Step 1 / source
Choose the source
Drop one file here
Choose a UTF-8 table where literal tab characters separate fields and rows form one rectangle.
Checking publication status...LOCAL DATA CONVERTER / TSV TO XLSX
TSV to Excel
Turn a tab-separated UTF-8 table into a genuine XLSX worksheet with optional header styling, frozen navigation, and readable widths.
Processed in this browserOne .tsv or .tab file up to 5 MB, limited to 50,001 rows, 200 columns, 1,000,000 cells, and a 20 MB generated workbook. Every row must have equal width.
TSV - 1,000,000 cells
No file upload
This operation runs with browser APIs. Nirmion receives catalogue requests, not the selected source bytes.
Original stays unchanged
The converter creates a separately named output. It never writes back into the source file.
Bounded work
One .tsv or .tab file up to 5 MB, limited to 50,001 rows, 200 columns, 1,000,000 cells, and a 20 MB generated workbook. Every row must have equal width.
Plain-language method
How tabs become worksheet cells
Nirmion parses quoted tabs, doubled quotes, and embedded line breaks, checks that every row has the same number of cells, writes all values as text into a new XLSX worksheet, and optionally styles and freezes the first row. It does not run formulas or infer dates.
- 01Choose a valid source
Use UTF-8 TSV with literal tab separators. Quoted values may contain tabs or line breaks when their quotes are balanced.
- 02Review the conversion choices
Enable Header row when row one contains column names; disable it for headerless matrices. The worksheet name is cleaned to Excel limits.
- 03Inspect the separate result
The result ends in _nirmion_tools_workbook.xlsx. Text values, including leading zeroes, are less likely to change unexpectedly.
Useful when
Practical jobs this tool handles
- Open a database TSV export with spreadsheet navigation.
- Share a tab-delimited report as an XLSX attachment.
- Prepare a headerless matrix for manual spreadsheet work.
Before converting
Verify the tab structure
- Confirm fields are separated by tabs, not spaces.
- Choose the correct first-row header rule.
- Review identifier and date columns after opening the workbook.
Know the boundary
Values stay text
The converter deliberately avoids type guessing, formula creation, date parsing, and regional number conversion. Apply worksheet types only after reviewing the generated file.
Quick answers
Questions before you convert
Text-first writing protects source representation.
Are leading zeroes preserved?
Cells are written as text, which reduces accidental changes to codes and identifiers.
Can quoted cells contain tabs?
Yes, when the source uses balanced CSV-style quotes around the field.
Does it support several TSV files at once?
No. Each conversion creates one clearly bounded worksheet.