CONVERTER / TSV → CSV

TSV to CSV Converter

Turn tab-separated data into comma-separated CSV. Keep text values, empty cells and quoted multiline records intact. Conversion runs locally in your browser.

How to convert TSV to CSV

Paste tab-separated text or open a UTF-8 .tsv or .txt file, then choose Convert to CSV. Use actual TAB characters between columns. Copy the result or Download converted.csv. Counts describe logical data records, excluding the header; a multiline cell is part of one record.

Input limits

Use up to 5 MB per input. The first record supplies unique, non-empty headers, trimmed at their edges. Every record must have the same number of fields. Double-quote cells containing TABs or line breaks, and double an embedded quote. Empty text lines are ignored; explicit empty fields and whitespace-only records are retained.

TSV to CSV example

TSV input: actual TAB separators, 3 data records

id	name	note
001	"Alex, Jr."	"Ready	for review"
002	Олена	"First line
Second line"
003	" Sam "

CSV output: 3 data records and 3 columns

id,name,note
001,"Alex, Jr.","Ready	for review"
002,Олена,"First line
Second line"
003," Sam ",""

Frequently asked questions

Does this detect commas or other input separators?: No. TAB is always the input delimiter, with standard double-quote escaping. Commas and semicolons inside TSV cells remain ordinary text and are quoted in CSV when needed. A single-column TSV is valid. Text such as backslash-t is not a TAB separator. Header names are trimmed and must be non-empty and unique; field counts and malformed quotes are checked before conversion.
Are IDs, empty cells, Unicode and cell line endings preserved?: Values stay strings: 001 is not converted to a number, spaces are not trimmed, and empty cells remain empty. Quoted TABs, commas, quotes and multiline values are parsed as cells. UTF-8 BOM and CRLF, CR or LF record endings are supported. Generated CSV uses commas and LF between records. Copy and Download retain original uploaded line endings inside cells; textarea previews normalize CRLF/CR to LF. Manual source edits adopt the displayed text. Formula-like strings beginning with =, +, -, @, TAB or CR receive an apostrophe during safe CSV export, including header names.
What happens with headers only, errors or changed input?: Header-only TSV creates a header-only CSV with zero data records and the detected column count. Physically empty text lines are skipped, while separator-only records and quoted empty cells are preserved. Empty output cells and cells containing TABs are explicitly quoted, so even a one-column empty record remains visible as CSV syntax. Invalid TSV or an oversized input clears the previous result and disables Copy/Download. Editing, uploading another file, Use example and Clear also reset results. No files or conversion results are sent to a server. If clipboard access is unavailable, Download preserves the complete CSV independently of the preview.