Coming soon · 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.
Drop your email and we'll let you know the moment it's on the Mac App Store.
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 [email protected] and we'll get back to you.