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I tried it and immediately fell in love! It was so easy to use! After a couple conversions I bought the guys a cup of coffee. A couple more and decided this was too good to abuse! I joined! My life is so much easier!


I had a huge, problematic file to convert that couldn't go through the usual automated conversion process. The Zamzar team responded quickly to my request for help, and they took the extra steps needed to do it manually.


Used it for over a year to convert my bank statements to csv files. Great quick app, increased my productivity a lot. Also, amazing support - always helped me quickly!

Agata Wierzbicka

I've used this product for years. And customer service is excellent. Just had an issue where I was charged and I didn't agree with the charge and they took care of it, even though they didn't have to.


I have been so thankful for Zamzar’s support from the beginning of the Pandemic to the present day. Their service is first rate & their helpfulness is always the best it could be.


A very useful and professional site. The service is easy to use and the administrators are helpful and courteous.

David Shelton

It’s my first time using it. I had some complications doing it. I’m not very good at this. But I wrote to the company and I had a lot of help. I’m satisfied with customer service and with the app.

Ana Suárez

I use Zamar whenever I need to convert audio and video files from multiple submitters to 1 uniform file format for Audio and Video Editing. I can do multiple large files in a short amount of time.

Christopher Bee

Great for when you need a lot of conversions in a short time. You have directly access and can even put the subscription on for just a month.

Sabina Calis

I feel like Zamzar is an active team member, especially for projects that I work on where I am the workhorse and it saves so much time and frustration. I am spoiled with Zamzar, because they have set the bar for file conversion and customer service very high.

Deborah Herman

Trusted by employees at these brands

Employees of some of the world’s most well-known brands rely on Zamzar to convert their files safely and efficiently, ensuring they have the formats they need for the job at hand. From global corporations and media companies, to respected educational establishments and newspaper publications, employees of these organisations trust Zamzar to provide the accurate and reliable conversion service they need.

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Your files are in safe hands

Zamzar has converted over 510 million files since 2006

For every 10,000 files converted on Zamzar, we'll plant a tree. By using Zamzar you are helping to make a difference to our planet

We're committed to regular charitable giving. Each month we donate at least 2% of our company profits to different charities

From your personal desktop to your business files, we've got you covered

We offer a range of tools, to help you convert your files in the most convenient way for you. As well as our online file conversion service, we also offer a desktop app for file conversions straight from your desktop, and an API for automated file conversions for developers. Which tool you use is up to you!

Want to convert files straight from your desktop?

Get the App

Fully integrated into your desktop

Convert over 150 different file formats

Convert documents, videos, audio files in one click

Need conversion functionality within your application?

Explore the API

One simple API to convert files

100s of formats for you to choose from

Documents, videos, audios, images & more...

Why choose Zamzar?

With Zamzar, file conversions are easy, reliable and convenient, so you can quickly convert your documents, images, videos, and more, to the formats you need. With faster downloads of converted files, and friendly and helpful support when you need it, you’ll have everything you need to work with your files.

We support almost every type of file format; if we don’t support one you need to convert, then drop us an email and we

Multiple File Formats

We support almost every type of file format; if we don’t support one you need to convert, then drop us an email and we'll look to get it added.

At Zamzar, we want you to have the best possible experience when converting your files, which is why we are completely ad-free.


At Zamzar, we want you to have the best possible experience when converting your files, which is why we are completely ad-free.

If you need a file converted quickly and securely, then you can rely on Zamzar to do just that.


If you need a file converted quickly and securely, then you can rely on Zamzar to do just that.

We know how important it is for you to be able convert your file at any time, which is why we are available every minute of every day, all year round.

Available 24*7

We know how important it is for you to be able convert your file at any time, which is why we are available every minute of every day, all year round.

Tools to suit your file conversion needs

You’ll find all the conversion and compression tools you need, all in one place, at Zamzar. With over 1100 file-conversion types supported, whether you need to convert videos, audio, documents or images, you’ll easily find what you need and soon have your files in the formats and sizing that work for you.

