Convert TAB to CSV
Convert TAB to CSV instantly in your browser. Free, fast, and private - your files are processed locally on your device.
Drop your TAB files here
Up to 5MB per file.
Files never leave your browser
How to Convert
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Upload your TAB files
Drag and drop or select TAB files from your device. You can upload multiple files at once.
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Configure Output
Start the conversion. Crest Convert will prepare the CSV file using the appropriate format engine.
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Download CSV files
Once conversion finishes, download your files individually or as a compressed ZIP archive.
Why convert TAB to CSV?
Convert TAB files to CSV locally, with no file upload or account required.
Clear validation protects against duplicate headers, unsupported structures and oversized files instead of quietly discarding data. See the format notes below before importing the output into another application.
Frequently Asked Questions
Are tabs inside quoted TSV fields treated as separators?
No. Quoted fields can contain tabs or line breaks. The parser retains their contents and writes correctly quoted CSV fields, including doubled quotation marks where needed.
Which CSV delimiter and encoding are used?
The output is comma-separated UTF-8 with a byte-order mark and CRLF row endings. Every field is quoted. Formula-like values receive a safety apostrophe; choose JSON for unmodified literal text.
How do I convert TAB to CSV?
Select a file up to 5 MB, start the conversion, and download the result. Processing runs locally in your browser. Table conversions support up to 20,000 records, 256 columns and 200,000 cells.
Are my files uploaded?
No. This converter processes the file in a local browser worker. File contents are not sent to the conversion server, and the file is not used to train AI.
How are data types and spreadsheet safety handled?
Table text is kept as text, including leading zeros. XLSX output uses text cells rather than executable formulas. CSV/TSV fields beginning with formula-like characters receive a leading apostrophe for spreadsheet safety; choose XLSX or JSON if you need exact literal values. Nested table values use JSON text rather than ambiguous flattened field names.