How does CSV Random Sampler make its random choices?

Parsed data-row positions are selected through a secure partial shuffle, so identical rows retain independent chances.

Does CSV Random Sampler upload my inputs or results?

No. Values stay in the current browser tab and are not placed in the URL, analytics, storage, or network requests.

When should I use CSV Random Sampler?

Use it for local spot checks, test subsets, teaching samples, or exploratory review of non-sensitive CSV files.

PRIVATE BROWSER TOOL · PHASE 1

CSV Random Sampler

Select complete CSV records without replacement while retaining headers, duplicate rows, empty cells, and original row numbers. The complete workflow runs locally in this browser, with visible controls and a result you can inspect before copying or downloading.

LOCAL WORKBENCH

Generate a result

No upload · no account · no URL storage

Choose your settings, then select Generate.

How it works

Parse quoted CSV cells, line breaks, delimiters, and the optional header into complete row records.
Securely sample source row positions without replacement while preserving duplicate records.
Return sampled records with the original header and either draw order or source order.

Worked example

Sampling two of four data rows might return source rows 4 and 2, with the header written once.

Limits and interpretation

CSV input is capped at 5 MB, 50,000 rows, 200 columns, and 100,000 cells.
Malformed quoting or inconsistent record width is reported rather than repaired silently.
Sample size cannot exceed the number of parsed data rows.

Privacy

Your inputs and generated results stay in this browser. This tool does not put them in a URL, analytics event, server log, or external request.

Frequently asked questions

How does CSV Random Sampler make its random choices?: Parsed data-row positions are selected through a secure partial shuffle, so identical rows retain independent chances.
Does CSV Random Sampler upload my inputs or results?: No. Values stay in the current browser tab and are not placed in the URL, analytics, storage, or network requests.
When should I use CSV Random Sampler?: Use it for local spot checks, test subsets, teaching samples, or exploratory review of non-sensitive CSV files.