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PRODUCTIVITY

Random Picker & Number Generator

Paste names, ideas, tasks, or options to pick or shuffle a list, or generate random numbers from a range locally in your browser.

Tool statusRuns in your browser
Preview
prontouso://tools/random-picker
NO LOGINLOCAL

Prepare the draw

One item per line or separated by commas.

INPUT
4VALID ITEMS
1TO BE DRAWN
25.0%CHANCE PER ITEM*
*Simple estimate when all items have equal weight without replacement.

The result appears here.

Prepare the list or number range and run the draw. Nothing is sent outside this browser.

How it works

  1. Enter your input

    Fill in the values, paste your text, or upload the file this tool works with.

  2. See results instantly

    Most tools update live as you type; a few use a single button. Either way, the result appears right on this page.

  3. Use your results

    Copy, download, or share what the tool produces — you're always in control of the output.

Privacy and processing — Runs locally in your browser. This tool does not upload your input.

What is Random Picker & Number Generator?

A random picker and number generator that uses the browser's Web Crypto API for cryptographically strong randomness — pick items from a list without or with repetition, or generate integer or decimal numbers within a range, with a history of recent draws.

UNDERSTAND THE TOOL

How the random picker and number generator work

On the List tab, paste items to pick without repeats (or with repeats) and shuffle. On the Numbers tab, generate random values within a range, with decimal places and unique-result options.

Cryptographically strong randomness, not Math.random()

The tool uses crypto.getRandomValues(), the same API used to generate secure keys and tokens in the browser, instead of the common Math.random(). Picked indices also go through rejection sampling — a technique that discards results outside a uniform range — to guarantee no item or number has a slightly higher chance of being picked because of rounding.

Without repetition vs. with repetition

In the default mode (without repetition), each picked item leaves the list before the next draw, so the same item never appears twice in one result. Turning on 'allow repeat' makes each draw independent of the previous ones — the same item can come up more than once, like a draw with replacement.

  • Without repetition: useful for handing out different prizes or tasks among participants.
  • With repetition: useful for simulating something like rolling a die multiple times.

The list accepts commas or line breaks

Paste items separated by commas, one per line, or a mix of both — the tool splits them, trims extra whitespace, and ignores blank lines before picking. The 'remove duplicates' option strips repeated items from the list before it calculates stats and picks.

The displayed chance uses a different formula per mode

Without repetition, the chance is simply how many will be picked divided by the total items. With repetition, it's the probability of a specific item coming up at least once across several independent draws — a different calculation, since the same item can be picked again each round.

Chance without repetition
chance = picked / totalItems
Chance with repetition (at least once)
chance = 1 − (1 − 1/totalItems)^draws

Numbers: range, decimal places, and unique values

Set the minimum, maximum, and how many numbers to generate. Decimal places controls precision (0 for integers); 'unique values' avoids repeating the same number in one batch, which is only possible if the range has enough slots for the requested count.

  • Quick presets: die (1-6), 1-10, 1-100, and 1-9999.
  • The swap button flips the minimum and maximum at once.

Casual drawing, not an official raffle

The whole draw runs in your browser — nothing is sent to a server. This tool is meant for casual decisions and lightweight team activities; official raffles, commercial promotions, or regulated contests usually require auditing and legal rules outside the scope of this simple tool.

Frequently Asked Questions

Does the tool use Math.random()?

Not as its main source — it uses crypto.getRandomValues(), the browser's cryptographic randomness API, with a rejection-sampling technique to avoid bias. Math.random() only kicks in as a fallback if the browser doesn't support the cryptographic API.

Can an item be picked twice in the same round?

Only if 'allow repeat' is turned on. In the default mode, each picked item is removed from the temporary list used for that round, so it can't come up again until a new draw.

Why does the calculated chance change when I turn on repetition?

Because the math is different: without repetition it's a simple ratio (picked ÷ total); with repetition it's the probability of coming up at least once across several independent draws, which grows more slowly.

Why does generating unique numbers sometimes fail?

Unique values require the range to have enough slots for the requested count — asking for 20 unique numbers between 1 and 10 is mathematically impossible, since only 10 possible values exist.

Is this suitable for official raffles or commercial promotions?

It works well for casual decisions and team activities, but official raffles and regulated promotions usually require auditing, notarized records, or other legal requirements outside the scope of this tool.

Can I paste a list with repeated items?

Yes — by default they count as separate entries, which affects the calculated chances. Turn on 'remove duplicates' if you want each unique piece of text to count only once before picking.

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