Zero Snippet

Password generator — strong random passwords, custom charset, bulk mode for developers

Use this free online password generator to create cryptographically random passwords with configurable length, uppercase and lowercase letters, numbers, and symbols. Turn on exclude ambiguous characters when you read secrets aloud or support users on the phone. Add extra characters or load a UTF-8 charset file for locale-specific or policy-driven alphabets. Generate a single login secret or bulk passwords for staging tenants, QA accounts, and load tests—then copy every line in one click. Randomness comes from crypto.getRandomValues, so drafts stay in your browser. Pair output with our dummy data generator when you need names and emails beside credentials, or with the UUID generator when you need opaque identifiers instead of memorizable strings.

Character sets

Non-whitespace characters merge into the alphabet. File upload appends UTF-8 contents.

Output (one password per line)

Alphabet size: 89 · Approx. entropy: 103.6 bits (for length 16, uniform model).

Random bytes from crypto.getRandomValues. Store production user passwords with a slow hash (Argon2, bcrypt, scrypt)—this page is for strong random strings and developer fixtures, not server-side credential storage.

Why developers still need a dedicated password generator

Product and QA workflows constantly require fresh credentials: disposable admin logins, per-environment service accounts, OAuth client secrets in .env samples, and CSVs full of users for integration suites. A strong password generator removes guesswork about length and character classes, enforces at least one symbol from each enabled set, and surfaces approximate entropy so you can compare options before you paste into a password manager or secret store. Unlike memorized phrases, these values are meant to be stored, not typed from memory—optimize for randomness and length, not cleverness.

This tool is not a substitute for server-side password hashing (Argon2, bcrypt, scrypt). It helps you mint candidate secrets; your backend still must hash them with a slow KDF and never log the plaintext. When you need deterministic fingerprints of arbitrary strings instead of random secrets, use the hash generator for MD5 or SHA digests in tests—not for live password storage.

How to use this password generator (step by step)

  1. Set length (4–256) and how many passwords (1–500). Short lengths may be rejected if they cannot satisfy every enabled character class after exclusions.
  2. Toggle lowercase, uppercase, digits, and symbols. Enable exclude ambiguous to drop easily confused glyphs such as 0, O, 1, and l.
  3. Optionally type extra characters or click Load charset file to append UTF-8 code points from a local file—nothing is uploaded to a server; the browser reads the file and merges distinct characters into the alphabet.
  4. Click Generate passwords for a fresh batch. Use Copy all or the copy control on the output box to grab every line. For API keys encoded as text, you may also like the Base64 encoder and decoder.

Keywords and search intents this page covers

Teams search for a secure random password generator, password generator with symbols, bulk password generator for testing, or exclude ambiguous characters password. This page answers those intents with explicit controls, local-only randomness, and copy-friendly output. If you are normalizing URLs or query strings before hashing or signing, run them through the URL encoder and decoder so bytes match what servers receive.

Entropy, length, and password policy (practical notes)

The UI shows an approximate entropy estimate assuming each character is drawn uniformly from the displayed alphabet. Real-world policies (mandatory rotations, composition rules) can reduce usable entropy; this estimate is still useful for comparing two configurations side by side. Prefer longer secrets over exotic symbol sets when your stack allows—especially for API keys and machine-to-machine tokens. Human-facing passwords should live in a password manager with unique entries per site.

Privacy and security boundaries

Generated values never leave the tab unless you copy them elsewhere. Avoid pasting production secrets into shared screen-share sessions or ticket systems that retain history. For structured test data exports, combine passwords with JSON or CSV using the JSON formatter and validator or CSV to JSON workflows so fixtures stay readable in code review.

Related developer tools

Explore the full code and developer tools catalog. Highlights:

  • JSON Formatter & Validator — Format, validate, minify, and explore JSON in a collapsible tree—fix payloads before they hit production.
  • JSON to CSV Converter — Turn JSON arrays into downloadable CSV with automatic column detection for spreadsheets and BI tools.
  • JSON to YAML Converter — Convert JSON to readable YAML for configs and Kubernetes—copy or download the result.
  • CSV to JSON Converter — Paste or upload CSV and get structured JSON with header-aware typing for APIs and apps.
  • YAML to JSON Converter — Parse YAML to valid JSON with clear errors—ideal for CI configs and cloud templates.
  • XML Formatter & Validator — Beautify and validate XML with structure insight and actionable parse errors.
  • Regex Tester & Debugger — Test patterns live with highlights, capture groups, and flags—debug regex without leaving the browser.
  • SQL Formatter — Pretty-print SQL with indentation and keyword casing for readable queries and code review.
  • HTML Formatter & Minifier — Beautify or minify HTML and compare raw markup with a quick rendered preview.
  • CSS Formatter & Minifier — Format messy stylesheets or minify CSS for faster loads—keep design tokens consistent.
  • JavaScript Formatter & Minifier — Pretty-print or minify JavaScript for debugging locally and shipping smaller bundles.
  • HTML to Markdown Converter — Convert HTML snippets to Markdown for docs, CMS migrations, and README cleanup.
  • Markdown to HTML Converter — Turn Markdown into HTML with a live preview—handy for emails, blogs, and static pages.
  • Code Diff Checker — Compare two code blocks side by side with clear add/remove highlighting for reviews.

Frequently asked questions

Is this password generator cryptographically secure?
Passwords are built from random indices sampled using your browser’s crypto.getRandomValues API (uniform reduction), not Math.random. That is appropriate for strong secrets in typical web threat models. For regulated environments, follow your security team’s policy and prefer OS or HSM-backed generators where mandated.
Are my passwords sent to your servers?
No. Generation, copying, and optional file loading for extra characters all run in your browser tab. This page does not upload generated passwords unless you manually paste them elsewhere.
What does “exclude ambiguous characters” remove?
It drops characters that are easy to misread out loud or on some fonts—commonly 0, O, o, 1, l, I, and the vertical bar. Your final charset may shrink; if a required character class becomes empty, widen your options or turn off that exclusion.
How do I generate many passwords for test accounts?
Set “How many passwords” to the batch size (up to 500), tune length and character sets, then click Generate passwords. Use Copy all to paste into spreadsheets, seed scripts, or tickets. For structured fake users (names, emails), pair output with the dummy data generator in the developer tools catalog.
Can I add my own symbols or non-Latin characters?
Yes. Type or paste characters into “Extra characters”, or click Load charset file to read a UTF-8 text file—every distinct code point in the file is merged into the alphabet (whitespace is skipped). Useful for locale-specific rules or internal policy symbol lists.
Why enforce at least one character from each selected type?
If you enable uppercase, lowercase, numbers, and symbols, a purely random string might miss a class (especially with short lengths). The tool guarantees one pick from each enabled pool that still has characters after exclusions, then fills the rest randomly and shuffles, so policy checks like “must include a symbol” are satisfied when those sets are non-empty.
Is a long password always better than a complex one?
Length and alphabet size both add entropy. A longer password from a smaller charset can beat a short password with symbols, depending on the numbers. The tool shows an approximate entropy estimate. Prefer unique passwords per site and a password manager rather than reusing one strong string everywhere.
Which other tools complement password generation?
Use the hash generator for checksums of arbitrary text (not for storing user passwords), the Base64 encoder for binary-safe strings, the UUID generator for opaque IDs, and the URL encoder when embedding secrets in query strings during tests—each is linked from the code and developer tools section.