Does it auto-detect the delimiter?

Yes. Commas, semicolons, and tabs are auto-detected. You can also specify manually.

Can I convert TSV files too?

Yes. Tab-separated files (.tsv) are fully supported — just select the tab delimiter.

Yes. The first row is detected as a header and given bold formatting and a light background.

UTF-8 encoding is fully supported, including international characters and emoji.

No row limit beyond the file size restriction. Excel itself supports up to 1,048,576 rows.

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Import CSV data into a formatted Excel (.xlsx) workbook — complete with auto-sized columns, entirely in your browser.

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1Drop your CSV file onto the converter above, or click to browse and select a file.
2Adjust any conversion options such as output format, quality, or delimiter settings.
3Click the Convert button. The file is processed instantly in your browser.
4Download your converted XLSX file. Your original file is unchanged.

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Your files never leave your device. All processing happens in your browser using WebAssembly.

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No upload wait times, no server queues. Conversion starts immediately and completes in seconds.

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Single-file conversion is always free with no account required. Upgrade for batch processing and more.

Does it auto-detect the delimiter?: Yes. Commas, semicolons, and tabs are auto-detected. You can also specify manually.
Can I convert TSV files too?: Yes. Tab-separated files (.tsv) are fully supported — just select the tab delimiter.
Are column headers styled?: Yes. The first row is detected as a header and given bold formatting and a light background.
What happens with special characters?: UTF-8 encoding is fully supported, including international characters and emoji.
Is there a row limit?: No row limit beyond the file size restriction. Excel itself supports up to 1,048,576 rows.