Convert CSV to Excel online
Convert Comma-Separated Values files to Excel Workbook (Office Open XML Spreadsheet) instantly in your browser — free, private, and with no account. Files never leave your device: the Comma-Separated Values → Excel Workbook (Office Open XML Spreadsheet) pipeline runs entirely on your machine.
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Browse files · CSV to Excel · Up to 25 MB each (max 20 files)
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Why convert Comma-Separated Values to Excel Workbook (Office Open XML Spreadsheet)?
Converting Comma-Separated Values to Excel Workbook (Office Open XML Spreadsheet) moves your content between two document ecosystems without uploading anything — the file is parsed, transformed, and rebuilt inside this browser tab. Dead-simple structure, negligible file size, importable by Excel, Google Sheets, pandas, and virtually every data tool in existence. Formulas and calculated fields, multiple sheets per file, rich number formatting and conditional styles, and native handling by Excel and Google Sheets.
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Guide
About Comma-Separated Values and Excel Workbook (Office Open XML Spreadsheet)
Comma-Separated Values (Comma-Separated Values) — CSV is the lowest common denominator of tabular data: one row per line, values separated by commas. Spreadsheet apps, databases, and scripts all speak it.
Excel Workbook (Office Open XML Spreadsheet) (Excel Workbook (Office Open XML Spreadsheet)) — XLSX is the Microsoft Excel workbook format since Office 2007. A single file can hold multiple sheets, formulas, charts, pivot tables, and formatting.
Guide
When this conversion makes sense
Reach for this conversion when your content currently lives as Comma-Separated Values — data export/import, contact lists, analytics datasets, database snapshots, and moving tables between systems that share nothing else. — and the destination needs Excel Workbook (Office Open XML Spreadsheet): budgets, financial models, reports with multiple tabs, data analysis with formulas, and stakeholder-facing spreadsheets.
Keep the source in mind: Only one table per file, no formatting or formulas, and awkward handling of commas, quotes, or multi-line text without careful escaping. Meanwhile, Excel Workbook (Office Open XML Spreadsheet) solves that with this strength: Formulas and calculated fields, multiple sheets per file, rich number formatting and conditional styles, and native handling by Excel and Google Sheets.
Guide
What to expect from the output
This converter runs fully client-side — no upload, no server storage, no watermark. Drop files in, preview the result, and download individually or as a batch ZIP.
Because Comma-Separated Values and Excel Workbook (Office Open XML Spreadsheet) were designed for different jobs, expect structure to map cleanly but presentation details to adapt: Only one table per file, no formatting or formulas, and awkward handling of commas, quotes, or multi-line text without careful escaping.
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Frequently asked questions
Is this Comma-Separated Values to Excel Workbook (Office Open XML Spreadsheet) converter free?+
Yes. All document conversions are completely free with no sign-up, no watermarks, and unlimited usage.
Are my files uploaded to a server?+
No. All conversion happens in your browser using local JavaScript libraries. Your files are never uploaded, never stored, and never visible to anyone but you.
What quality can I expect from Comma-Separated Values to Excel Workbook (Office Open XML Spreadsheet)?+
Structural elements — headings, paragraphs, lists, tables — convert faithfully. Highly customized visual styling may adjust to what the target format supports natively.
Can I convert Comma-Separated Values files in batches?+
Yes. Drop multiple Comma-Separated Values files at once and they convert in sequence; download results individually or grab the whole batch as a single ZIP file.