Convert and compress CSV data — locally
Switch your data between CSV and TSV with quoting rules intact, or gzip it for a much smaller transfer file. Processing happens in your browser — your data rows never touch a server.
What this tool does
CSV and TSV differ in more than the separator: quoting, escapes and embedded newlines follow rules that naive find-and-replace breaks. This tool performs the conversion with RFC 4180-aware parsing, so fields containing commas, tabs or line breaks arrive intact on the other side.
For size, CSV data compresses extremely well with gzip — often losing most of its weight. The tool measures the real result and reports it.
How to convert a CSV without uploading it
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Drop in your data. Add your .csv file to the home-page tool.
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Pick the operation. Convert to TSV (or back to CSV), or compress the file with gzip.
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Download. Save the converted or compressed file — created entirely on your device.
Supported operations
This list is generated from CompressKit's capability registry — only implemented and tested operations appear here.
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Convert format
CSV ↔ TSV conversion with RFC 4180 quoting rules preserved.
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Reduce file size
Gzip the CSV for a dramatically smaller file.
Frequently asked questions
- What is the difference between CSV and TSV?
- CSV separates fields with commas, TSV with tabs. Beyond that they follow the same quoting discipline — which is exactly why automatic conversion with proper parsing matters, and naive text replacement is dangerous.
- Will my data be sent to a server?
- No. Your rows are parsed and rewritten inside your browser. Nothing — not the data, not the filename — leaves your device.
- How much smaller does a gzipped CSV get?
- Text data compresses extremely well; large CSVs commonly shrink to a small fraction of their original size. The tool shows you the exact measured figure for your file rather than a typical claim.
- Can I convert a CSV to Excel format?
- Not here: full XLSX conversion is a different engine and is not claimed. You can open any CSV directly in Excel, or convert between CSV and TSV with this tool.
Ready to try it?
The CSV compressor tool runs on this site with no upload step — your file is processed by your own browser and saved back to your device.
Open the CSV compressor tool