Inspect Large CSV Files Locally.

DataOlllo is a desktop data preparation app for inspecting columns, checking records, filtering data, and exporting a useful subset when a full spreadsheet is impractical.

Download Viewer FreeDownloads standard DataOlllo PC App

View Massive Files Without Crashing

BEFORE

Traditional spreadsheets freezing on 500MB Parquet/CSV.

Traditional Spreadsheets - large_dataset.csv

Not Responding

Loading row 1,048,576 / 15,000,000

↓

AFTER

DataOlllo Streams Native Formats.

dataset_15M_rows.parquet

Loaded in 1.2s

user_id

event_type

metadata_json

UID-99120

page_view

{"loc":"US","ref":"google"}

UID-99121

click

{"btn":"signup"}

Inspect supported tabular formats, including CSV and Parquet.

Open Multi-Format Data Locally

Beyond CSV limits

A CSV can contain more rows than a spreadsheet grid can display. Inspect a preview first, then filter or split the source. Capacity depends on column width, data types, the operation, and available memory and disk space.

Modern Formats

Stop writing Python scripts just to see what's inside a Parquet or HDF5 file. Open Arrow, JSON, SAS, SPSS, and SQLite natively.

Choose a Manageable Result

File handling varies by format and operation. Keep only needed columns and rows before an expensive sort or join, and leave room for temporary data and exports on disk.

No Uploads Required.

Why upload a 5GB file to the cloud just to see the first 10 rows?
DataOlllo streams it directly from your hard drive.

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