Sample rows from a large CSV online — random sampling, first N, last N, or every-nth row to reduce dataset size.
Free for files up to 5 MB and 10,000 rows. Files are processed in your
browser — nothing is uploaded to a server. No account required.
About Data Sampler
Cut a large file down to a workable size. Random pulls N rows from anywhere in the file, First N and Last N take from either end, and Every Nth walks the file at a fixed interval.
Testing a mapping against a two-million-row event export is the standard case: take 500 random rows, push them through the import, and find the schema problem before committing to the full load. For time-series data, Every Nth is the better pick, because it keeps a spread across the whole period instead of clustering at one end.
Random sampling never returns the same row twice, and sampled rows keep their original file order so they stay easy to trace back.
Related tools
CSV Viewer — Free online CSV viewer to open, search, sort, and paginate large CSV files instantly in your browser — no upload required.
CSV Editor — Free online CSV editor to edit cells, add or delete rows and columns, with undo/redo and instant export back to CSV.
CSV Validator — Validate CSV files online — find missing values, cells that break their column's type, duplicate headers, and mojibake left by a bad export.
CSV Cleaner — Clean messy CSV files online: trim whitespace from every cell, drop rows that are entirely empty, and tidy header names — in one pass, in your browser.
CSV Deduplicator — Find and remove duplicate rows in CSV files online — match across selected columns and export a clean, unique dataset.
CSV Sorter — Sort CSV files online by one or multiple columns, ascending or descending, with stable multi-key ordering and instant export.