CSV to Excel Converter, Turn CSV Into a Real.xlsx Online
Paste CSV or drop a spreadsheet export and download a genuine Excel workbook. The delimiter is auto-detected, a live grid shows exactly what lands in the sheet, and you name the worksheet before you export: all in your browser, never uploaded.
What is the csv to excel?
CSV to Excel converts a pasted or dropped .csv into a real Excel .xlsx workbook, not a renamed file. The delimiter is auto-detected, the parsed grid previews live, and you can name the worksheet before downloading a workbook that opens natively in Excel, Google Sheets and LibreOffice. Free and fully in-browser.
The GigAI CSV to Excel converter turns delimited text into a genuine binary.xlsx workbook without opening Excel, running a macro, or sending your data to a server. Paste CSV, drop a.csv exported from a database, an analytics dashboard or another app, or import a file, and the tool parses it with papaparse: automatically sniffing whether your fields are separated by commas, semicolons or tabs, and correctly handling quoted values, embedded commas and multi-line cells that make a raw CSV open as a single mangled column in Excel. A live grid preview shows exactly what will land in the spreadsheet before you commit, with row and column counts and the detected delimiter shown as badges, so there are no surprises after download. Name the worksheet whatever you like (it is sanitised to a valid Excel tab name for you), then export a real.xlsx file, not a renamed CSV, built with the SheetJS engine so it opens natively in Microsoft Excel, Google Sheets, LibreOffice Calc and Apple Numbers, and imports cleanly into Power BI, pandas or anything that reads the Office Open XML format. Because CSV carries no type or formatting information, every cell is written as its original text so nothing is silently reinterpreted, your leading zeros, long ID numbers and date-like strings survive exactly as they were. Everything runs client-side: financial exports, customer lists and internal datasets never leave your machine, there is nothing to upload or wait for, and closing the tab erases every trace. When you need to go the other way, the sibling Excel to CSV tool flattens a workbook back to plain text with the same nothing-uploaded guarantee.
- Difficulty:
- Easy
- Typical time:
- ~15s
- Processing:
- 100% browser processing
- Converts:
- CSV → XLSX
Last updated
How to use the csv to excel
- 1
Add your CSV
Paste CSV into the editor, drop a .csv file anywhere on the workspace, or click Import. A sample loads in one click if you just want to see how it works.
- 2
Check the live preview
The grid shows exactly what will land in the sheet. Confirm the detected delimiter and the row/column counts match what you expect.
- 3
Name the worksheet
Type a tab name (or keep the default). It's sanitised to a valid Excel sheet name automatically.
- 4
Download the .xlsx
Click Download Excel to get a real workbook file, or copy the parsed data as CSV first if you want to double-check it. Nothing is uploaded at any step.
What CSV to Excel includes
A real .xlsx, not a renamed CSV
SheetJS writes a genuine Office Open XML workbook, so the file opens natively in Excel, Google Sheets, LibreOffice Calc and Numbers. No import wizard, no 'file format doesn't match' warning.
Automatic delimiter detection
Comma, semicolon or tab, papaparse sniffs the separator from your data and handles quoted fields, embedded commas and multi-line cells that make a raw CSV open as one mangled column.
Live grid preview
See the parsed spreadsheet exactly as it will appear in Excel before you download, with row and column counts and the detected delimiter shown as live badges. No surprises after export.
Name your worksheet
Give the tab a meaningful name. It's sanitised to a valid Excel sheet name automatically (invalid characters and length limits handled for you).
Text-safe cells
Every value is written as its original text, so leading zeros, long ID numbers and date-like strings survive exactly as they were instead of being silently reinterpreted.
100% client-side
Parsing and workbook generation happen on your device. Financial exports, customer lists and internal datasets are never uploaded, stored or logged: close the tab and every trace is gone.
Why use our csv to excel
Fixes the 'CSV opens as one column' mess
Excel often mis-guesses the delimiter and crams every field into column A. This converter detects the separator first and writes a properly split .xlsx you can just open.
Preserves data that Excel usually breaks
Because cells are written as text, ZIP codes, product SKUs and 16-digit account numbers keep their leading zeros and exact digits instead of turning into rounded scientific notation.
No Office install, no upload
Produce a native spreadsheet on a locked-down machine or a Chromebook without Excel installed, and without pasting confidential data into a third-party website.
