CSV to TSV Converter
Handle Million-Row Files in Your Browser

Convert CSV files to TSV (tab-separated values) format instantly in your browser. Handles million-row files with zero upload.

Drag & drop your file here, or browse

Accepts: .csv (up to 500 MB)

Your data stays in your browser. By using this tool, you agree to our Terms and Privacy Policy.

How to Convert CSV to TSV (Large File Support)

1

Drag and drop your CSV file onto the drop zone at the top of the page, or click to browse and select a file.

2

Conversion starts automatically and a preview of the data is displayed.

3

Click the "Download TSV" button to save the converted result.

Features

100% Local Processing

Your files never leave your device. All conversion happens in-browser using DuckDB-WASM — no upload, no server, complete privacy.

Tab-Separated Values

TSV uses tabs as delimiters instead of commas, avoiding issues with commas in data fields. Widely used in bioinformatics, linguistics, and spreadsheet data exchange.

Free & Unlimited

No sign-up, no file count limits, no watermarks. Convert as many CSV files to TSV as you need.

CSV vs TSV Comparison

Both CSV and TSV are plain-text tabular formats. The key difference is the delimiter character.

CSVTSV
DelimiterComma (,)Tab (\t)
Quoting neededWhen data contains commasRarely (tabs in data are uncommon)
Human readabilityGoodBetter (columns align visually)
Spreadsheet supportUniversalUniversal
Data science useVery commonCommon (pandas, R, bioinformatics)

When to Use TSV

  • Data Contains Commas — If your CSV data frequently contains commas (addresses, descriptions), TSV eliminates delimiter ambiguity without complex quoting
  • Bioinformatics & Research — TSV is the standard format in many scientific pipelines. BLAST results, gene expression data, and annotation files all use tab separation
  • Clipboard & Spreadsheet Exchange — When you copy tabular data from spreadsheets, the clipboard uses tab separation. TSV files integrate seamlessly with this workflow

Frequently Asked Questions

Is my data uploaded to a server?
No. Your file never leaves your browser. All processing happens locally using WebAssembly. No data is sent to any server.
Can I convert files with millions of rows?
Yes. This tool uses DuckDB-WASM which can handle millions of rows. For files over 150MB, streaming mode writes directly to disk.
What happens to commas in my data?
Commas in your data are preserved as-is in the TSV output since tab is the delimiter. No quoting is needed for comma-containing fields.
Does the output include headers?
Yes. The first row of the TSV output contains the column headers from your original CSV file.
What encoding is used?
The tool auto-detects your CSV encoding (UTF-8, Shift-JIS, EUC-JP, etc.) and outputs UTF-8 TSV.
Can I convert TSV back to CSV?
Yes. Use our TSV to CSV converter tool for the reverse conversion.
What is the file size limit?
The input limit is 500MB. For files over 150MB, the tool automatically offers streaming mode which writes directly to disk.
Does this work on mobile?
Yes, the converter works on any modern browser including mobile Chrome and Safari, though very large files may be limited by device memory.

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