Spreadsheet converter: Excel, CSV, JSON, Markdown & HTML

Five target formats, one click

Load a file, pick a target format, download. Markdown and CSV output can also be copied straight to the clipboard – handy for docs, READMEs and tickets.

• Input: Excel (.xlsx, .xls), CSV and JSON.
• Output: XLSX, CSV, JSON, Markdown table or HTML table.
• Multiple sheets are exported together.

No upload, no account

Conversion happens entirely in your browser. Your tables are never uploaded or stored – ideal for confidential data too.

Common conversions

Everyday tasks take seconds: convert an Excel file to CSV to import it into another program; open CSV in Excel without breaking accents or number formats; turn JSON from an API into a clean table; or export a table as Markdown to paste straight into a README, wiki or ticket. You can also generate HTML tables for web pages.

All SmashDash tools at a glance

SmashDash brings five free spreadsheet tools together in one place – each runs entirely in the browser, with no upload and no account:

• Turn Excel and CSV into interactive, filterable charts. – Turn Excel and CSV into interactive, filterable charts.
• Design charts with your own values and export them as SVG or HTML. – Design charts with your own values and export them as SVG or HTML.
• Convert Excel, CSV and JSON into XLSX, CSV, JSON, Markdown or HTML. – Convert Excel, CSV and JSON into XLSX, CSV, JSON, Markdown or HTML.
• Remove duplicates and empty rows, normalise number formats. – Remove duplicates and empty rows, normalise number formats.
• Merge, split and compress PDFs and extract tables. – Merge, split and compress PDFs and extract tables.

All processing happens locally in your browser – your files are never uploaded, fully privacy-friendly.