Live · Mac
DataSlicer
Combine CSV files into one clean dataset, then split it into files capped at whatever row count you need — header in every file. Built for huge files, and it never touches your originals.
Free · no network access · your files never leave your Mac
Many files, one dataset
Drop in one CSV or twenty. DataSlicer combines them into a single dataset with one header — no duplicate header rows sneaking into your data.
Split to the size you need
Set a maximum row count — 100,000 by default, or whatever your tool of choice can swallow — and get tidy output files, each with the header included.
Built for big files
DataSlicer streams your data instead of loading it, so millions of rows flow through without breaking a sweat — or your Mac's memory.
Your data stays yours
Source files are never modified, and the app has zero network access — enforced by macOS itself, not just promised. Nothing ever leaves your Mac.
Need help?
Questions or feedback about DataSlicer? Email hello@quackquacklabs.com and we'll get back to you.