Understanding Mailchimp's File Type Restrictions: A Comprehensive Guide
Mailchimp, a popular email marketing platform, supports a wide range of file types for uploads. However, it's not uncommon to encounter the message "We can't upload that file type" when attempting to upload certain files. This article aims to clarify Mailchimp's file type restrictions, helping you understand why this error occurs and how to resolve it.
Why Mailchimp Restricts Certain File Types
Mailchimp restricts certain file types to maintain the security and functionality of its platform. Some file types can pose security risks, while others may not be compatible with Mailchimp's email marketing features. Understanding these restrictions can help you avoid frustration and ensure your campaigns run smoothly.
Security Risks
Some file types, such as executable (.exe) files, can potentially harm your computer or contain malicious software. Mailchimp prohibits these to protect both your data and the platform's integrity.

Compatibility Issues
Other file types may not be compatible with Mailchimp's email marketing features. For instance, certain file types might not display correctly in email clients or could cause formatting issues. Mailchimp restricts these to ensure your campaigns look and function as intended.
Mailchimp's Supported File Types
Mailchimp supports a broad range of file types, including but not limited to:
- Images: JPG, PNG, GIF, BMP
- Documents: PDF, DOCX, XLSX, PPTX
- Audio: MP3, WAV, AAC
- Video: MP4, MOV, AVI
For a complete list of supported file types, you can refer to Mailchimp's official documentation.

Resolving "We Can't Upload That File Type" Error
If you're encountering the "We can't upload that file type" error, here are some steps you can take to resolve the issue:
Check the File Type
First, ensure that the file type you're trying to upload is supported by Mailchimp. If it's not, you may need to convert the file to a supported format.
Convert the File
If the file type is supported but you're still encountering the error, try converting the file to a different format. For example, you can convert a DOC file to DOCX or a PDF to a different format. There are numerous free online tools available for file conversion.
Check the File Size
Mailchimp has file size limits for uploads. If your file is too large, you may need to compress it or reduce its size before uploading. Mailchimp's file size limits vary depending on the file type, so be sure to check the specific limits for your file type.
Best Practices for Uploading Files to Mailchimp
To avoid encountering the "We can't upload that file type" error, follow these best practices when uploading files to Mailchimp:
- Always check Mailchimp's supported file types before uploading.
- Compress large files to reduce their size and improve upload times.
- Use standard file formats whenever possible.
- Test your campaigns thoroughly to ensure all files display and function correctly.
By following these best practices, you can minimize the risk of encountering file type errors and ensure your Mailchimp campaigns run smoothly.
Conclusion
Mailchimp's file type restrictions are in place to maintain the security and functionality of its platform. Understanding these restrictions and following best practices for file uploads can help you avoid errors and ensure your email marketing campaigns are successful. If you're still encountering issues, don't hesitate to reach out to Mailchimp's support team for further assistance.