Host Files in MailChimp

This feature requires Author user level or higher.

MailChimp offers free file hosting so you can share files with your subscribers without using traditional attachments. Quickly upload and link to hosted files right from the Campaign Builder, and then check your reports to see how many subscribers clicked on them.

Below, you'll learn about the benefits of hosting files in MailChimp, and how to upload and manage your files with the File Manager.

Types of Files You Can Upload

There's a 10MB limit for individual files in your MailChimp File Manager. Images in your campaign should be less than 1MB to help the files load quickly in subscribers' inboxes.

You can upload many file types to MailChimp, but we'll inspect each file and change extensions to reflect the original format if necessary. For example, if you're working with a PDF file type, but rename or save it using a JPG extension we'll detect the original file type and change it back to PDF automatically when the file is uploaded.

File Type Extensions
Text files .txt, .csv, .log, .css, .ics
Image files .jpg, .jpe, .jpeg, .gif, .png, .bmp, .psd, .tif, .tiff, .svg, .indd, .ai, .eps
Document files .doc, .docx, .rtf, .odt, .ott, .pdf, .pub, .pages, .mobi, .epub
Audio files .mp3, .m4a, .m4v, .wma, .ogg, .flac, .wav, .aif, .aifc, .aiff,
Video files .mp4, .mov, .avi, .mkv, .mpeg, .mpg, .wmv
Spreadsheet files .xls, .xlsx, .ods, .numbers
Presentation files .odp, .ppt, .pptx, .pps, .key
Archive files .zip, .tar, .gz, .7z, .vcf

Why MailChimp Doesn't Allow Attachments

Below are a few reasons why we don't allow attachments on campaigns sent through our servers.

  • Many ISPs and end-users block emails above a certain size. Attachments can increase the size of your email, raising the risk of your email getting blocked.
  • Most content and virus-scanning programs see attachments sent through any bulk mailing service as a potential security threat, and either block the attachment or the email entirely.
  • Attachments for large lists use a lot of bandwidth. Hosted files are less expensive and result in better delivery rates. Keeping our sending costs down allows us to be able to offer options like our Forever Free plan, and hosting files lets us provide you with tracking information.

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