Our basic product converts Excel spreadsheets to HTML with embedded JavaScript that can be used with any web server. The smartphone version converts Excel for iPhone and Android. For developers, there are special server products that generate program code for Node.js web servers.

SpreadsheetConverter creates web pages that mimic the behavior of Excel spreadsheets. Depending on the requirements, the calculation of the formulas in the spreadsheet can be performed either in the web browser or on a web server. The converted web page itself looks exactly the same regardless of what flavor of SpreadsheetConverter you used to create it.


Running the formulas in the web browser

If the spreadsheet formulas are calculated in the web browser, the whole spreadsheet can be placed very neatly in one single package sent to the browser.


  • This is normally the fastest method, since there is no network communication after the web page has been downloaded to the browser.
  • All cell values can be updated immediately after leaving an input field.
  • The web page can be served from any web server, there are no special dependencies on the web server whatsoever.
  • Since the server is not involved in the rendering of the web page, performance is only limited by each user’s technical environment.
  • The web page can be used offline, even if you’re not connected to the Internet.


  • Client-side calculations can be slow for large spreadsheets with many formulas.
  • The web page contains all the programming code that performs the formula calculations. This makes can make the download slower. It can also impact the use of the spreadsheet with smaller devices like handheld computers or smartphones.
  • The web page cannot interact dynamically with databases and other real-time data sources on the server.

SpreadsheetConverter HTML

SpreadsheetConverter HTML converts an Excel spreadsheet into an HTML web page that uses embedded JavaScript code to calculate the formulas. You don’t need any programming or web design skills to use SpreadsheetConverter HTML. The result of the conversion is a portable web calculator or smart form that works on all devices and fluidly adapts to the screen size of any smartphone, tablet or laptop.

Read more about the HTML flavor.

Decide if you need the Standard or Professional edition.

Download and test SpreadsheetConverter for free for 30 days.

Explore prices and buying options.

SpreadsheetConverter iPhone/Android

SpreadsheetConverter iPhone/Android is a specialized app-builder that converts an Excel spreadsheet for iPhone and Android smartphones. Mobile calculators can be used also when the smartphone is offline, and your electronic forms are automatically stored until the phone is online again.

Read more about the iPhone/Android flavor.

Decide if you need the Standard or Professional edition.

Download and test SpreadsheetConverter for free for 30 days.

Explore prices and buying options.


Build powerful web forms with Excel

This developer is using Excel to create a membership application form, and previewing the form on a Sony Xperia smartphone.

You only need basic Excel skills to develop powerful web forms.

  • Use the iPhone/Android flavor to fully utilize touch screens.
  • Use the HTML flavor for a responsive design that adapts to the width of each screen.

Connect the form to our forms processing options – receive each form by e-mail, or saved in a database hosted by us for later retrieval. No programming or IT skills needed.

Running the formulas in the web server

If the formulas are calculated on the web server, the web page consists of two or more separate parts, a standard web page that is downloaded to the browser and one or more packages of programming code that reside on the server.


  • It is impossible to access the business formulas on the server.
  • Very large spreadsheets can be recalculated faster on a server.
  • Using modern AJAX technology, spreadsheet cells are still updated immediately, with a minimum of network communication between the browser and the web server.
  • Backend-integration is much easier, e.g to get the current interest rate for a mortgage calculator from a database or other real-time data source on or near the web server.
  • Web pages can be password protected, since the web server is only available to authenticated users.
  • The web page becomes smaller and can be downloaded faster, since it no longer contains the program code that calculates the cell formulas. This may also make it possible to use a complex spreadsheet with smaller devices like handheld computers or smartphones.


  • The web page can only be used with the kind of server environment it was created for, e.g. a web server capable of running Node.js code.
  • The web page can only be used online, with a connection to the server.
  • There is a theoretical upper limit to calculation performance, if the server has a very large number of simultaneous users.

What flavor of SpreadsheetConverter you select depends on your server environment:

  • Node.js can be enabled on almost all standard web servers. Node.js is free, open source technology.

SpreadsheetConverter Node.js

SpreadsheetConverter Node.js generates optimized JavaScript code for Node.js servers. SpreadsheetConverter HTML is included in SpreadsheetConverter Node.js.

Read more about the Node.js flavor.

Decide if you need the Standard or Professional edition.

Download and test SpreadsheetConverter for free for 30 days.

Explore prices and buying options.

Protecting your investment

Photo of an engineer studying a project plan on an iPad tablet

Many spreadsheets contain business-critical information. In the wrong hands, the same information can be used to create extensive damage to your business.

In our server-based flavors like Node.js, the formulas are executed directly on the web server, which makes them inaccessible to intruders. You can calculate your markups, interests or salary increases knowing that no-one can access the formulas or their values on the server.

More information

Still concerned about the difference between client-based and server-based calculations? Just interested in the technical details? No problem.

Read the technical details about client-based and server-based calculation here.