CSV to Excel: Convert UTF-8 CSV to xlsx Online

2026-07-06

  • Excel
  • CSV
  • import
  • xlsx
  • UTF-8
  • online tool
  • tutorial

When you need CSV to Excel

A .csv arrives with garbled Chinese or broken columns when opened; or you need merge, dedup, or SQL export—those flows work better with xlsx. ComTools CSV to Excel (Tools/Excel/CsvToExcel) uploads CSV and returns a standard .xlsx workbook.

Conversion rules

Item Details
Input .csv only
Encoding Read as UTF-8 with BOM auto-detection
Delimiter Comma , (simple parse; trim surrounding quotes)
Output Single-sheet .xlsx (Sheet1)
Layout CSV row 1 → Excel row 1

Steps

  1. Open CSV to Excel.
  2. Select a UTF-8 (or BOM) .csv file.
  3. Click Convert.
  4. Download .xlsx and verify columns and text in Excel.

Common scenarios

Scenario Next
Fix garbled view Confirm encoding after xlsx export
Join merge Convert to xlsx first
Dedup / format Remove duplicates, format
Database Excel to SQL or import guide
JSON Excel to JSON

Encoding troubleshooting

Symptom Fix
Still garbled Source may be GBK—re-save as UTF-8
Wrong columns Unescaped commas—quote fields in source CSV
Odd first column BOM handled; usually harmless

See CSV import tips for more.

Notes

  • CSV input only—use Excel tools directly for xlsx.
  • One sheet per CSV—split multi-table data into files.
  • Complex CSV (embedded newlines, custom delimiters) may need Excel “From Text” then save xlsx.
  • Server-side conversion—mind data sensitivity.

Round trip with Excel to CSV

Excel → CSV → edit elsewhere → CSV to Excel → continue in ComTools

Workflow

UTF-8 CSV download → CSV to Excel → dedup → SQL INSERT → test DB

FAQ

GBK CSV?
Tool reads UTF-8; convert GBK to UTF-8 first.

Semicolon delimiter?
Comma parser only—import in Excel or use text format.

Multiple sheets?
One CSV → one sheet; use multiple files or merge.

vs Excel From Text?
Same goal—quick xlsx for the ComTools pipeline.

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