Randomize / Sampling
Random Sample Picker: Simple and Stratified Samples from a List
Paste a list or CSV and pick a random sample of rows without replacement using cryptographic randomness, or a stratified sample with the same share from every group in a chosen column, then copy the result as CSV.
Random Sample Picker: Simple and Stratified Samples from a List: Rows are picked with a partial Fisher–Yates shuffle driven by the browser's cryptographic random numbers, so every row has the same chance and none is picked twice. For a stratified sample, each group in the chosen column contributes the same share, rounded, with at least one row each: 50% of teams with 3, 3, and 2 members picks 2, 2, and 1. Runs 100% locally in your browser with zero server file uploads.
- Category
- Everyday tools
- Runs
- In your browser
- Cost
- Free · no sign-up
- Availability
- Ready to use
Runs entirely in your browser
Rows are picked without replacement using your browser's cryptographic random numbers, so every row has the same chance and none is picked twice. A stratified sample takes the same share from every group in the chosen column, at least one each, so small groups are not missed. Nothing you paste leaves the browser.
Sample size
How many rows to sample depends on the precision you need; the sample size calculator works it out for surveys.
Single numbers
For a random number in a range, use the random number generator.
How to use it
- Paste a list or CSV, with or without a header.
- Choose a simple sample size or a stratified share by column.
- Press pick and copy the rows.
Privacy & limitations
Your data stays in your browser and is never uploaded.
Related tools
Frequently asked questions
What is the difference between simple and stratified sampling?
A simple sample gives every row the same chance, so small groups can be missed by luck; a stratified sample guarantees each group is represented in proportion.
Can I repeat the same sample?
No: each pick uses fresh randomness. Save the result if you need to show which rows were chosen.
Is it fair for a prize draw?
It is unbiased, but for a public draw use a method that witnesses can see, and record the result.
Free tool · runs in your browser · no account required