Free Online Spreadsheet Tools
Convert between CSV, Excel, and JSON formats.
Browse every free spreadsheet tools on FileToolsHub. Open a tool to upload or paste your input, run the action, and download or copy the result — no installation and no paid plan required for everyday use.
6 free online tools
Free online spreadsheet tools
Move data between CSV, Excel, and JSON formats in seconds. FileToolsHub spreadsheet tools parse your upload and produce a clean download you can open in Excel, Google Sheets, or import into databases and APIs.
Whether you export from a SaaS product as CSV or need JSON for a config file, these converters save manual copy-paste and formatting errors.
Teams use CSV to Excel when an export opens as a single column mess, Excel to JSON when wiring UI fixtures or API mocks, and JSON to CSV when analysts need a flat table. Keep headers clean and consistent for best results.
All spreadsheet converters are free and unlimited. Upload the source file, run the conversion, and download the output in the format your next system expects.
- Open CSV exports in Excel with proper columns
- Convert Excel reports to JSON for APIs
- Turn JSON arrays into spreadsheet rows
- Prepare data migrations between systems
- Share tabular data without proprietary formats
- Build quick fixtures for frontend or backend tests
All spreadsheet tools
Excel to CSV
Convert Excel (.xlsx/.xls) spreadsheets to CSV for imports, databases, and legacy systems — UTF-8 friendly plain text export.
CSV to Excel
Convert CSV files to Excel (.xlsx) format.
Excel to JSON
Convert Excel (.xlsx/.xls) worksheets into a JSON array of row objects — ideal for API fixtures, imports, and frontend mocks.
JSON to Excel
Convert JSON data to Excel spreadsheets.
CSV to JSON
Convert CSV files to JSON format.
JSON to CSV
Convert JSON arrays to CSV format.
Looking for something else? Browse the full sitemap.
Why use FileToolsHub for spreadsheet tools?
FileToolsHub keeps spreadsheet tools in one place so you do not bounce between unrelated converter sites. Each tool page explains how the workflow works, lists benefits, and answers common questions so you can finish the job without searching for instructions.
When you need a different format or a follow-up step, related tools and category links make it easy to continue — for example merge then compress, or format JSON then validate. Browse the sitemap if you want a full alphabetical-style list by category.
Every tool in this category is free for unlimited everyday use. Prefer mobile? The same pages work in phone and tablet browsers so you can convert a file or format text when you are away from your desktop.