File & Data
How to Convert CSV to Excel in Your Browser
CSV files are the lowest-friction way to share tabular data, but many teammates still need an Excel workbook they can filter, format, or email. Looty Tools CSV to Excel converts a .csv file into a real .xlsx workbook entirely in your browser. This guide covers the workflow, delimiter options, preview checks, and the limits to plan around.
Ready to try the tool this guide describes?
When CSV to Excel helps
Use this tool when you have a plain-text table—exports from CRMs, finance systems, or scripts—and need an Office Open XML spreadsheet without installing desktop converters.
The result is a single worksheet workbook with the parsed CSV rows. It is not a full recreation of advanced Excel features such as charts, pivot tables, or macros.
Supported inputs and limits
Choose one .csv file up to 25 MB. Empty files and files with no usable rows are rejected. MIME type alone is not trusted; the .csv extension is required.
- Supported extension: .csv
- Maximum file size: 25 MB
- One file per conversion
- Delimiter options: Auto-detect, Comma, Semicolon, Tab, Pipe
How to convert on Looty Tools
Auto-detect inspects the first nonblank records while respecting quoted fields, then passes the chosen delimiter to SheetJS. If detection is ambiguous, comma is preferred and shown in the preview.
- Open CSV to Excel at /tools/csv-to-excel.
- Choose or drop a .csv file.
- Review the detected delimiter, row and column counts, and preview table.
- Set the worksheet name and optional settings (headers, auto-size columns, preserve as text).
- Select Convert to Excel to generate and download the .xlsx file.
Options that matter
First row contains headers affects preview labeling and column-width weighting only. It does not remove the first row, and the exported workbook does not apply bold header styling.
Preserve values as text keeps leading zeros and many date-like strings as text. When it is off, SheetJS may infer numbers and booleans.
How to Convert CSV to Excel FAQ
- Do I need Microsoft Excel installed to convert?
- No. Conversion runs in the browser and downloads an .xlsx file you can open later in Excel, Sheets, or similar apps.
- Can I convert multiple CSV files at once?
- Not in this release. Convert one CSV file at a time.
- Which delimiters can I choose?
- Auto-detect, comma, semicolon, tab, and pipe are supported. Auto-detect inspects the first nonblank records while respecting quoted fields.
- Does the first-row headers option bold cells in Excel?
- No. It only affects preview labeling and column-width weighting. The exported header row is not styled bold.
- Where should I read next about CSV to Excel?
- See /guides/csv-to-excel-without-uploading for privacy details and /guides/preserve-leading-zeros-csv-to-excel for padded ID values. Open the tool at /tools/csv-to-excel when you are ready.
Related guides
- CSV to Excel Without UploadingLearn how browser-based CSV to Excel keeps table data on your device, what still leaves the machine, and how local conversion differs from upload services.
- Preserve Leading Zeros in CSV to ExcelKeep ZIP codes, account IDs, and other padded values intact when converting CSV to Excel by enabling preserve-as-text mode before download.
- Browser-Based File PrivacyUnderstand local browser processing, when files stay on your device, practical privacy checks, and how Looty Tools discloses different processing models.