Conversion uses SheetJS (xlsx) in your browser. CSV files are not uploaded to EverydayTools servers. Preview shows a subset of rows; very large files may be slow on mobile. Enable “Treat all values as text” to preserve leading zeros in Excel.
Free online CSV to Excel converter — upload or paste CSV and download a real .xlsx workbook. Preview the first 25 rows, auto-detect comma/semicolon/tab/pipe delimiters, and preserve leading zeros in IDs. SheetJS runs locally; files never leave your device.
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CSV to Excel turns comma-separated text into an .xlsx workbook using SheetJS in your browser — preview rows, pick or auto-detect delimiters, and download without uploading files to a server.
A CSV to Excel converter parses plain-text CSV (comma, semicolon, tab, or pipe separated) and writes a real Office Open XML (.xlsx) file you can open in Excel, Google Sheets, or LibreOffice.
This tool runs entirely in your browser with SheetJS. Upload or paste CSV, review a 25-row preview, confirm delimiter and encoding stats, then download .xlsx. Enable **Treat all values as text** to keep leading zeros in customer IDs, ZIP codes, and SKUs.
Limits: 10 MB per file, 200,000 rows. UTF-8, UTF-8 BOM, and UTF-16 encodings are detected on file upload.
Concise answers for common searches — definitions, steps, and comparisons.
Upload or paste your CSV, review the preview table, then click Download Excel (.xlsx). Conversion runs in your browser with SheetJS — no account and no server upload.
Use this tool: files are read with the browser FileReader API and converted locally. Your data never leaves your device during conversion.
US/UK exports usually use commas; many European exports use semicolons. Tabs appear in TSV exports; pipes in some data feeds. Use Auto-detect or match what you see in the preview columns.
Enable “Treat all values as text” before downloading. Excel otherwise may convert values like 000418 to numbers and drop leading zeros.
Opening .csv in Excel triggers locale guessing (dates, decimals, IDs). Converting to .xlsx first with text cells avoids many of those surprises.
Yes — no signup, no upload to a server, and no usage cap within the 10 MB / 200k row browser limits. Convert CSV file to Excel as often as you need.
Yes. The output is standard Office Open XML (.xlsx) — compatible with Microsoft Excel, Google Sheets, LibreOffice Calc, and Apple Numbers.
Yes — 10 MB per file and 200,000 rows in the UI. Larger exports may hit browser memory limits; split the CSV or filter rows first.
Your CSV is read locally (with UTF-8/UTF-16 BOM detection on files). A delimiter auto-detector scores comma, semicolon, tab, and pipe on the first data row. Rows are parsed with RFC 4180-style quote rules so commas and newlines inside quoted fields stay in one cell. SheetJS builds a one-sheet .xlsx; when “Treat all values as text” is on, every cell is written as a string so Excel does not strip leading zeros.
Drag a .csv or .txt file onto the upload area, or paste CSV text. Encoding (UTF-8, UTF-8 BOM, or UTF-16) is detected automatically for files.
Check the first 25 rows, row/column counts, detected delimiter, and estimated .xlsx size before downloading.
Leave delimiter on Auto-detect or choose comma, semicolon, tab, or pipe. Keep “Treat all values as text” enabled to preserve leading zeros in IDs and ZIP codes.
Click Download Excel to generate Sheet1 and save your file. The output name matches your CSV filename with a .xlsx extension.
Input
CSV: name,address,total
"Acme Inc","12 Main St, Suite 3",1299.50Output
XLSX with 3 columns; address stays in one cellQuoted fields keep internal commas intact. Preview the table before download to confirm columns.
Input
CSV: customer_id
000418
000419Output
XLSX text cells showing 000418 (not 418)Enable Treat all values as text so SheetJS writes string cells Excel will not auto-trim.
Input
CSV: name;amount
Product;19,99Output
XLSX with semicolon parsing when delimiter is set or auto-detectedAuto-detect scores column counts per delimiter on the first row.
Common real-world scenarios where this tool saves time.
Turn SaaS CSV exports into .xlsx files that open cleanly in Excel without delimiter warnings.
Convert large CSV datasets to XLSX for filtering, charts, and pivot tables in Excel or Sheets.
Avoid Excel mangling transaction IDs and dates by converting with text preservation first.
Pair with Excel to CSV when you need to edit in Excel and export CSV again.
Step-by-step chains that connect related tools for common tasks.
Edit in Excel, export CSV, or convert CSV back to Excel.
| Approach | Best for | Trade-off |
|---|---|---|
| This converter (CSV → XLSX) | IDs, quoted fields, preview before save | Single sheet output |
| Open .csv directly in Excel | Quick peek at small files | Dates/IDs may auto-format wrong |
| Excel to CSV (reverse) | Export from existing workbook | Loses formulas from source xlsx |
| Delimiter | Common source | Example |
|---|---|---|
| Comma (,) | US/UK default CSV | name,email,total |
| Semicolon (;) | EU locale CSV | name;email;total |
| Tab | TSV / spreadsheet export | name email total |
| Pipe (|) | Logs, some APIs | name|email|total |
Check the preview. Switch from Auto-detect to the delimiter that matches your export.
Keep “Treat all values as text” enabled before download.
Re-export the CSV as UTF-8 from the source system. The tool detects UTF-8 BOM and UTF-16 on upload.
Convert to .xlsx here with Treat as text instead of using Excel’s Text Import Wizard on raw CSV.
Likely cause: Delimiter does not match the file, or quotes are broken in the source CSV.
Fix: Try another delimiter in the dropdown and watch the preview update. Re-export from the source with proper quoting.
Likely cause: Very large files (hundreds of thousands of rows) stress browser memory.
Fix: Split the CSV, filter rows at the source, or convert a sample first to validate settings.
Likely cause: Browser blocked the download or the file is empty after parsing.
Fix: Ensure the preview shows rows. Try again after clicking Download Excel (user gesture).
Likely cause: Browsers may not fire change when re-selecting the same path.
Fix: Click Clear, then select the file again — the input resets on each pick.
Upload or paste CSV, review the preview, and click Download Excel (.xlsx). No signup. Conversion runs locally in your browser.
No. Files are read and converted with SheetJS in your browser. Data is not sent to EverydayTools servers.
Yes. The parser follows standard CSV quoting so addresses and descriptions with commas remain single cells.
Enable “Treat all values as text” (on by default). This writes string cells so Excel does not convert 000418 to 418.
CSV is plain text with delimiters. XLSX is a structured Excel workbook (ZIP + XML) that opens with consistent columns and supports Excel features after conversion.
Up to 10 MB and 200,000 rows in the UI. Larger files may fail due to browser memory.
Yes. File upload detects UTF-8, UTF-8 BOM, and UTF-16 LE/BE. Pasted text uses UTF-8 from your clipboard.
Use the Excel to CSV tool to export .xlsx or .xls files to CSV with delimiter options.
CSV data is processed locally with SheetJS in your browser. Files are not uploaded to EverydayTools servers.
Output depends on delimiter choice and the Treat as text option. Always spot-check the preview before sharing the workbook.
FileReader reads your CSV; SheetJS builds the .xlsx workbook on your device. Preview uses only the first 25 rows for speed.
Review converted workbooks before financial or regulatory use. This tool does not validate business rules or totals.
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Reviewed on 2026-06-03.
Need the reverse? Excel to CSV · CSV to JSON
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