ToolStackToolStack
Browse Tools →
✓ Password Generator · Crypto-secure · 100% Private

Password
Generator.

Generate strong, cryptographically secure passwords instantly. Uses the Web Crypto API — the same standard as banks and password managers. Everything runs in your browser. Nothing leaves your device.

🔒100% private
Instant generation
🛡️Crypto-secure
🔒No signup
20chars
6 — Minimum64 — Maximum
How it works

Secure passwords in seconds

STEP 01

Configure your settings

Set password length (6–64), choose your character sets: uppercase, lowercase, numbers and symbols.

STEP 02

Generate instantly

Passwords are generated instantly using the Web Crypto API — no network request, no delay, no server involved.

STEP 03

Copy and store

Click any password to copy it instantly. Store it in a password manager like Bitwarden or 1Password for safekeeping.

Features

Built for real security

Cryptographically secure

Uses the Web Crypto API (crypto.getRandomValues) — far stronger than Math.random(). The same standard used by banks and security tools.

Runs in your browser

Zero data leaves your device. No server calls, no logging, no storage. Your passwords are generated and stay entirely on your machine.

Live strength meter

Real-time entropy calculation shows exactly how strong your password is — Weak, Fair, Good, Strong or Very Strong — as you adjust settings.

Fully customisable

Set any length from 6 to 64 characters. Toggle uppercase, lowercase, numbers and symbols independently. Generate 1, 3, 5 or 10 passwords at once.

The mathematics of password security — entropy, character sets and crack time

A password generator is a cryptographic utility that produces strings of randomized characters using high-entropy source data — ensuring the output is computationally unpredictable. ToolStack uses the Web Crypto API (window.crypto.getRandomValues), the same standard used by professional security tools and banking applications. This is fundamentally different from Math.random(), which is not cryptographically secure and should never be used for passwords.

Security TierEntropy BitsCrack Time (2026)
Standard Usage40-60 Bits~3 Weeks
High Security (16+ chars)80-100 Bits~2,400 Years
Maximum Security (20+ chars)128+ BitsAge of Universe

Why human-chosen passwords fail

Human-chosen passwords follow predictable patterns — dictionary words, names, dates, keyboard walks like "qwerty123". Automated cracking tools exploit these patterns using wordlists and rule-based mutations. A truly random 16-character password from a 90-character set has approximately 1031 possible combinations — no pattern to exploit. That is the difference between a password that could be cracked in minutes and one that would take longer than the age of the universe.

FAQ

Frequently asked questions

How secure is this password generator?

Are my passwords saved or sent anywhere?

How long should a password be?

Should I use symbols in passwords?

What is password entropy?

How do I store the passwords I generate?

What is the best password generator?

Password Generator: Free Online Tool

Most people's passwords are terrible — pet names, birthdays, "password123" — because creating a truly random, strong password from memory is nearly impossible. Our Password Generator creates cryptographically random passwords using your browser's built-in crypto API. Nothing is sent to any server. The password exists only on your screen until you copy it.

Set your desired length (8-128 characters), toggle uppercase letters, lowercase letters, numbers, and special symbols on or off, and exclude ambiguous characters (0/O, 1/l/I) if needed. The generator creates a new password instantly. A strength meter shows the estimated crack time. Generate multiple passwords at once and copy any of them with one click.

Common uses include creating unique passwords for every new account signup, generating strong passwords for databases and server access, creating API keys and secrets for development environments, generating Wi-Fi passwords that are strong but still shareable, and bulk-generating temporary passwords for new employee onboarding.

Most password generators either run on the server (your password touches their infrastructure) or use weak randomness (Math.random). Ours uses the Web Crypto API — the same cryptographic randomness used by password managers like 1Password and Bitwarden. Everything runs locally in your browser. Free, unlimited, no signup required.

LIVE · v2.3
SCANNING 10+ AI MODELS
ChatGPTGeminiPerplexityClaudeCopilotMeta AIGrok

Is your brand invisible to AI?

AdvertsGPT scans your site across 10 AI models in 60 seconds and shows you how to rank in AI search before your competitors do.

Live · scanning AI models
ChatGPT
92%
Gemini
78%
Perplexity
64%
CHATGPTGEMINIPERPLEXITYCLAUDECOPILOTMETA AIGROK
0+
AI models
0s
Full audit
Free
No card
Check Your AI Score — Free
Free instant audit — takes 60 seconds
500 FREE
FREE EMAIL MARKETING
NewslettersLanding PagesAutomationSign-up Forms

Your list is leaking money.

AWeber gives you everything to build and grow an email list — newsletters, landing pages, automation and 700+ templates.

Live · new subscribers
+12 /hr
M
maya.chen
maya@figma.com
now
A
alex.w
aw@stripe.co
1s ago
P
priya.k
priya@substack
3s ago
0
Free subs
0+
Templates
Free
No card
Start Free — No Credit Card
Free forever up to 500 subscribers

More Free Tools

61 tools live — all free, no signup, instant results.

