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Excel File Splitter

Split large Excel workbooks by sheet, row count, column value, or file size. Export to XLSX, CSV, TSV, JSON, or JSONL. Tested reliably with workbooks up to ~250,000 rows (~12 MB); for larger files, save as CSV and use the CSV Splitter.

How it works: Upload Excel file → analyze sheets → configure split options → download files. Privacy first: All processing happens in your browser.
Benchmark Performance
Measured baseline · production-ready
50K rows/sec
~250K rows
XLSX export
View full benchmark →
100% Client-Side•Your data never leaves your browser
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