Extract a representative sample from a large CSV file. Choose random, first-N, or systematic sampling methods. Download the sample as a new CSV.
Open CSV Sampling Tool → free, no sign-inA million-row CSV is too large to work with directly — but you don't always need all of it. The CSV Sampling Tool extracts a representative subset: random sampling for statistical work, first-N rows for a quick inspection, or every-Nth-row systematic sampling for specific analyses. The sample is downloaded as a new CSV immediately.
Data scientists preparing training datasets, analysts exploring a new data source before committing to a full import, developers testing with realistic but manageable data volumes.
No tutorials. No learning curve. Open it and get started.
No server uploads. Three sampling strategies are supported — random, first-N, and systematic — covering the most common use cases.
Completely free. No trial period. No premium tier for basic functionality. No account required. Use it as often as you need.
One job, done well. CSV Sampling Tool was built to solve a specific problem cleanly. No feature bloat, no ads, no distractions.
What is systematic sampling?
Selecting every Nth row — for example, every 10th row. This gives a regularly spaced sample rather than a random one.
When should I use random vs first-N?
Random sampling is better for statistical analysis. First-N is useful for inspecting the start of a file.
Is the header included?
Yes — the header row is always included in the sample.
Does large file size cause problems?
Processing is local — very large files may be slow depending on your device.
Is the sampling truly random?
Yes — random sampling uses the browser's random number generator.
Free. Instant. No sign-in. Open it and get the job done.
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