Paste CSV or open a .csv file and download a real .xlsx workbook: numbers stored as numbers, zip codes and IDs with leading zeros kept as text, UTF-8 accents intact, and a header row with filters and fitted column widths. Semicolon and tab files are detected. Nothing is uploaded.
Open a file: (or drop it on this box)
Preview
Double-clicking a CSV lets Excel guess: 01234 loses its leading zero, a 16-digit card or order number turns into 1.23457E+15, MARCH1 or 1-2 becomes a date, and a UTF-8 file without a BOM shows é for é. This converter decides each value once, conservatively: plain numbers like 12.50 are stored as numbers (so SUM works), and anything that would change, such as leading zeros, long IDs, 1,000 or dates, is stored as text exactly as written. The choice is made per column, so one 01234 keeps the whole zip column as text.
One sheet named Sheet1, the header row with AutoFilter on, and column widths fitted to the first 200 rows. Turn off "Detect numbers" to store every cell as text.
Once the rows are in shape, CSV to PDF and Excel to PDF print them as a table that fits the page. From code, the Shotmint API renders any HTML table: POST https://shotmint.creasework.com/v1/pdf with {"html": "<table>…</table>"} returns a PDF with the header repeated on every page, and /v1/screenshot with "selector": "table" returns a PNG of just the table (1 credit each; 25 free renders a month, then €5 for 2,000 that never expire). Scripts, AI agents and Make or Zapier can get a key with a bare POST https://shotmint.creasework.com/v1/keys/free.
Get 25 free renders a month API docs
Is my file uploaded? No. Parsing and conversion run in your browser (spreadsheets are read and written with SheetJS, loaded only when needed); this page sends nothing to a server, so it works for private data.
Can it convert the other way? Yes: every page reads CSV, JSON and spreadsheets, and the "Convert to" menu picks the output. Related: CSV to JSON, JSON to CSV, Excel to CSV, JSON to Excel, Excel to JSON, CSV to Markdown, Excel to Markdown, Markdown table to CSV.
Excel to CSV · Excel to PDF · PDF to Excel · Excel to JSON Converter · Excel to Markdown Table · JSON to Excel Converter · JSON to CSV · CSV to JSON · CSV to Markdown table · CSV to PDF Converter · Markdown Table to CSV Converter · PDF to CSV Converter · all free tools