---
title: What should I do if the uploaded .csv file is not supported?
description: Fix unsupported CSV file errors in FreJun. Learn correct CSV formatting, phone number standards, and use sample templates for seamless uploads.
---

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# What should I do if the uploaded .csv file is not supported?

## Learn how to fix CSV formatting issues, validate phone numbers, and successfully upload contact files into FreJun without errors.

Uploading contacts in bulk helps teams save time, but CSV upload errors can slow you down. If [FreJun](http://frejun.com)does not support your uploaded CSV file, it usually indicates a formatting mismatch, unsupported file type, or incorrect phone number structure.

This guide explains **why CSV uploads fail**, how to **fix common issues**, and how to use FreJun’s **pre-formatted sample CSV** to ensure smooth data imports for calling campaigns, CRM sync, and team outreach.

### If your uploaded `.csv` file is not supported in FreJun, it usually means there’s a formatting issue.

#### Check the File Format

- Make sure the file is saved as Comma-Separated Values (.csv) — not Excel (.xlsx) or another format.
  
    - In Excel or Google Sheets:  
      Click File \> Download \> Comma-separated values (.csv)
- #### Verify Phone Number Formatting
  
    - Use the international format with the country code

To avoid guesswork, you can download and follow a pre-formatted sample CSV file by [clicking here](https://docs.google.com/spreadsheets/d/1O1GTS1rAoHemFyLA8Tt5-Oq8Cyp2GseuQ3lUItT9n8g/edit?usp=sharing). 

This ensures your data structure meets all required fields and formatting standards for a seamless upload.

For more Queries, reach out to us at support@frejun.com or Live chat support through your FreJun Account  
[Sign up](https://product.frejun.com/signup) with FreJun to know more about it 

 

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