View all tools →
AI

AI Prompt Generator

Generate expert prompts for ChatGPT, Claude, Gemini & more using RISEN, STAR, Chain-of-Thought and 4 other frameworks.

Use free →
Writing

Word Counter & Readability

Instant word count, character count, readability score, reading time, keyword density and AI grammar fixer.

Use free →
SEO

Meta Description Generator

Generate SEO-optimised meta descriptions for any page. Character counter included. GPT-4o powered.

Use free →
Marketing

Email Subject Line Tester

Score your email subject lines for open rate potential, spam triggers and emotional power words.

Use free →
#
Social

Hashtag Generator

Generate targeted hashtags for Instagram, TikTok, LinkedIn, YouTube & X. AI-powered 3-tier mix: popular, growing and niche hashtags.

Use free →
Writing

Blog Title Generator

Generate 10 click-worthy blog titles from any topic. SEO, listicles, how-tos, curiosity hooks and more. GPT-4o powered.

Use free →
🛡️
Security

Password Breach Checker

Check if your password was exposed in a data breach. K-anonymity keeps your password 100% private — never sent to any server.

Use free →
Utility

QR Code Generator

Generate QR codes for URLs, WiFi, email, phone and text. Free PNG & SVG download. No signup, no expiry, 100% private.

Use free →
🧮
Finance

VAT Calculator

Add or remove VAT instantly for 40+ countries. UK, EU, UAE, Australia and more. Standard and reduced rates. Invoice calculator included.

Use free →
🧾
Finance

Invoice Generator

Create professional invoices in seconds. Add line items, VAT, discounts and download as PDF. Free, no signup, no watermark.

Use free →
±
Dev

Code Diff Checker

Compare two JSON or code files side-by-side with an IDE-grade visual diff editor. Instantly spot additions, deletions, and modifications.

Use free →
🔑
Dev

JWT Decoder

Decode any JSON Web Token instantly. View header, payload, and all claims. Check expiry, issuer, and subject. 100% client-side — token never leaves your browser.

Use free →
🌐
Dev

Website Down Checker

Check if any website is down or just you. See HTTP status code, response time, and server availability instantly. No signup required.

Use free →
📄
Utility

PDF Generator

Type or paste your text, customise fonts and page size, then download as a clean PDF instantly. No signup, no watermarks, 100% private.

Use free →
🌍
Utility

IP Address Lookup

Find your public IP address, location, ISP, timezone and hostname instantly. Also look up any IP address for geolocation data.

Use free →
🔒
Security

SSL Certificate Checker

Check any website's SSL certificate. See if it's valid, days until expiry, the issuer, and which domains are covered. Instant, free.

Use free →
🔎
Domain

WHOIS Domain Lookup

Look up domain registration date, expiry, registrar and nameservers for any domain. See who owns a domain instantly.

Use free →
⟨/⟩
Dev

UUID Generator

Generate UUID v4, v1, v5, ULID and NanoID in bulk. Uppercase, no-hyphens and braces formatting. Copy all or download as .txt — 100% client-side.

Use free →

YouTube Thumbnail Downloader

Download any YouTube video thumbnail in all 5 resolutions instantly — Max, SD, HQ, MQ and Default. Free, no signup.

Use free →

Online Stopwatch

Stopwatch with lap times and countdown timer. Accurate to the centisecond. Space to start, L to lap, R to reset.

Use free →
📈
Finance

Compound Interest Calculator

See how your money grows with compounding. Add monthly contributions and get a year-by-year breakdown of your investment.

Use free →
{ }
Dev

JSON Formatter

Format, validate and beautify JSON instantly. Syntax highlighting, error detection with line numbers, minify mode. 100% private.

Use free →
Writing

Paraphrasing Tool

Rewrite any text with AI. 6 modes: Standard, Fluency, Formal, Academic, Creative and Shorten. GPT-4o powered, no word limit, no signup.

Use free →
Writing

Grammar Checker

Check and fix grammar, spelling and punctuation with AI. Get corrected text plus explanations for every fix. GPT-4o powered, no word limit.

Use free →
Writing

Text Summarizer

Summarise any text with AI. 4 modes: paragraph, bullet points, key takeaways and executive summary. GPT-4o powered, no word limit, no signup.

Use free →
Aa
Utility

Case Converter

Convert text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, PascalCase, kebab-case and more. 10 modes, instant, free.

Use free →
Utility

Lorem Ipsum Generator

Generate Lorem Ipsum placeholder text instantly. Paragraphs, sentences, words or list items. HTML output included. Free, no signup, unlimited.

Use free →
Writing

Cover Letter Generator

Generate a professional AI cover letter in seconds. 4 tone modes: Professional, Enthusiastic, Concise and Creative. GPT-4o powered, unlimited, no signup.

Use free →
Abc
Writing

Character Counter

Count characters, words, sentences and paragraphs in real time. Live progress bars for Twitter, Instagram, LinkedIn, YouTube, TikTok and SMS limits.

Use free →
Business

Business Name Generator

AI brand architect mode — generate premium names with GoDaddy & TM checks.

