Get BigXL for your computer
BigXL is in private beta. Pick your system, leave your email, and we send you a signed installer.
BigXL never connects to the internet. Check it yourself with Little Snitch, LuLu or your own firewall.
Closed Beta Invitation
Get early access on your own hardware.
Tell us what platform you use and what file size is giving you trouble. We review each application personally and send signed installers with trial keys directly to your email.
Built for non-technical teams
Why operators join the BigXL beta.
You do not need to learn Python, set up Docker, or run terminal commands to open large files.
Zero Learning Curve
If you can use Excel, you already know how to use BigXL. Drag and drop any 10 GB+ CSV, GZ, or Parquet file to view, sort, search, and filter in a familiar spreadsheet grid.
100% Private & Safe
Your confidential financial statements, client PII, and sensitive records remain entirely on your local computer. Nothing is ever uploaded to cloud servers or external AI APIs.
Direct Founder Support
Beta testers get direct email access to the engineers who built the app. If a specific file has uneven delimiters, unclosed quotes, or corrupt dates, we help you solve it.
System requirements
A small footprint on an ordinary machine.
Because the file is streamed from disk into a columnar store with a memory ceiling, a 10 GB file does not need a workstation to open.
Free and paid
Free does what Excel does. Paid takes it further.
Opening any size of file, sorting, filtering, charting and CSV export are free for good. Cleaning, the plain-English assistant and the SQL console are in Pro, starting at $99 1st year.