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Split CSV
Break down large CSVs into manageable pieces with headers preserved.
Files stay on your device
Files are stored locally and deleted automatically after 6 hours.
Drag & drop your file here
Or click to browse from your device.
Preview (first rows)
Quick look at the first lines before splitting.
How to split CSV files safely
Use split mode when a source file is too large for manual review or downstream import limits. Keep a stable delimiter and a repeated header in each chunk.
Recommended workflow
- - Start with a clean source file and confirm the correct delimiter.
- - Set a chunk size aligned with your target system limits (for example 10k to 50k rows).
- - Keep the header row enabled for every output file.
- - Download the ZIP and validate the first and last row of each chunk before sharing.
Quality checks before delivery
- - Verify row count totals: input rows should match the sum of all chunks.
- - Check for accidental column shifts in preview after delimiter auto-detection.
- - Open one generated file in the destination tool to validate compatibility.
Common mistakes
- - Splitting with the wrong delimiter, resulting in one-column outputs.
- - Disabling headers and breaking imports that expect named columns.
- - Using chunk sizes that are too large for destination upload limits.
FAQ
Can I split a CSV with quoted commas?
Yes. The parser preserves quoted values and does not split inside quoted cells.
Should I split before or after cleaning data?
Clean first if possible, then split. This keeps each chunk consistent and easier to audit.