Spreadsheet Tools
Convert between CSV, Excel and JSON in a click. Upload your file, get the converted version instantly.
About Spreadsheet Tools
Spreadsheet tools exist for one recurring headache: the data is fine, but it is in the wrong format for whatever needs to read it next. An accounting package exports CSV, your colleague wants Excel. A developer needs JSON, but the source of truth is a workbook someone has been maintaining for years. Rather than opening a full office suite and clicking through an export dialog, you can convert the file directly. CSV to Excel turns a plain comma-separated file into a proper .xlsx workbook, Excel to CSV flattens a workbook back into portable text, and Excel to JSON converts rows into structured data an application or script can consume.
Choosing between them is really about who or what reads the file next. Convert to Excel when a person will open it, because a workbook preserves column types and is far friendlier to read and sort. Convert to CSV when a system will read it, or when you need something that any tool on any platform can import without complaint, and when you want to sidestep the formatting quirks that travel with a workbook. Convert to JSON when the destination is code rather than a person, since JSON keeps the column headers as field names and nests cleanly into an API request or a config file. If you are unsure, CSV is the safest common denominator, and you can always convert it onward afterwards.
Unlike our calculators, this conversion cannot happen in your browser, so we should be clear about how it works. The file you pick is uploaded to our server, converted there, and returned to you as a download. While it is with us it sits under a randomly generated name in a directory that is not reachable from the web, it is deleted the moment your download has been served, and any file left behind by an interrupted download is cleared automatically within 30 minutes. It is worth knowing the practical limit too: these are format conversions, so plain values and headers carry over, but charts, macros, formulas and cell styling generally do not survive a trip through CSV or JSON.
Frequently asked questions
Do my spreadsheets get uploaded?
Yes. File conversion cannot run inside a browser, so your file is uploaded to our server, converted and sent back to you as a download.
What happens to the file afterwards?
It is deleted as soon as your download is served. Until then it is stored under a random name in a folder that is not reachable from the web, and anything left by an interrupted download is swept within 30 minutes.
Will my formulas, charts and formatting survive the conversion?
Generally no. CSV and JSON are plain data formats, so values and column headers carry over but formulas, charts, macros and cell styling do not.
Which format should I convert to?
Excel if a person will open and read it, CSV if another system needs to import it or you want maximum compatibility, and JSON if the destination is code, a script or an API.