Ready for the whole spreadsheet ecosystem
The .xlsx imports cleanly into Google Sheets, Power BI, Tableau and pandas, so one conversion feeds every downstream tool.
Built for the way you work
From quick one-off fixes to daily workflows, see how people put this tool to use.
- Finance & ops
Turn a system export into a workbook
Convert a CSV dumped by an ERP or accounting tool into a clean .xlsx that opens with columns already split, ready for pivot tables and formulas.
- Data analyst
Hand a stakeholder a spreadsheet
Send a colleague a proper Excel file instead of a raw CSV they'd have to import. The tab is named and the columns are correctly separated.
- Developer
Ship a report as .xlsx
Take a CSV your script generated and produce the .xlsx a non-technical recipient expects, without adding a spreadsheet library to your build.
- Educator / researcher
Prep data for a class or study
Convert a collected CSV into an Excel file that students or co-authors can open natively on any machine, with leading zeros and IDs preserved.
Supported formats
Accepts CSV, TSV and TXT, and produces XLSX, all processed locally in your browser.
- CSV
- TSV
- TXT
- XLSX
Frequently asked questions
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Comparisons & guides
Go deeper on the concepts behind the csv to excel.
CSV vs JSON: Which Data Format Fits Your Job?
ComparisonCSV is a flat, compact table format that spreadsheets love. JSON is a nested, structured format that code and APIs love. How to do it they differ and when to reach for each.
Read the comparisonCSV vs Excel: Which Format for Your Data?
ComparisonCSV is a universal plain-text table. Excel (.xlsx) adds formatting, formulas and multiple sheets. Here's when to use each and how to convert between them.
Read the comparisonHow to Convert CSV to JSON (Free, In Your Browser)
GuideTurn a spreadsheet or CSV export into a clean array of JSON objects, with the right headers as keys and correct data types. A step-by-step guide.
Read the guideCommon problems, solved
Hit a snag? Here are quick fixes for the issues people run into most.
My whole CSV lands in one column in the preview.
The delimiter was mis-detected because the file is mostly one column or uses an unusual separator. Make sure it's genuine CSV/TSV with a consistent delimiter throughout, the sniffer picks comma, semicolon or tab from the data, so a mixed or rare separator can confuse it.
A ZIP code or ID lost its leading zeros in Excel.
This converter writes every cell as text, so the.xlsx it produces keeps leading zeros. If a number still displays trimmed, that's Excel re-guessing the type on open, format the column as Text in Excel, or the exported cell already holds the exact original string.
The sheet name I typed came out changed.
Excel forbids certain characters (: \ / ? * [ ]) and caps tab names at 31 characters. The tool sanitises your name to a valid one automatically, so an over-long or illegal name is trimmed rather than rejected.
The download is slow or the tab feels sluggish.
Very large CSVs take longer to parse and write in the browser. Close other heavy tabs, or split an enormous file into a few smaller CSVs and convert each. Every conversion is local, so there's no upload wait, just processing time.
Get the most out of it
Glance at the detected-delimiter badge before exporting, if it's wrong, your source file probably has an inconsistent separator.
The preview is authoritative: what you see in the grid is exactly what the .xlsx will contain.
Paste tab-separated (TSV) data straight in: tabs are sniffed automatically, no setting to change.
Give the worksheet a descriptive name so the recipient's tab isn't just 'Sheet1'.
Need the reverse? The sibling Excel to CSV tool turns a workbook back into plain CSV, same nothing-uploaded guarantee.
What's new
Recent updates and improvements to the csv to excel.
Initial release: client-side CSV to.xlsx with automatic delimiter sniffing (comma/semicolon/tab), a live grid preview, row/column and detected-delimiter badges, a custom worksheet name, drag-drop/paste/import, copy-as-CSV, download and reset.
Added worksheet-name sanitisation (illegal characters and the 31-character Excel limit are handled automatically) and clarified that cells are written as text to preserve leading zeros.
Improved TSV handling, added a curated set of sample CSVs and surfaced the detected delimiter as a badge so the parse can be verified before export.
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Your privacy is built in
Your CSV is parsed and the Excel workbook is built entirely in your browser. Nothing is uploaded to any server. No data is stored, logged or transmitted, so you can safely convert financial exports, customer lists and internal datasets. Close the tab and every trace is gone.
- Runs in your browser
- No uploads
- Nothing stored
Ready to try the csv to excel?
Free, private and instant. CSV to Excel runs right in your browser.