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Time to Crack
Total Entropy
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Pro: generate 2–100 passwords per batch (cryptographically secure) and download them as one file—ideal for provisioning or rotations.
Sign in with a paid plan to unlock bulk generation. Single-password generation above stays free in your browser.
View plansAI will automatically fetch and apply common password requirements for the specified service.
Free online password generator to create secure random passwords in your browser. Set length, character sets, and presets; see entropy and strength.
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Start buildingCommon questions about this tool
Open the Password Generator, choose a preset (Standard 16, High Security 32, Corporate 12, or PIN 6) or set length between 4 and 128, enable the character sets you need, then use the generate/refresh control. The tool creates a secure random password in your browser with the Web Crypto API and shows entropy, a strength label, and an estimated crack time.
Single-password generation runs in your browser using crypto.getRandomValues. Optional bulk generation for paid web plans uses a cryptographically secure server batch; desktop bulk can run on-device. The optional AI Rule Assistant only receives the website/service name you enter to suggest rules—not the generated password.
Length is configurable from 4 to 128 characters. For most accounts, 16+ characters with mixed character types is a practical default; High Security preset uses 32. Longer length usually raises entropy faster than small symbol tweaks alone. Always follow the target site’s maximum length and allowed character rules.
Entropy is estimated from character-pool size and password length (about log2(pool)×length). Labels map to weak, moderate, strong, or very strong. Time-to-crack assumes roughly one billion guesses per second for comparison only—it is not a formal certification and may differ under other attack models.
Yes. Copy places the password on the clipboard and the UI clears the clipboard after 30 seconds. You can also download the password with metadata (length, entropy, strength, crack-time estimate, timestamp) as a local text file. Store secrets in a password manager; avoid sharing them in email or chat.
Yes for single-password generation: create a secure random password in your browser with no signup. Optional bulk generation (2–100 passwords per batch on paid web plans, or larger on-device batches in the desktop app) requires a paid plan or desktop build. Entropy, strength, and crack-time estimates are included for free single passwords.
Enable the Numbers and Symbols toggles (and Uppercase/Lowercase as needed), set length, then generate. Advanced Mode can raise minimum counts per character type, exclude symbols a site rejects, or avoid ambiguous characters such as I, O, l, 0, and 1.
Yes. In the optional AI Rule Assistant, enter a website or service name (up to 100 characters) and request suggestions. The backend returns partial rule settings (such as length or character-set preferences) that merge into the current controls and trigger regeneration. Only the name you typed is sent for the suggestion—not the generated password.
Bulk mode creates multiple passwords in one batch using your current rules and downloads them as a single text file. On the web it is available with a paid plan (2–100 passwords per batch, server-side cryptographically secure generation). The desktop app can allow larger on-device batches. Free users can still generate single passwords in the browser without signup.
Yes. Enable avoid-ambiguous (on by default in Standard settings) to omit characters that are easy to confuse when reading or typing: uppercase I/O, lowercase l, and digits 0/1. You can also exclude custom characters in Advanced Mode if a site rejects specific symbols.
Verified content & sources
This tool's content and its supporting explanations have been created and reviewed by subject-matter experts. Calculations and logic are based on established research sources.
Scope: interactive tool, explanatory content, and related articles.
ToolGrid — Product & Engineering
Leads product strategy, technical architecture, and implementation of the core platform that powers ToolGrid calculators.
ToolGrid — Research & Content
Conducts research, designs calculation methodologies, and produces explanatory content to ensure accurate, practical, and trustworthy tool outputs.
Based on 2 research sources:
Learn what this tool does, when to use it, and how it fits into your workflow.
This free online password generator creates secure random passwords for accounts, devices, and credentials in your browser.
You choose length and character types; the tool builds a password with the Web Crypto API (crypto.getRandomValues), then shows estimated entropy, a strength label, and an approximate time-to-crack.
Use it when you need a random password generator online without installing software. Single-password generation runs in your browser—no signup required for the free generator. Optional bulk generation (paid or desktop) can create multiple passwords in one batch for provisioning or rotations.
I, O, l, 0, 1), set minimum counts per character type, and exclude specific characters.
Strength is derived from entropy: roughly log2(pool size) × length, based on which character classes appear in the result.
Labels map entropy to weak (<40 bits), moderate (40–59), strong (60–79), or very strong (80+).
“Time to crack” is an illustrative estimate assuming about one billion guesses per second—not a guarantee against every attack model (for example offline hash cracking with specialized hardware can differ).
Longer passwords and larger character pools increase search space faster than small tweaks to symbols alone. Prefer unique passwords per account and store them in a password manager rather than reusing or memorizing long random strings.
Free single-password generation is designed to run in the browser from your current settings. Bulk generation on the web uses a server-side cryptographically secure batch for paid plans; desktop bulk can run on-device depending on the app build. The optional AI Rule Assistant sends only the website/service name you enter (up to 100 characters) to request suggested rules—not the password output.
This tool does not replace a password manager, multi-factor authentication, or passkeys. Some sites ban certain symbols or cap length—adjust character sets to match. Crack-time and entropy displays are estimates for comparison, not formal security certifications.
These illustrative combination counts show why length and character-set size matter. They are mathematical examples, not ToolGrid usage statistics.
| Character set | Approx. pool size | Length 8 | Length 16 |
|---|---|---|---|
| Lowercase only | 26 | 268 | 2616 |
| Lowercase + uppercase + digits | 62 | 628 | 6216 |
| Letters, digits, and symbols | ~90 | 908 | 9016 |
Summary: Free online password generator to create secure random passwords in your browser. Set length, character sets, and presets; see entropy and strength.
Articles and guides to get more from this tool
You need a password for a new online account. You sit and think. What should it be? You might type something like "MyDog2024" or "December25…
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