--- title: How to upload a file of contacts to MXT description: SMS Global Knowledgebase --- [![](https://cdn.craft.cloud/ff00d28e-6061-427e-b58d-8267ebeaad6b/builds/a173c27c-7ed2-40a3-b553-3262aea64d9e/artifacts/dist/img/logo/sms-global-logo.svg)](https://smsglobal.com?hsLang=en-au) smsglobal.com [Talk to an expert](https://www.smsglobal.com/contact?hsLang=en-au) Talk to an expert [Skip to content](https://hs.smsglobal.com/how-to-upload-a-file-of-contacts-to-mxt-smsglobal-help-center#main-content) [![SMSGLOBAL LOGO WHITE-2](https://hs.smsglobal.com/hs-fs/hubfs/SMSGLOBAL%20LOGO%20WHITE-2.png?width=500&height=100&name=SMSGLOBAL%20LOGO%20WHITE-2.png)](https://www.smsglobal.com/?hsLang=en-au) Open main navigation Close main navigation - [Contact us](https://www.smsglobal.com/contact/) [Contact us](https://www.smsglobal.com/contact/?hsLang=en-au) Advice and answers from the SMSGlobal Team - There are no suggestions because the search field is empty. 1. 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If the first row of your excel document contains headings, tick the box next to ***‘The first row contains headings’***. **Note:** This file must be a **CSV (Comma Delimited)** file. **XLSX and XLS** is not a supported format for uploading. **Tip:** Make sure this file is formatted correctly and contains the relevant country prefixes. For information on how to do this, see: [How to format a contact list for MXT in excel](https://hs.smsglobal.com/how-to-format-an-excel-spreadsheet-smsglobal-help-center?hsLang=en-au). [![](https://hs.smsglobal.com/hubfs/Knowledge%20Base%20Import/Uploading_Contact_File_MXT_Part1.gif)](https://downloads.intercomcdn.com/i/o/339324266/2431f19a69c041de730465f5/Uploading_Contact_File_MXT_Part1.gif?expires=1768788900&signature=8626e7bec366d183d747a09d679acf5d57132b0f84fbc573c9faf9cacd84b9c8&req=dyMuFct6n4dZFb4f3HP0gDJGuhX0YKe4viHd%2BwNkf81e3JCZFpcQya61q8%2FK%0AEjenrPsxZHJrVQFHnA%3D%3D%0A) **4.** In the dropdown box next to ***‘Import To’***, select which contact group you would like to import the contact list to. **Note:** If you would like us to automatically remove any contacts that have previously opted out of your SMS campaigns, tick the option ***'Exclude opted out numbers from being uploaded in the contact group'***. This will prevent these previously opted out contacts from being uploaded. **5.** Click ***'Next'*** to see a preview of your file contents. Using the drop-down boxes, select the column that contains the information relevant to each heading. **Note:** You can choose to leave any number of these fields blank, as long as at least the mobile number column is specified. **6.** Click ***'Next'*** to continue. Your data is now ready to import. Read over your content to ensure your spreadsheet column mapping is correct. **Note:** it can take up to several minutes to import large spreadsheets of data. **7.** Select ***‘Import’*** once you have reviewed the date to start the import process. 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