CSV Splitter

How to split a CSV file

1. Choose a local CSV, TSV or TXT file and set its separator, encoding and header options.
2. Choose data rows per part or an exact byte limit. Analyze the whole file before downloading.
3. Review part ranges and byte counts, then download individual files or a small ZIP.

What the splitter handles

• Counts quoted multiline records as one data row and never cuts a record in half.
• Budgets exact UTF-8 bytes, including repeated headers, quotes, line endings and each part’s BOM.
• Preserves cell strings, their order, duplicate rows and positional headers, including blank or repeated labels.
• Reads file slices in a worker and creates one individual part at a time.

When to use it

• Divide a large export into batches with the same column header.
• Fit a CSV under a file size cap measured in bytes, MB or MiB.
• Hand off selected row ranges without copying data into a text editor.

Understand the output

A data row means one logical CSV record. A quoted cell may contain several physical lines. The optional header does not use a row quota; it stays in the first part even if repetition is off.

The size limit applies to encoded output, not input size or ZIP size. Each record, delimiter, quote, outer line ending, repeated header and optional UTF-8 BOM counts. A record that cannot fit in an empty part causes an error instead of a truncated file.

Cell strings remain unchanged, including leading zeros and Unicode. The output uses UTF-8, your selected separator and CRLF or LF. Original quoting, encoding and byte layout may change. A sep= line remains data.

Up to 100 MiB input, 2 million logical records, 256 columns, 1 million text units per record, 1,000 parts and 25 MiB per part. ZIP is limited to 100 parts, 25 MiB of uncompressed CSV and 30 MiB of archive bytes. Larger results still offer individual downloads.

Privacy and spreadsheet safety

File processing happens in your browser. The file is not uploaded by this tool. The page may make normal site requests. CSV values that resemble formulas may run in spreadsheet software; quoting is not a safety fix. Spreadsheet imports may also change long IDs or leading zeros.