Use free →
📹
SEO

YouTube SEO Elite

Generate high-ranking tags & description hooks with AI.

Use free →
Utility

Email Signature Generator

Create professional HTML email signatures for Gmail, Outlook & Apple Mail. 4 templates, custom colours, social links. Free, no signup.

Use free →
🎨
Dev

CSS Gradient Generator

Create beautiful CSS gradients with a visual editor. Linear, radial and conic with 12+ curated presets. Copy CSS instantly.

Use free →
🎨
Design

AI Color Palette Generator

Describe your brand in words and get a professional 5-color palette with hex codes, CSS variables and Tailwind config instantly.

Use free →
👁️
Design

Colour Contrast Checker

Check your colour combinations against WCAG guidelines for AA and AAA compliance.

Use free →
🌟
Dev

Favicon Generator

Generate perfect favicons from text or emoji in all standard sizes including Apple Touch constraints.

Use free →
🔐
Dev

Base64 Converter

Instantly encode text to Base64 or decode Base64 strings back to text securely in your browser.

Use free →
🎯
Marketing

UTM Builder

Generate tracking links for your campaigns to monitor traffic perfectly in Google Analytics.

Use free →
📝
Writing

Markdown Editor

Instantly render Markdown syntax into clean, standard HTML code with real-time visual previews.

Use free →
🔬
Dev

Regex Tester

Test, build, and debug Regular Expressions with real-time semantic highlighting and exact indexing.

Use free →
🗄️
Dev

SQL Formatter

Beautify raw, minified database queries into perfectly indented, readable syntax.

Use free →
⏱️
Dev

Epoch Converter

Instantly translate Unix epoch integers into formatted dates across timezones.

Use free →
🍽️
Finance

Tip Calculator

Calculate tips and split bills instantly. Tipping customs for 20+ countries, service quality presets, and per-person amounts.

Use free →
🏠
Finance

Mortgage Calculator

Monthly payments, total interest, and full amortisation schedule. Repayment and interest-only mortgages. 15 currencies.

Use free →
%
Math

Percentage Calculator

Six calculators in one: find a percentage, increase/decrease, percentage change, and percentage difference.

Use free →
💷
Finance

Salary Calculator

Calculate take-home pay after tax. Full UK PAYE 2024/25 and US Federal 2024 with complete deductions breakdown.

Use free →
🎂
Utility

Age Calculator

Calculate your exact age in years, months, days and hours. Zodiac sign, generation, days until your next birthday.

Use free →
🏆

Card Grading Profit Calculator

Is grading your card worth it? Calculate profit, ROI and compare PSA, BGS, SGC and CSG fees side by side.

Use free →
⚖️

Grading Company Comparison

PSA vs BGS vs SGC vs CGC — compare fees, turnaround times and resale value side-by-side. Personalised recommendation included.

Use free →
📈

Card Flip ROI Calculator

Calculate exact profit after eBay fees, shipping and costs on any card flip. Multi-platform comparison and break-even calculator built in.

Use free →
🎰

Card Box Break Calculator

Price your break spots to cover box cost, platform fees and shipping. See profit at 50%, 75% and 100% fill rates. Whatnot and eBay fees built in.

Use free →
🏷️

eBay Best Offer Calculator

Calculate your break-even offer and get an Accept, Counter or Decline recommendation for any eBay Best Offer. Full profit breakdown at every price level.

Use free →
🔥
Collectibles

Whatnot Seller Fee Calculator

Calculate Whatnot commission and payment processing fees by category. See net payout and compare vs eBay.

Use free →
📒

Panini Sticker Calculator

How many packs to complete any Panini album? World Cup 2026, Premier League, Champions League. See swap savings in GBP, USD and EUR.

Use free →
🎁
Collectibles

Pack Break EV Calculator

Calculate expected value for any box break. Pokémon, sports cards, football cards. EV per pack, net profit after eBay/Whatnot fees, bear/base/bull scenarios.

Use free →
🔥 Live Today

UCL Final 2026 Accumulator

PSG vs Arsenal Champions League final acca calculator. Combined return and implied probability live.

Use free →

WC 2026 Accumulator Calculator

Build your World Cup acca in seconds. Decimal, fractional or American odds across 2–8 selections. Combined return and implied probability instantly.

Use free →
🏆

World Cup 2026 Team Finder

Which World Cup 2026 team should you support? Answer 5 questions and get matched to one of 24 nations with a full team profile.

Use free →
🎬

YouTube Transcript Extractor

Extract any YouTube video transcript instantly as clean Markdown. Toggle timestamps. Download as .md. No login, no limits.

Use free →
💳
Finance

Credit Card Rewards Optimiser

Enter your monthly spend and see which card earns you the most. Compares 10 top cards — Chase, Amex, Capital One. Shows the exact dollar gap you're missing.

Use free →
Collectibles

Pokémon TCG Pocket Pull Calculator

Calculate your odds of pulling Crown Rares, God Packs, Immersive Rares and more. Based on official Pokémon TCG Pocket in-game pull rates.

Use free →