CSV to Excel

This free CSV to Excel converter turns a CSV file into a real .xlsx spreadsheet entirely in your browser. Paste your data or upload a .csv file, check the preview, and download the workbook. Nothing leaves your device, and there is no sign-up.

CSV looks simple, but it has dialects. The same file can be separated by commas, semicolons, tabs or pipes; it can arrive as UTF-8, UTF-16 or a legacy code page; and its first row may or may not be a header. Get any one of those three wrong and every column shifts. This page shows you all three explicitly, and tells you how many columns the first row resolved to before you download.

How to use this CSV to Excel converter

• Paste your CSV into the box, or upload a .csv, .tsv or .txt file.
• Leave Delimiter on Auto-detect and the tool reports which separator it found, or pick one yourself — including a custom character such as ^ or ~.
• Pick the Encoding if your file is not UTF-8. Auto detects a byte-order mark; choose GBK, Latin-1, Windows-1252, Shift_JIS and others for older exports.
• Keep First row is header on when your file has column names; turn it off and the tool generates Column 1, Column 2… and keeps every line as data.
• Optionally set a Sheet name; it defaults to Sheet1.
• Click Convert to Excel, check the preview, then Download .xlsx.

What this tool supports

Delimiters

Comma, semicolon, tab and pipe are detected automatically by counting separators outside quoted text on the first lines of the file — the delimiter that appears the same number of times on every line wins, which is why a stray comma inside a company name does not confuse it. Any single custom character works too. You always see which delimiter was used, and you can override it.

Encodings

UTF-8, UTF-16 LE and UTF-16 BE are recognised from the byte-order mark. If your export opens with broken characters, switch the encoding to ISO-8859-1, Windows-1252, GBK, Big5, Shift_JIS, EUC-KR or KOI8-R. The tool counts undecodable characters and warns you when the chosen encoding does not match the file, instead of silently handing you garbage.

Headers

With First row is header on, the first line becomes the column names; blank names become Column N and duplicates are made unique. With it off, every line is treated as data and the columns are named automatically — useful for headerless exports and log files.

Quoted fields

Fields wrapped in double quotes are handled as one value: commas, semicolons and even line breaks inside quotes stay inside the cell. A doubled quote "" is read as a literal ". Both Windows CRLF and Unix LF line endings are accepted.

Values

• Numbers become real numbers, so they sort and calculate correctly.
• Leading-zero strings — 007, 01234 — stay text, so zip codes, phone numbers and fixed-width IDs keep their zeros.
• Digit strings longer than 15 characters stay text, so long identifiers are not rounded by floating-point precision.
• Values starting with = or @ are kept as text, so imported data can never be evaluated as a spreadsheet formula.
• Dates are not guessed. CSV dates are ambiguous between regional formats, so they stay exactly as written.
• Switch Values to All as text when you want every cell stored verbatim.

Privacy

Uploaded files are read with the browser's own file reader and never leave your device. There is no upload endpoint on this page, no account, and no stored history. You can disconnect from the internet after the page loads and it will still work.

Using your file in spreadsheet software

Open the downloaded .xlsx by double-clicking it, or from inside Excel, Google Sheets, Numbers, or LibreOffice via File → Open. The first row holds the column names and each following row is one record. Because it is a real spreadsheet file, you can sort, filter, chart, and re-save it like any other workbook — unlike opening a .csv directly, which leaves every column as text and drops the number formats.

Spreadsheet apps cap the number of rows per sheet. If your data exceeds that cap, the limit is the spreadsheet app's, not this converter's; the converter itself imposes no row limit and works in your browser's memory.

FAQ