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Multiway Converter

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Supported formats: .csv,.xlsx,.xls,.xlsm,.xlsb,.tsv

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About Multiway Converter

Convert between Excel (XLS, XLSX), JSON, CSV, and TSV formats instantly in your browser. Free universal file converter that handles large datasets, preserves UTF-8 encoding, auto-detects delimiters, and keeps your data private with local-only processing. No file size limits.

Stop struggling with incompatible file formats. The Multiway Converter is your all-in-one tool to transform data between Excel, CSV, JSON, and more.

Unlike simple "Save As" functions, this tool handles encoding issues (UTF-8), delimiter detection, and large file sizes directly in your browser.

Perfect for developers needing JSON for APIs or analysts needing Excel for reporting.

Category: Conversion & Export

Common Use Cases

  • Converting Excel inventory to CSV for a Shopify or WooCommerce bulk import
  • Transforming CSV data to JSON for a web app or API payload
  • Batch converting daily reports between whatever format each downstream system expects
  • Turning a TSV export from a legacy system into a clean CSV or XLSX file
  • Converting a JSON API response into a spreadsheet a non-technical teammate can open

Key Features

  • Auto-detects source format (CSV, TSV, Excel, JSON) from file content, not just extension
  • Preserves data types and UTF-8 characters across the conversion chain
  • Handles multi-sheet Excel workbooks and nested JSON structures
  • No file size cap, runs entirely client-side
  • Any-to-any conversion between CSV, XLSX, JSON, and TSV in a single tool instead of four separate converters

The Multiway Converter tool is compatible with: Excel, Google Sheets, JSON APIs, Legacy Systems.

Use this when the target format is a moving target, e.g. pulling from an Excel export and needing both a JSON payload for an API and an XLSX copy for finance; run the file once here instead of chaining single-purpose converters.

Frequently Asked Questions

Is there a file size limit?

No, it's built to handle large datasets directly in the browser without a hard file size cap.

Does my data get uploaded to a server?

No, all conversion happens locally in your browser, nothing is uploaded.

Which formats can I convert between?

CSV, XLSX/XLS, JSON, and TSV, in any direction, source format is auto-detected from the file content.

Will it preserve special characters and accented text?

Yes, UTF-8 encoding is preserved through the conversion, so accented characters, symbols, and non-Latin text survive the round trip.

Can I convert an Excel file with multiple sheets?

Yes, multi-sheet workbooks are handled; you can choose which sheet to convert or process them together depending on the target format.

What happens to nested data when converting JSON to CSV?

Nested JSON structures are flattened into columns so the result opens cleanly as a normal spreadsheet.

Built for teams juggling exports from multiple systems that never agree on a file format.

Read the related guide →