Spreadsheet Converter

Free online spreadsheet converter running entirely in your browser. No files uploaded, no signup required — convert CSV and XLSX sheets in one click.

Conversions

About Spreadsheet Converter

Our Spreadsheet Converter allows you to convert between Excel sheets and database-ready data formats locally in your browser. Your sensitive financial or customer sheets never touch our servers. Supported formats include XLSX and CSV. Perfect for preparing data for software import or exporting databases into visual spreadsheets.

Best for

  • Converting Excel sheets to database-ready CSVs
  • Saving CSV reports as XLSX for formatting
  • Preparing data tables for import into software
  • Quick local sheet conversions

Pros

  • +Protects sensitive financial data locally
  • +Fast parsing and clean CSV exporting
  • +No rows or file limits during local runs
  • +Supports multi-sheet workbook processing

Cons

  • −Does not support legacy XLS formats
  • −Macro scripts (VBA) are not preserved
  • −Formatting styles are lost when converting to CSV

How to convert with the Spreadsheet converter

  1. 1

    Choose the spreadsheet files you want to convert from your device, or drag and drop them here.

  2. 2

    Select your desired output spreadsheet format from the dropdown menu (e.g. XLSX, CSV).

  3. 3

    Optional: click the gear icon to adjust cell delimiters, encoding, or sheet tabs.

  4. 4

    Click the Convert button and download your converted spreadsheets instantly.

Supported Formats

Frequently Asked Questions

Is the spreadsheet converter free?
Yes, it is 100% free to convert Excel and CSV sheets with no row limits.
Is my financial or client data secure?
Yes. All sheet parsing and exporting run locally in your tab, so your data never touches our servers.
Does it support Excel formulas?
Formulas are evaluated and their static values are exported when converting to non-Excel formats like CSV.
Can I convert on mobile?
Yes for typical CSV/XLSX sizes; huge workbooks prefer desktop.
Is Unicode text preserved?
Yes. UTF-8 friendly flows preserve international characters.
Do files stay private?
Yes. Sheet conversion is local in your browser.
FREE

100% Free

No hidden fees, no subscriptions, and no limits. Enjoy complete access to all features gratis.

SIGNUP

No Signup Required

Start converting immediately without creating an account or sharing email address.

PRIVACY

Private & Secure

Your files never leave your device. All processing is completed locally for maximum privacy.

BATCH

Batch Conversion

Convert multiple files simultaneously to save time. Fast and efficient multi-file queue.

LOCAL

Runs in Browser

Utilizes advanced client-side WebAssembly technology to process files directly inside your tab.

FORMATS

200+ Formats

Supports a wide variety of formats including images, documents, audio, video, and more.

USER REVIEWS

Spreadsheet Converter Quality Rating

4.8
25 reviews

How was your experience? You need to convert and download at least one file to provide feedback!