CSV GB+ by Data.olllo – Open and Process CSVs Locally

In plain words

CSV GB+ by Data.olllo is a desktop tool that opens, cleans, and exports large CSV files up to gigabytes in size without requiring code. It offers a point-and-click interface with dual processing backends—one memory-optimized and one disk-backed—to handle massive datasets offline. The tool supports merging, splitting, deduplication, filtering, and batch exporting across multiple formats including CSV, XLSX, JSON, and Parquet. Designed for data professionals, students, and privacy-conscious users who need to process large files locally without uploading data.

written from the facts on this page · September 2026

From the sources

CSV GB+ is a powerful, offline data tool designed to open, process, and export very large CSV files—up to billions of rows—with ease. With a clean, no-code interface, it's perfect for anyone working with data, whether you're an analyst or student.

Handle Massive CSV Files with Speed and Simplicity — No Coding Needed.

Olllo Big CSV is a powerful, offline data tool designed to open, process, and export very large CSV files—up to billions of rows—with ease. With a clean, no-code interface, it's perfect for anyone working with data, whether you're a professional analyst, student, or privacy-conscious user.
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In the maker’s words, at launch

I built CSV GB+ by Data.olllo, a local data tool that lets you open, clean, and export gigabyte-sized CSVs (even billions of rows) without writing code. Most spreadsheet apps choke on big files. Coding in pandas or Polars works—but not everyone wants to write scripts just to filter or merge CSVs. CSV GB+ gives you a…

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