Image & Data
Split CSV File
Split a large CSV into several files by row count, approximate size, or the value of a column.
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Transparent methodology
What the result includes—and what it does not
Built for people whose CSV is too big for an upload limit, a mail merge, or a team hand-off.
Calculation method
- 1Three split modes: every N rows, approximate size per part, or one file per distinct value of a column (grouping).
- 2Every part repeats the original header so each file opens correctly on its own.
Assumptions and limits
- Splitting loads the file in memory first: heavy above 50 MB, with ~100 MB as an approximate desktop maximum.
- File contents are processed locally and never uploaded; the only telemetry is an aggregate operation counter with no file names, column names or contents.
Worked example
Splitting for an upload limit
Input: A 60 MB order log and a 10 MB per-file limit.
Output: Seven numbered parts, each with the header, ready to upload one by one.
How to use it
Three steps. One clear answer.
- 1Enter or paste the values requested by the tool.
- 2Review the input units and choose any relevant options.
- 3Calculate, then copy or download the result you need.
Built for trust
Useful without the friction.
- No registration or paywall before your result.
- Responsive controls for phone, tablet, and desktop.
- Clear assumptions and warnings where estimates have limits.
Frequently asked questions
How does the Split CSV File work?
Three split modes: every N rows, approximate size per part, or one file per distinct value of a column (grouping). Every part repeats the original header so each file opens correctly on its own.
What should I check before using the result?
Splitting loads the file in memory first: heavy above 50 MB, with ~100 MB as an approximate desktop maximum. File contents are processed locally and never uploaded; the only telemetry is an aggregate operation counter with no file names, column names or contents.
How current is this page?
The methodology and source notes were reviewed on 2026-07-25. Editable rates and inputs should still be checked against the provider or authority linked below.
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