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61 generators across 5 categories — passwords, UUIDs, text, and more.

🎨Design6 💻Developer Tools21 🗒️Everyday22 🔐Security6 📝Text & Content6

Start with your question

What do you need to generate?

Setting up a new account?Generate a strong, unique password in seconds — length, symbols, and character set all configurable.Password Generator →Want a password you can actually remember?Three random words are harder to crack than a symbol-soup password and far easier to recall.Passphrase Generator →Building an API or database schema?Generate RFC 4122-compliant UUIDs (v4) for primary keys, idempotency tokens, or correlation IDs.UUID Generator →Filling a design mockup?Drop lorem ipsum into your wireframe, slide deck, or template to test layouts without real copy.Lorem Ipsum Generator →Exploring a colour palette?Generate harmonious colour schemes — complementary, triadic, analogous — with hex codes ready to copy.Colour Palette Generator →Need something truly random?Roll dice, flip coins, or pick a random number within any range — no bias, no patterns.Random Number Generator →

Things worth knowing

The maths behind randomness and security

2¹²⁸possible UUIDs

Why UUID collisions are a non-issue

Version 4 UUIDs are randomly generated from a pool of 2¹²⁸ possible values — roughly 340 undecillion. If you generated one UUID every nanosecond since the Big Bang, you would have used less than 0.00000000000001% of the available space. For any real application, the probability of a collision is effectively zero.

3 wordsbeats complex passwords

Why passphrases are stronger than symbols

NIST and the UK's NCSC both recommend random passphrases over complex character-substitution passwords. "correct-horse-battery-staple" has more entropy than "P@ssw0rd!" because it is longer — and length beats complexity every time for brute-force resistance. It also takes seconds to memorise.

62¹²combinations at 12 chars

Why password length matters more than symbols

A 12-character alphanumeric password (upper + lower + digits) has 62¹² ≈ 3.2 × 10²¹ combinations. At a billion guesses per second, brute-forcing one would take over 100 trillion years. Adding a symbol set makes marginal difference — going from 12 to 16 characters adds far more entropy than adding special characters to 8.

5 versionsof UUID

Not all UUIDs are the same

UUIDs come in versions 1–8. Version 1 encodes a timestamp and MAC address (privacy risk). Version 4 is purely random (most common). Version 5 is name-based using SHA-1. Version 7 — gaining fast adoption — is timestamp-prefixed, so UUIDs sort chronologically in a database index, reducing write amplification on B-trees.

Frequently Asked Questions

Are generated passwords or passphrases stored anywhere?

No. All generation happens entirely in your browser — nothing you generate is sent to a server or logged anywhere. The randomness comes from the Web Crypto API (window.crypto.getRandomValues), which uses the operating system's cryptographically secure random number generator.

What is the difference between a password and a passphrase?

A password is typically a short string of mixed characters (letters, digits, symbols). A passphrase is a sequence of random words — usually three or more — separated by spaces or hyphens. Passphrases tend to be longer, which gives them higher entropy, and they are significantly easier to memorise. For accounts that allow spaces in passwords, a passphrase is almost always the better choice.

What version of UUID does the generator produce?

The UUID generator produces version 4 (v4) UUIDs by default — fully random, RFC 4122-compliant, and the most widely supported format. If you need version 1 (timestamp-based) or version 5 (name-based, SHA-1) for a specific use case, look for those options in the generator settings.

How random is the random number generator?

The generator uses window.crypto.getRandomValues, which is a cryptographically secure pseudorandom number generator (CSPRNG) provided by the browser. This is the same source used for cryptographic key generation — it is suitable for security-sensitive applications, not just games or sampling.

Can I set a custom character set for the password generator?

Yes. The password generator lets you toggle uppercase, lowercase, digits, and symbols independently. You can also exclude ambiguous characters (0, O, l, 1) that are easy to misread when copying a password by hand.

What is lorem ipsum text used for?

Lorem ipsum is placeholder text derived from a scrambled passage of Cicero's De Finibus (45 BC). It is used in design and typesetting to fill layouts with realistic-looking text before final copy is available — the human eye reads spacing and flow differently with real text than with repeated words or Xs. It prevents reviewers from focusing on the words rather than the design.

How do I pick a colour palette for a design project?

Start with your primary brand colour and use colour theory to derive the rest. Complementary colours (opposite on the wheel) create high contrast and energy. Analogous colours (adjacent on the wheel) feel harmonious and calm. Triadic schemes (evenly spaced) are vibrant but balanced. The Colour Palette Generator outputs HSL and hex values ready to paste into Figma, CSS, or Tailwind.

Can I generate multiple values at once?

Yes. The UUID generator outputs a configurable batch size per generation. The lorem ipsum generator lets you choose paragraphs, sentences, or word count. The random number generator supports ranges and multiple draws. Each tool documents its batch options in the input panel.

Are generated values unique every time?

For UUIDs and passwords, yes — each generation draws fresh randomness. For lorem ipsum, the output is deterministic from a fixed word list, so very long outputs may repeat sequences. For colour palettes, the same harmony type applied to the same seed colour will produce the same output.

What should I look for in a strong password?

Length is the most important factor — 12 characters minimum, 16+ for sensitive accounts. Randomness matters more than character variety — a randomly generated 14-character lowercase string is stronger than a manually chosen 10-character mixed-case string. Uniqueness per site ensures one breach does not expose other accounts. Use a password manager to store generated passwords so length is not a barrier.

About this generator library

thecalcu.com brings together free generators across security, developer tools, text, design, and everyday use. Every generator runs entirely in your browser — output is never sent to a server, and all randomness comes from the Web Crypto API for cryptographic-grade unpredictability.

Security generators cover passwords (configurable length and character set), passphrases (word-based, NIST-recommended), and random tokens. Developer generators produce RFC 4122-compliant UUIDs (v4) and arbitrary random numbers within custom ranges. Text generators create lorem ipsum in any volume — paragraphs, sentences, or word count. Design generators output colour palettes with multiple harmony modes and export-ready hex codes.

Everyday generators handle randomness that does not fit a technical category — dice rolls, coin flips, and random picks from a custom list. All generators produce results instantly, allow re-rolling with one click, and let you copy output directly to the clipboard without selecting text.

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