Excel Converter Online
Open, Convert And Build Workbooks

What An Excel Converter Online Can Do For You

A spreadsheet is easy for people to read. But code wants JSON, CSV or XML. So sooner or later you need to move data out of Excel, or back in again.

This tool does both. Drop in an .xlsx file and you see the sheet at once. Then pick a format and the converted text appears beside it. Copy it, or save it as a file.

Going the other way is just as simple. Paste JSON, CSV, XML, YAML or an HTML table. The tool builds a real workbook with typed cells. Then you download a file that Excel, Google Sheets and LibreOffice open without a fuss.

Everything happens in your browser. The workbook never travels to a server. That matters, because spreadsheets often hold customer lists, prices and payroll.

Think about a normal week. A client sends a price list as an Excel file. Your app needs JSON. Instead of writing a script, you drop the file here and copy the result. Later, your app exports a report as JSON. Your manager wants it in Excel. You paste it here and download the workbook. Both jobs take less than a minute.

Excel To JSON Converter Online

First, choose JSON and every row becomes an object. Then the first row of the sheet gives the keys. Numbers stay numbers, true and false stay booleans, and empty cells become null.

Also, you can pick a list of lists instead. That output keeps the grid shape and has no keys. So it suits charts and quick scripts.

This is the xlsx to json converter most people look for. It reads the real file, so you skip the save-as-CSV step and its encoding trouble.

For more detail, see: Ecma-376, the Office Open XML standard.

Excel Viewer Online Without Excel

You do not need Excel to look inside a workbook. Open the file and the sheet appears with column letters and row numbers, just like the real thing.

Next, pick another sheet from the list, and the view changes. Hidden sheets show up too, with a label. So nothing stays out of sight.

This excel viewer online reads values. It does not run macros, and it does not draw charts or pictures. That is why it is safe as well as limited.

Excel To CSV, XML, YAML And More

The same sheet can leave in nine shapes. JSON comes first, then CSV with commas, CSV with semicolons, and TSV. After that come XML, YAML, an HTML table and a Markdown table.

Semicolon CSV matters in much of Europe. There, Excel uses the comma as a decimal mark, so a comma file breaks. So the semicolon option solves it.

Besides that, the CSV writer guards against formula injection. A cell that starts with an equals sign gets a safe prefix. So a spreadsheet will not run it by surprise.

JSON, CSV And XML To Excel

Switch to the second mode to build a workbook. First, paste your data, or open a file. Then the tool detects the format for you.

JSON that holds several lists becomes several sheets. An HTML page with several tables does the same. Also, nested objects flatten into dotted column names, such as address.city.

Then you choose the extras. You can shade and freeze the header, add filter buttons and fit the column widths. Finally, you press download and get an .xlsx file.

Dates, Formulas And Big Numbers

Excel stores a date as a number. The tool reads the cell format, so a date comes out as clear ISO text, such as 2026-10-02. A time stays a time.

Next, formula cells show the result Excel saved. The tool never runs a formula. In the other direction, text that starts with an equals sign stays text. It never turns into a live formula.

Numbers with more than fifteen digits stay as text when you build a workbook. Excel keeps only fifteen, so this protects every digit of an order or card number.

Merged Cells And Hidden Sheets

A merged cell keeps its value in the top left corner. Then the other cells in the range stay empty. The notes under the table tell you how many merges the sheet has.

If a header name repeats, the tool adds a number, such as total_2. So no key ever overwrites another.