Fit another application
Create outputs small enough for a worksheet, upload form, model, reporting tool, or legacy system.
Local CSV splitting
Split a large CSV file into manageable outputs
Create smaller CSV files for spreadsheets, uploads, teams, regions, or downstream systems. DataOlllo can split the source locally by row count, target size, or unique column values.
Why split a large CSV?
Splitting does not change the business meaning of the data. It changes the delivery unit so each output can fit a tool, owner, location, process, or transfer limit.
Assign data by owner
Separate records by region, department, client, store, product category, or another column.
Process in batches
Divide one oversized source into predictable chunks for review or downstream automation.
Common ways to split a large CSV file
Choose the method based on how the outputs will be consumed—not only on the size of the source.
Split by row count
Create parts with a selected maximum number of rows. Useful when a destination has a record limit or reviewers need consistent batches.
Split by target file size
Produce smaller files for transfer or systems that enforce approximate MB or GB limits. Final sizes can vary with row length and encoding.
Split by column value
Create one output per value, such as region, branch, category, customer, facility, or status.
The DataOlllo split workflow
DataOlllo provides a visual local process. Select the source, choose a method and destination, review the settings, and generate the outputs.
Keep the original CSV unchanged. Write parts to a separate folder so the source, configuration, and outputs remain easy to audit.
1. Select the sourceChoose the large CSV from local storage.
2. Choose the methodUse rows, target size, or column values.
3. Set output detailsChoose destination and naming rules.
4. Run and verifyCheck file count, headers, sample rows, and totals.
Export results that remain useful
A successful split preserves context and makes downstream use predictable.
Keep headers
Each part should carry the column names required to interpret its rows.
Use clear filenames
Include part numbers or sanitized column values so outputs can be identified without opening them.
Reconcile counts
Compare source and output row totals, accounting for headers and any deliberate filters.
Split large CSV FAQ
How can I split a large CSV file?
Use DataOlllo's local splitter. Select the file, choose row count, target size, or column values, set an output folder, and run the split.
Can I split without loading the full file into a spreadsheet?
Yes. The split workflow is intended for oversized local files and does not require a worksheet.
Can I create one CSV per region or category?
Yes. Split by a selected column's unique values to create logically grouped outputs.
Will splitting modify the original CSV?
The workflow creates new output files. Keep them in a separate folder and preserve the original as your source of record.
Divide the file without uploading it
For files up to 500 MiB, use the free browser splitter. For multi-gigabyte and repeatable workflows, use DataOlllo Desktop.
Split a CSV in your browserPublished by DataOlllo · Updated July 21, 2026