Random Sampling for Research

Generate random samples, assign random IDs, or select a random subset from a numbered dataset.

Nid oes angen mewngofnodi

Minimum

Maximum

🔒 Every number uses your browser’s cryptographically-secure randomness (crypto.getRandomValues) — genuinely fair, not the predictable Math.random(). Nothing is sent anywhere.

Research tips

📊

For random sampling from N records, generate a list of K unique numbers in the range 1–N. Those row numbers become your sample.

💡

Unique mode ensures no record is sampled twice — equivalent to sampling without replacement, which is standard in most research designs.

🔐

Cryptographically secure randomness produces proper uniform distributions, suitable for scientific and statistical sampling.

📋

Export the list with "Copy all" to paste your random sample indices into Excel, R, Python, or your analysis tool.

Sut Mae'n Gweithio

Ewch i mewn

Enter your data into the tool above. Everything stays local to your browser.

Proses

The tool processes your data instantly in your browser using JavaScript. No server, no waiting.

Lawrlwythwch

Get your result instantly. Nothing is stored after you leave the page — complete privacy.

Pam defnyddio ein un ni?

✓Hollol rhad ac am ddim - dim costau cudd, byth

✓Nid oes angen cyfrif, e-bost na mewngofnodi

✓Nid yw ffeiliau byth yn gadael eich dyfais

✓Dim cyfyngiadau maint ffeil o gwbl

✓Dim dyfrnodau ar unrhyw allbwn

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