, SHA-256 hashes

Base64 Encode/Decode

Encode and decode Base64 strings

URL Encode/Decode

Encode and decode URLs

Color Converter

Convert HEX, RGB, HSL colors

QR Code Generator

Generate QR codes from text or URLs