Batch Convert Spreadsheets
Convert multiple Excel / CSV files at once. Free users: up to 3 files per batch, max 10 MB per file. Pro users: unlimited.
Click or drag files here (.xlsx, .xls, .csv, .tsv)
xlsx output preserves sheet protection, editable ranges, sparklines and charts; xls/csv/tsv do not support these.
How batch conversion works
- Add multiple files at once — mix xlsx, xls, csv, and tsv freely.
- Choose the target format for the whole batch.
- Click Convert; each file is processed locally and downloaded as it finishes.
When batch conversion helps
Standardizing folders — Turn a mixed folder of legacy .xls and .csv files into uniform modern .xlsx.
Data pipelines — Convert incoming xlsx attachments to CSV for systems that only accept plain text.
One-off migrations — Move a whole archive between formats without opening each file by hand.
Picking the right output format
- .xlsx — the modern default. Choose it to normalize mixed inputs (.xls, .csv, .tsv) into one up-to-date format that every current spreadsheet application opens natively.
- .xls — the legacy Excel 97-2003 format, kept for old ERP systems, accounting packages, and hardware that refuse anything newer.
- .csv — plain comma-separated text for databases, scripts, and web imports. Only the first sheet is exported, and all formatting is dropped.
- .tsv — tab-delimited text, handy when the data itself contains commas and you want to avoid quoting issues.
One-off conversions and related tools
This page is built for batches. If you only need one specific conversion, or a different kind of cleanup altogether, a dedicated tool is quicker:
- XLS to XLSX — upgrade a single legacy .xls file to the modern format.
- ODS to XLSX — convert OpenDocument spreadsheets coming from LibreOffice or OpenOffice.
- XLSX to CSV — export one sheet as CSV without running a batch job.
- Compress Excel — when the real goal is smaller files rather than a different format, shrink images and unused data instead.
- Analyze Excel data — profile a workbook's row counts, columns, and data types before deciding what to convert.
What is preserved during conversion
Cell values, dates, and number formats carry over to every output format. When the target is .xlsx, native sparklines are parsed from the source file and re-injected into the converted workbook, so in-cell charts keep rendering. Sheet protection settings are not carried into .xlsx output, so review sensitive files before sharing the results.
CSV and TSV are deliberately lossy: they keep only the values of the first sheet, with no formulas, styles, or additional tabs. Convert to .xlsx instead if you need the full workbook structure. Everything runs locally in your browser — files are converted in memory and delivered as one zip archive, never uploaded to a server.
Frequently asked questions
How many files can I convert at once?
Free users can batch up to 3 files per run; Pro is unlimited.
Are formulas recalculated during conversion?
Formulas are preserved as formulas when converting between workbook formats; converting to CSV writes the last calculated values.
Do converted files keep their names?
Yes — each output keeps the original file name with the new extension.
Why does my converted CSV contain only one sheet?
CSV and TSV are single-table text formats with no concept of tabs. The converter exports the first sheet of each workbook; choose .xlsx output if you need every sheet preserved.
Is there a file size or batch limit?
Free users can convert up to three files at a time, each no larger than 10 MB. Upgrading removes both limits, subject only to your device's memory.
Will converting change my data?
Values, dates, and number formats survive the conversion. Formulas are kept when the target format supports them (.xlsx, .xls); plain-text formats store the last calculated results instead.