XLS Document Format

XLS Converter

The XLS format, also known as the Excel Binary File Format, is the format for spreadsheet files created by Microsoft or other spreadsheet programs. XLS files contain one or more worksheets that are made up of cells that are arranged by row and by column, and they allow users to do calculations by inserting formulas into cells. XLS files also support charts, images, pivot tables and more, and this means that they are often the format of choice for anyone doing any form of calculation or working with numerical data. This file format also allows users to create and record macros using a macro-programming language called Visual Basic.

XLS files are widely used in education and in work, although in 2007 they were replaced by the XLSX file format as the primary file type used for Excel spreadsheets.

Users can open XLS files with either Office for Windows or Office for Mac, and both these programs support features, including macros that have been written in Visual Basic. While applications like OpenOffice allow XLS files to be opened, some features may be limited. XLS files can also be opened on Android or iOS.

Related Tools

XLSX Document Format

XLSX Converter

XLSX is a Excel file type developed by Microsoft as part of Office 2007. XLSX was developed by Microsoft as part of their Office 2007 development which focused on trying to allow information to be more readily shared between different programs whilst also reducing the file size footprint which had been increasing year on year.

XLSX files have the same functionality as XLS files in that they can include shapes, charts, formula, macros and more. The difference between the two is more technical. The XLSX file data is stored in the Open XML format which stores data as separate files and is zipped to reduce space. This is compared to the XLS file type which stores the data in a single binary file. XLSX files can be opened by various programs including various OpenOffice programs and on the web with applications like Google Drive.

Related Tools

How to convert a XLS to a XLSX file?

  1. 1. Choose the XLS file that you want to convert.
  2. 2. Select XLSX as the the format you want to convert your XLS file to.
  3. 3. Click "Convert" to convert your XLS file.

Frequently asked questions

If you’ve got any questions about converting or compressing files with Zamzar, we’re happy to help! We’ve answered a few commonly-asked questions below, to get you started, and you can find out more information about file conversion and compression with Zamzar, in our Help centre.

XLS and XLSX are both Excel files, but XLSX is newer. It was introduced for Office 2007 and is now the standard. Zamzar is a quick way of converting XLS files into XLSX – just upload, convert, and download.

If you have Excel 2007 or later, you can open XLS files and save them into XLSX format. You may also be able to rename the file extension to .xlsx in File Explorer –make a copy first, just in case. However, Zamzar may be quicker if you don’t have Microsoft Office or don’t want to have to open or rename individual files.

XLS is an earlier version of XLSX, and XLS files can be opened in all versions of Office and can support macros. However, XLSX has been the standard Microsoft format since 2007, is more robust and tends to have a smaller file size – so if you don’t need support for macros then it may be the better choice.

It’s easy to convert between both formats by using an online conversion tool like Zamzar. Just upload one or more Excel spreadsheets, select to convert to either XLSX or XLS, and then download your new copy of the file.

One of the quickest ways to change an Excel file type without opening the file is to use an online conversion tool like Zamzar. Simply upload an XLS or XLSX file, and then convert it to the format you need, before downloading your new file.

Another way is to find the document in File Explorer and rename the file extension to .xlsx or .xls. However, it’s best to make a copy first before trying this method in case it affects the data in the file.

If you want to change an individual Excel file from XLS to XLSX, you can do this by opening the document in Excel and then saving it as an XLSX file. If you have more files to change, you may find it easier to use Zamzar or another online conversion tool. The tool on Zamzar’s website just has three steps – upload, convert and download. You don’t need to install extra software and you can convert multiple Excel files at the same time.

One of the quickest ways to change a workbook to XLSX is to use an online tool like the one on Zamzar’s website. You can convert multiple workbooks from older versions of Excel to XLSX in real time, without opening any files. Simply upload your XLS workbooks, select to convert them to XLSX, and then download the new files.

If you just have one file to change and you have Excel on your device, another method is to open an XLS workbook with Excel, and then use the ‘Save As’ menu option to convert it to XLSX.